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2019-2020年中考数学模拟试卷（四）(I)一．仔细选一选（本题有10个小题，每小题3分，共30分）下面每小题给出的四个选项中，只有一个是正确的，请把正确选项前的字母在答题卡中相应的方框内涂黑．注意可以用多种不同的方法来选取正确答案．1．下列图形中，既是轴对称图形又是中心对称图形的是（）A．正五边形B．正方形C．平行四边形D．正三角形2．下列各式中，计算结果为a6的是（）A．a3+a3B．a7﹣a C．a2•a3 D．a12÷a63．用配方法解方程：x2﹣4x+1=0，下列配方正确的是（）A．（x﹣2）2=3 B．（x+2）2﹣3=0 C．（x﹣2）2=0 D．x（x﹣4）=﹣14．已知一组数据x1，x2，x3的平均数和方差分别为5和2，则数据x1+1，x2+1，x3+1的平均数和方差分别是（）A．5和2 B．6和2 C．5和3 D．6和35．若二次函数y=ax2﹣2x+a2﹣4（a为常数）的图象经过原点，则该图象的对称轴是直线（）A．x=1或x=﹣1 B．x=1 C．x=或x=﹣D．x=6．如图，从位于六和塔的观测点C测得两建筑物底部A，B的俯角分别为45°和60°．若此观测点离地面的高度CD为30米，A，B两点在CD的两侧，且点A，D，B在同一水平直线上，则A，B之间的距离为（）米．A．30+10 B．40 C．45 D．30+157．如图，在梯形ABCD中，已知AD∥BC，梯形各边长为：AB=6，BC=9，CD=4，DA=3，分别以AB、CD为直径作圆，则这两圆的位置关系是（）A．内切 B．相交 C．外离 D．外切8．把5个大小、质地相同的球，分别标号为1，1，2，3，4，放入袋中，随机取出一个小球后不放回，再随机地取出一个小球，则第二次取出小球标号大于第一次取出小球标号的概率是（）A． B． C． D．9．如图，正方形ABCD中，点O是对角线AC的中点，点P是线段AO上的动点（不与点A、O重合），连结PB，作PE⊥PB交CD于点E．以下结论：①△PBC≌△PDC；②∠PDE=∠PED；③PC﹣PA=CE．其中正确的有（）个．A．0 B．1 C．2 D．310．将直线l1：y=x和直线l2：y=2x+1及x轴围成的三角形面积记为S1，直线l2：y=2x+1和直线l3：y=3x+2及x轴围成的三角形面积记为S2，…，以此类推，直线l n：y=nx+n﹣1和直线l n+1：y=（n+1）x+n及x轴围成的三角形面积记为S n，记W=S1+S2+…+S n，当n越来越大时，你猜想W最接近的常数是（）A． B． C． D．二．认真填一填（本题有6个小题，每小题4分，共24分）要注意认真看清题目的条件和要填写的内容，尽量完整地填写答案．11．计算×+=．12．已知一个圆柱的侧面展开图是如图所示的矩形，长为6π，宽为4π，那么这个圆柱底面圆的半径为．13．不等式组的整数解是．14．如图，在边长为4的正三角形ABC中，BD=1，∠BAD=∠CDE，则AE的长为．15．已知一个直角三角形的一边长等于另一边长的2倍，那么这个直角三角形中较小锐角的正切值为．16．如图，点P是反比例函数y=（x＞0）的图象上任意一点，PA⊥x轴于A，PD⊥y轴于点D，分别交反比例函数y=（x＞0，0＜k＜6）的图象于点B，C．下列结论：①当k=3时，BC是△PAD的中位线；②0＜k＜6中的任何一个k值，都使得△PDA∽△PCB；③当四边形ABCD的面积等于2时，k＜3；④当点P的坐标为（3，2）时，存在这样的k，使得将△PCB沿CB对折后，P点恰好落在OA上．其中正确结论的编号是．三．全面答一答（本题有7个小题，共66分）解答应写出文字说明，证明过程或推演步骤．如果觉得有的题目有点困难，那么把自己能写出的解答写出一部分也可以．17．（1）求多项式ax2﹣a与多项式x2﹣2x+1的公因式；（2）已知关于x的分式方程=3的解是正数，求m的取值范围．18．xx年5月某日，浙江省11个城市的空气质量指数（AQI）如图所示：（1）这11个城市当天的空气质量指数的众数是；中位数是；（2）当0≤AQI≤50时，空气质量为优．若在这11个城市中随机抽取一个，求抽到的城市这一天空气质量为优的概率；（3）求杭州、宁波、嘉兴、温州、湖州五个城市当天的空气质量指数的平均数．19．如图，已知圆上两点A、B．（1）用直尺和圆规作以AB为底边的圆内接等腰三角形（不写画法，保留痕迹）；（2）若已知圆的半径R=5，AB=8，求所作等腰三角形底边上的高．20．如图，在△ABC中，D是BC边上的一点，过A点作BC的平行线，截取AE=BD，连结EB，连结EC交AD于点F．（1）证明：当点F是AD的中点时，点D是BC的中点；（2）证明：当点D是AB的中垂线与BC的交点时，四边形AEBD是菱形．21．如图，已知Rt△ABC的两条直角边，AC=6，BC=8，点D是BC边上的点，过D作DE⊥AB 于E，点F是AC边上的动点，连结DF，EF，以DF、EF为邻边构造▱DFEG：（1）证明：△DBE∽△ABC；（2）设CD长为a（0＜a＜8），用含a的代数式表示DE；（3）若CD=4时，□DFEG的顶点G恰好落在BC所在直线上，求出此时AF的长．22．（1）已知二次函数y=x2﹣2bx+c的图象与x轴只有一个交点：①b、c的关系式为；②设直线y=9与该抛物线的交点为A、B，则|AB|=；③若该抛物线上有两个点C（m，n）、D（m+4，n），求|CD|及n的值．（2）若二次函数y=x2﹣2bx+c的图象与x轴有两个交点E（5，0）、F（k，0），且线段EF（含端点）上有若干个横坐标为整数的点，这些整数之和为18：①b、c的关系式为；②k的取值范围是；当k为整数时，b=．23．如图，在平面直角坐标系中，Rt△ABO的斜边OA在x轴上，点B在第一象限内，AO=4，∠BOA=30°．点C（t，0）是x轴正半轴上一动点（t＞0且t≠4）：（1）点B的坐标为；过点O、B、A的抛物线解析式为；（2）作△OBC的外接圆⊙P，当圆心P在（1）中抛物线上时，求点C和圆心P的坐标；（3）设△OBC的外接圆⊙P与y轴的另一交点为D，请将OD用含t的代数式表示出来，并求CD的最小值．xx年浙江省杭州市桐庐县三校共同体中考数学模拟试卷（四）参考答案与试题解析一．仔细选一选（本题有10个小题，每小题3分，共30分）下面每小题给出的四个选项中，只有一个是正确的，请把正确选项前的字母在答题卡中相应的方框内涂黑．注意可以用多种不同的方法来选取正确答案．1．下列图形中，既是轴对称图形又是中心对称图形的是（）A．正五边形B．正方形C．平行四边形D．正三角形【考点】中心对称图形；轴对称图形．【分析】根据轴对称图形与中心对称图形的概念求解．【解答】解：A、是轴对称图形，不是中心对称图形．故错误；B、是轴对称图形，也是中心对称图形．故正确；C、不是轴对称图形，是中心对称图形．故错误；D、是轴对称图形，不是中心对称图形．故错误．故选B．【点评】本题考查了中心对称图形与轴对称图形的概念：轴对称图形的关键是寻找对称轴，图形两部分沿对称轴折叠后可重合；中心对称图形是要寻找对称中心，旋转180度后与原图重合．2．下列各式中，计算结果为a6的是（）A．a3+a3B．a7﹣a C．a2•a3 D．a12÷a6【考点】同底数幂的除法；合并同类项；同底数幂的乘法．【专题】计算题．【分析】A、原式合并得到结果，即可做出判断；B、原式不能合并，错误；C、原式利用同底数幂的乘法法则计算得到结果，即可做出判断；D、原式利用同底数幂的除法法则计算得到结果，即可做出判断．【解答】解：A、原式=2a3，错误；B、原式不能合并，错误；C、原式=a5，错误；D、原式=a6，正确．故选D．【点评】此题考查了同底数幂的乘除法，以及合并同类项，熟练掌握运算法则是解本题的关键．3．用配方法解方程：x2﹣4x+1=0，下列配方正确的是（）A．（x﹣2）2=3 B．（x+2）2﹣3=0 C．（x﹣2）2=0 D．x（x﹣4）=﹣1【考点】解一元二次方程-配方法．【分析】把常数项1移项后，应该在左右两边同时加上一次项系数﹣4的一半的平方．【解答】解：x2﹣4x+1=0，移项，得x2﹣4x=﹣1，配方，得x2﹣4x+4=﹣1+4，（x﹣2）2=3．故选：A．【点评】本题考查了用配方法解一元二次方程的应用，解此题的关键是能正确配方，即方程两边都加上一次项系数一半的平方（当二次项系数为1时）．4．已知一组数据x1，x2，x3的平均数和方差分别为5和2，则数据x1+1，x2+1，x3+1的平均数和方差分别是（）A．5和2 B．6和2 C．5和3 D．6和3【考点】方差；算术平均数．【专题】计算题．【分析】由于数据x1+1，x2+1，x3+1的每个数比原数据大1，则新数据的平均数比原数据的平均数大1；由于新数据的波动性没有变，所以新数据的方差与原数据的方差相同．【解答】解：∵数据x1，x2，x3的平均数为5，∴数据x1+1，x2+1，x3+1的平均数为6，∵数据x1，x2，x3的方差为2，∴数据x1+1，x2+1，x3+1的方差为2．故选B．【点评】本题考查了方差：方差是反映一组数据的波动大小的一个量．方差越大，则平均值的离散程度越大，稳定性也越小；反之，则它与其平均值的离散程度越小，稳定性越好．也考查了算术平均数．5．若二次函数y=ax2﹣2x+a2﹣4（a为常数）的图象经过原点，则该图象的对称轴是直线（）A．x=1或x=﹣1 B．x=1 C．x=或x=﹣D．x=【考点】二次函数的性质．【分析】根据图象可以知道图象经过点（0，0），因而把这个点代入记得到一个关于a的方程，就可以求出a的值，从而根据对称轴方程求得对称轴即可．【解答】解：把原点（0，0）代入抛物线解析式，得a2﹣4=0，解得a=±2，∴二次函数y=2x2﹣2x或二次函数y=﹣2x2﹣2x，∴对称轴为：x=﹣=±，故选C．【点评】本题考查了二次函数图象上的点的坐标，根据对于函数图象的描述能够理解函数的解析式的特点，是解决本题的关键．6．如图，从位于六和塔的观测点C测得两建筑物底部A，B的俯角分别为45°和60°．若此观测点离地面的高度CD为30米，A，B两点在CD的两侧，且点A，D，B在同一水平直线上，则A，B之间的距离为（）米．A．30+10 B．40 C．45 D．30+15【考点】解直角三角形的应用-仰角俯角问题．【分析】在Rt△ACD和Rt△CDB中分别求出AD，BD的长度，然后根据AB=AD+BD即可求出AB的值．【解答】解：由题意得，∠ECA=45°，∠FCB=60°，∵EF∥AB，∴∠CAD=∠ECA=45°，∠CBD=∠FCB=60°，∵∠ACD=∠CAD=45°，在Rt△CDB中，tan∠CBD=，∴BD==10米，∵AD=CD=30米，∴AB=AD+BD=30+10米，故选A．【点评】本题考查了解直角三角形的应用，解答本题的关键是根据俯角构造直角三角形，并利用解直角三角形的知识解直角的三角形．7．如图，在梯形ABCD中，已知AD∥BC，梯形各边长为：AB=6，BC=9，CD=4，DA=3，分别以AB、CD为直径作圆，则这两圆的位置关系是（）A．内切 B．相交 C．外离 D．外切【考点】圆与圆的位置关系．【分析】求得梯形的中位线为两圆的圆心距，AB和CD的一半为两圆的半径，利用半径之和和两圆的圆心距的大小关系求解．【解答】解：∵AD=3，BC=9，∴两圆的圆心距为=6，∵AB=6，CD=4，∴两圆的半径分别为3和2，∵2+3＜6，∴两圆外离，故选C．【点评】本题考查了圆与圆的位置关系，解题的关键是分别求得两圆的圆心距和两圆的半径，难度不大．8．把5个大小、质地相同的球，分别标号为1，1，2，3，4，放入袋中，随机取出一个小球后不放回，再随机地取出一个小球，则第二次取出小球标号大于第一次取出小球标号的概率是（）A． B． C． D．【考点】列表法与树状图法．【分析】首先根据题意画出树状图，然后由树状图求得所有等可能的结果与第二次取出小球标号大于第一次取出小球标号的情况，再利用概率公式即可求得答案．【解答】解：画树状图得：∵共有20种等可能的结果，第二次取出小球标号大于第一次取出小球标号的有9种情况，∴第二次取出小球标号大于第一次取出小球标号的概率为：．故选D．【点评】此题考查的是用列表法或树状图法求概率．注意树状图法与列表法可以不重复不遗漏的列出所有可能的结果，列表法适合于两步完成的事件；树状图法适合两步或两步以上完成的事件；解题时要注意此题是放回实验还是不放回实验；注意概率=所求情况数与总情况数之比．9．如图，正方形ABCD中，点O是对角线AC的中点，点P是线段AO上的动点（不与点A、O重合），连结PB，作PE⊥PB交CD于点E．以下结论：①△PBC≌△PDC；②∠PDE=∠PED；③PC﹣PA=CE．其中正确的有（）个．A．0 B．1 C．2 D．3【考点】全等三角形的判定与性质；正方形的性质．【分析】由正方形的性质得出BC=DC，∠BCP=∠DCP，由SAS即可证明△PBC≌△PDC，得出①正确；由三角形全等得出∠PBC=∠PDE，PB=PD，再证出∠PBC=∠PED，得出∠PDE=∠PED，②正确；证出PD=PE，得出DF=EF，作PH⊥AD于H，PF⊥CD于F，由等腰直角三角形得出PA=EF，PC=CF，即可得出③正确．【解答】解：∵四边形ABCD是正方形，∴BC=DC，∠BCP=∠DCP，在△PBC和△PDC中，，∴△PBC≌△PDC（SAS）∴①正确；∴∠PBC=∠PDE，PB=PD，∵PB⊥PE，∠BCD=90°，∴∠PBC+∠PEC=360°﹣∠BPE﹣∠BCE=180°∵∠PEC+∠PED=180°，∴∠PBC=∠PED，∴∠PDE=∠PED，∴②正确；∴PD=PE，∵PF⊥CD，∴DF=EF；作PH⊥AD于点H，PF⊥CD于F，如图所示：则PA=PH=DF=EF，PC=CF，∴PC﹣PA=（CF﹣EF），即PC﹣PA=CE，∴③正确；正确的个数有3个；故选：D．【点评】本题考查了正方形的性质、全等三角形的判定与性质、等腰三角形的判定与性质、三角函数；本题有一定难度，特别是③中，需要作辅助线运用三角函数才能得出结果．10．将直线l1：y=x和直线l2：y=2x+1及x轴围成的三角形面积记为S1，直线l2：y=2x+1和直线l3：y=3x+2及x轴围成的三角形面积记为S2，…，以此类推，直线l n：y=nx+n﹣1和直线l n+1：y=（n+1）x+n及x轴围成的三角形面积记为S n，记W=S1+S2+…+S n，当n越来越大时，你猜想W最接近的常数是（）A． B． C． D．【考点】两条直线相交或平行问题．【专题】规律型．【分析】根据题意列出方程组，解出x，y的值，可知无论k取何值，直线l1与l2的交点均为定点，再求出y=nx+n﹣1与x轴的交点和y=（n+1）x+n与x轴的交点坐标，再根据三角形面积公式求出S n，根据公式可求出S1、s2、s3、…，然后可求得w的表达式，从而可猜想出W最接近的常数的值．【解答】解：将y=nx+n﹣1和y=（n+1）x+n联立得：解得：∴无论k取何值，直线l n和直线l 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n=+…+）=（1﹣+﹣+…+）=（1﹣）=当n越来越大时，越来越接近与1．∴越来越接近于∴w越来越接近于．【点评】此题考查了一次函数的综合题；解题的关键是一次函数的图象与两坐标轴的交点坐标特点，与x轴的交点的纵坐标为0，与y轴的交点的横坐标为0．二．认真填一填（本题有6个小题，每小题4分，共24分）要注意认真看清题目的条件和要填写的内容，尽量完整地填写答案．11．计算×+=4．【考点】实数的运算．【分析】利用二次根式的性质以及三次根式的性质化简求出即可．【解答】解：×+=﹣2=6﹣2=4．故答案为：4．【点评】此题主要考查了二次根式的性质和三次根式的性质等知识，正确化简各数是解题关键．12．已知一个圆柱的侧面展开图是如图所示的矩形，长为6π，宽为4π，那么这个圆柱底面圆的半径为2或3．【考点】几何体的展开图．【分析】分底面周长为4π和6π两种情况讨论，求得底面半径．【解答】解：①底面周长为4π时，圆柱底面圆的半径为4π÷π÷2=2；②底面周长为6π时，圆柱底面圆的半径为6π÷π÷2=1．故答案为：2或3．【点评】考查了圆柱的侧面展开图，注意分长为底面周长和宽为底面周长两种情况讨论求解．13．不等式组的整数解是﹣1、0、1．【考点】一元一次不等式组的整数解．【分析】先求出不等式组中每个不等式的解集，然后求出其公共解集，最后求其整数解即可．【解答】解：，解①得：x＞﹣，解②得：x＜．则不等式组的解集是：﹣，则不等式组的整数解是：﹣1、0、1．故答案是：﹣1、0、1．【点评】本题考查不等式组的解法及整数解的确定．求不等式组的解集，应遵循以下原则：同大取较大，同小取较小，小大大小中间找，大大小小解不了．14．如图，在边长为4的正三角形ABC中，BD=1，∠BAD=∠CDE，则AE的长为．【考点】相似三角形的判定与性质；等边三角形的性质．【专题】计算题．【分析】先根据等边三角形的性质得∠B=∠C=60°，AB=BC=AC=4，则CD=BC﹣BD=3，再根据有两组角对应相等的两三角形相似可判断△ABD∽△DCE，利用相似比计算出CE=，然后利用AE=AC﹣CE进行计算即可．【解答】解：∵△ABC为边长为4的等边三角形，∴∠B=∠C=60°，AB=BC=AC=4，∴CD=BC﹣BD=4﹣1=3，∵∠BAD=∠CDE，∠B=∠C，∴△ABD∽△DCE，∴=，即=，∴CE=，∴AE=AC﹣CE=4﹣=．故答案为．【点评】本题考查了相似三角形的判定与性质：在判定两个三角形相似时，应注意利用图形中已有的公共角、公共边等隐含条件，以充分发挥基本图形的作用，寻找相似三角形的一般方法是通过作平行线构造相似三角形；在利用三角形相似的性质时，通过相似比计算相应边的长．15．已知一个直角三角形的一边长等于另一边长的2倍，那么这个直角三角形中较小锐角的正切值为．【考点】锐角三角函数的定义；勾股定理．【专题】分类讨论．【分析】根据题意，分两种情况：（1）当直角三角形的斜边等于一条直角边的长度的2倍时；（2）当直角三角形的一条直角边的长度等于另一条直角边的长度的2倍时；然后根据一个角的正切值的求法，求出这个直角三角形中较小锐角的正切值为多少即可．【解答】解：（1）当直角三角形的斜边等于一条直角边的长度的2倍时，设直角三角形的斜边等于2，则一条直角边的长度等于1，∴另一条直角边的长度是：，∴这个直角三角形中较小锐角的正切值为：1÷．（2）当直角三角形的一条直角边的长度等于另一条直角边的长度的2倍时，设一条直角边的长度等于1，则一条直角边的长度等于2，∴这个直角三角形中较小锐角的正切值为：1÷2=．故答案为：．【点评】（1）此题主要考查了锐角三角函数的定义，要熟练掌握，解答此题的关键是要明确：锐角A的正弦、余弦、正切都叫做∠A的锐角三角函数．（2）此题还考查了勾股定理的应用，以及分类讨论思想的应用，要熟练掌握．16．如图，点P是反比例函数y=（x＞0）的图象上任意一点，PA⊥x轴于A，PD⊥y轴于点D，分别交反比例函数y=（x＞0，0＜k＜6）的图象于点B，C．下列结论：①当k=3时，BC是△PAD的中位线；②0＜k＜6中的任何一个k值，都使得△PDA∽△PCB；③当四边形ABCD的面积等于2时，k＜3；④当点P的坐标为（3，2）时，存在这样的k，使得将△PCB沿CB对折后，P点恰好落在OA上．其中正确结论的编号是①②③④．【考点】反比例函数综合题．【分析】①设点P的坐标为（m，），然后再求得点C和点B的坐标，从而得出DC=CP，PB=BA；②按照①的方法先求得点C和点B的坐标，从而得出；③先求得△PDA的面积，然后再求得△PCB的面积，根据相似三角形的面积等于相似比的平方，求得△PDA与△PCB的相似比，从而可求得k值；④先求得AD的解析式，然后可求得EP的解析式，从而可求得点E的坐标，然后再求得AB、BE的长度，最后在直角三角形ABE中由勾股定理可求得k的值．【解答】解：①设点p的坐标为（m，），则PD=m，PA=，将x=m代入y=得：y=，∴AB=PA，将y=代入y=得：x=，∴DC=PD，∴当k=3时，BC是△PAD的中位线，故①正确；②设点p的坐标为（m，），PD=m，PA=，将x=m代入y=得：y=，∴PB=﹣=，将y=代入y=得：x=，∴PC=m﹣=，∴=，=，∴，∴△PDA∽△PCB，故②正确；③∵点P的坐标为（3，2），∴△PDA的面积=3，∵四边形ABCD的面积等于2，∴△PBC的面积=1，∴S△PBC：S△PDA=1：3，∴△PBC与△PDA的相似比为：3，∴，解得：k=6﹣2，∵6﹣3＜3，∴k＜3，故③正确；④如下图所示：∵点P的坐标为（3，2），∴D（0，2）、A（3，0），∴直线AD的解析式为y=+2，∵直线PE⊥AD，∴设直线PE的解析式为y=x+b，将P（3，2）代入得：b=﹣，∴直线PE的解析式为y=x﹣，令y=0得：x=，∴AE=．将x=3代入y=得：y=，∴AB=，PB=2﹣，由轴对称的性质可知：BE=PB=2﹣，在直角△ABE中，由勾股定理得：AE2+AB2=BE2即：，解得：k=，故④正确．故答案为：①②③④．【点评】本题主要考查的是反比例函数，一次函数、勾股定理以及轴对称图形的性质的综合应用，难度较大，熟练掌握相关知识是解题的关键．三．全面答一答（本题有7个小题，共66分）解答应写出文字说明，证明过程或推演步骤．如果觉得有的题目有点困难，那么把自己能写出的解答写出一部分也可以．17．（1）求多项式ax2﹣a与多项式x2﹣2x+1的公因式；（2）已知关于x的分式方程=3的解是正数，求m的取值范围．【考点】分式方程的解；公因式．【专题】计算题．【分析】（1）两多项式分解因式后，找出公因式即可；（2）分式方程去分母转化为整式方程，求出整式方程的解表示出解，根据解为正数求出m 的范围即可．【解答】解：（1）先分解因式：ax2﹣a=a（x+1）（x﹣1），x2﹣2x+1=（x﹣1）2，∴公因式是x﹣1；（2）去分母得：2x+m=3x﹣3，解得：x=m+3，根据题意得：m+3＞0，∴m＞﹣3，∵x=m+3=1是增根，∴m=﹣2时无解，∴m＞﹣3且m≠﹣2．【点评】此题考查了分式方程的解，以及公因式，需注意在任何时候都要考虑分母不为0．18．xx年5月某日，浙江省11个城市的空气质量指数（AQI）如图所示：（1）这11个城市当天的空气质量指数的众数是60；中位数是55；（2）当0≤AQI≤50时，空气质量为优．若在这11个城市中随机抽取一个，求抽到的城市这一天空气质量为优的概率；（3）求杭州、宁波、嘉兴、温州、湖州五个城市当天的空气质量指数的平均数．【考点】众数；条形统计图；算术平均数；中位数；概率公式．【分析】（1）根据众数是一组数据中出现次数最多的数据叫做众数；中位数：将一组数据按照从小到大（或从大到小）的顺序排列，如果数据的个数是奇数，则处于中间位置的数就是这组数据的中位数．如果这组数据的个数是偶数，则中间两个数据的平均数就是这组数据的中位数可得答案；（2）从条形统计图中找出这11个城市当天的空气质量为优的城市个数，再除以城市总数即可；（3）根据平均数的计算方法进行计算即可．【解答】解：（1）将11个数据按从小到大的顺序排列为：37，42，43，49，52，55，60，60，63，75，80，60出现了两次，次数最多，所以众数是60，第6个数是55，所以中位数是55．故答案为60，55；（2）∵当0≤AQI≤50时，空气质量为优，由图可知，这11个城市中当天的空气质量为优的有4个，∴若在这11个城市中随机抽取一个，抽到的城市这一天空气质量为优的概率为；（3）杭州、宁波、嘉兴、温州、湖州五个城市当天的空气质量指数的平均数为：（75+63+60+80+52）÷5=66．【点评】此题主要考查了条形统计图，众数、中位数、平均数的定义以及概率公式，读懂统计图，从不同的统计图中得到必要的信息是解决问题的关键．条形统计图能清楚地表示出每个项目的数据．概率=所求情况数与总情况数之比．19．如图，已知圆上两点A、B．（1）用直尺和圆规作以AB为底边的圆内接等腰三角形（不写画法，保留痕迹）；（2）若已知圆的半径R=5，AB=8，求所作等腰三角形底边上的高．【考点】作图—复杂作图；等腰三角形的性质；垂径定理．【分析】（1）作AB的垂直平分线与圆相交于一点，分别与A、B连接即可得到以AB为底边的圆内接等腰三角形；（2）连结OA，先根据垂径定理得到AD的长，再根据勾股定理，以及线段的和差关系即可求解．【解答】解：（1）如图所示：△ABC即为所求．（2）连结OA，∵圆的半径R=5，AB=8，∴OA=OC=5，AD=4，在△AOD中，OD==3，∴CD=OC+OD=5+3=8．故所作等腰三角形底边上的高是8．【点评】本题考查了复杂作图，主要利用了线段垂直平分线的作法，等腰三角形的性质，以及垂径定理．20．如图，在△ABC中，D是BC边上的一点，过A点作BC的平行线，截取AE=BD，连结EB，连结EC交AD于点F．（1）证明：当点F是AD的中点时，点D是BC的中点；（2）证明：当点D是AB的中垂线与BC的交点时，四边形AEBD是菱形．【考点】菱形的判定；全等三角形的判定与性质．【分析】（1）证得△EAF≌△CDF后即可得到DC=AE，然后根据AE=BD得到BD=DC；（2）首先利用一组对边相等且平行的四边形为平行四边形证得平行四边形，然后根据中垂线的性质得到BD=AD，从而利用邻边相等的平行四边形是菱形进行判定即可．【解答】证明：（1）∵AE∥BC，∴∠EAF=∠CDF，又∵F是AD的中点，∴AF=DF，∴∴△EAF≌△CDF，∴DC=AE，∵AE=BD，∴BD=DC；（2）∵AE=BD且AE∥BD，∴四边形AEBD是平行四边形，又∵点D是AB的中垂线与BC的交点，则有BD=AD，∴平行四边形AEBD一组邻边相等，∴四边形AEBD是菱形．【点评】本题考查了菱形的判定及全等三角形的判定与性质，解题的关键是了解菱形的几种判定方法，难度不大．21．如图，已知Rt△ABC的两条直角边，AC=6，BC=8，点D是BC边上的点，过D作DE⊥AB 于E，点F是AC边上的动点，连结DF，EF，以DF、EF为邻边构造▱DFEG：（1）证明：△DBE∽△ABC；（2）设CD长为a（0＜a＜8），用含a的代数式表示DE；（3）若CD=4时，□DFEG的顶点G恰好落在BC所在直线上，求出此时AF的长．【考点】相似形综合题．【分析】（1）由DE⊥AB，得到∠BED=90°，于是得到∠BED=∠C=90°，由于∠B=∠B，即可证得△DBE∽△ABC；（2）解：在直角三角形ABC中，根据勾股定理求得AB==10，由△DBE∽△ABC，得到，解方程，即可得到结果；（3）如图，顶点G落在BC所在直线上，由四边形DFEG是平行四边形，得到GD∥EF，证得△ABC∽△AFE，得到，代入数值即可得到结果．【解答】（1）证明：∵DE⊥AB，∴∠BED=90°，∴∠BED=∠C=90°，∵∠B=∠B，∴△DBE∽△ABC；（2）解：在直角三角形ABC中，∵AC=6，BC=8，∴AB==10，由（1）知，△DBE∽△ABC，∴，即，∴DE=（3）如图，顶点G落在BC所在直线上，∵四边形DFEG是平行四边形，∴GD∥EF，∴△ABC∽△AFE，∴，∵CD=a=4，∴DE==，∵BC=8，∴BD=4，∴BE==，∴AE=10﹣=，∴AF==．【点评】本题考查了相似三角形的判定和性质，勾股定理，平行四边形的性质，熟练掌握定理是解题的关键．22．（1）已知二次函数y=x2﹣2bx+c的图象与x轴只有一个交点：①b、c的关系式为b2=c；②设直线y=9与该抛物线的交点为A、B，则|AB|=6；③若该抛物线上有两个点C（m，n）、D（m+4，n），求|CD|及n的值．（2）若二次函数y=x2﹣2bx+c的图象与x轴有两个交点E（5，0）、F（k，0），且线段EF（含端点）上有若干个横坐标为整数的点，这些整数之和为18：①b、c的关系式为c=10b﹣25；②k的取值范围是7≤k＜8；当k为整数时，b=6．【考点】抛物线与x轴的交点；二次函数图象上点的坐标特征．【分析】（1）①根据二次函数的图象与x轴只有一个交点，则（2b）2﹣4c=0，由此可得到b、c 应满足关系；②把y=9代入y=x2﹣2bx+bc，得到方程x2﹣2bx+bc﹣9=0，根据根与系数的关系和①的结论即可求得；③把A（m，n）、B（m+4，n）分别代入抛物线的解析式，再根据①的结论即可求出n的值；（2）①因为y=x2﹣2bx+c图象与x轴交于E（5，0），即可得到25﹣10b+c=0，所以c=10b ﹣25；②根据①的距离进而得到k=2b﹣5，再根据E、F之间的整数和为18，即可求出k的取值范围和b的值．【解答】解：（1）①∵二次函数y=x2﹣2bx+c的图象与x轴只有一个交点，∴（2b）2﹣4c=0，∴b2=c；故答案为b2=c；②把y=9代入y=x2﹣2bx+c得，9=x2﹣2bx+c，∴x2﹣2bx+c﹣9=0，∵x1+x2=2b，x1x2=c﹣9，。
PV-电缆(光伏组件用电缆)1、技术规范PV-电缆（光伏组件用电缆）目前尚无国家或行业标准，本试验技术规范所涉及到的要求来自于德国标准化委员会PV-系统用电线K411.2.3工作组的初稿。
这个初稿将作为德国国家标准报批稿进行发布。
德国莱茵TUV(上海)将用此技术规范对PV-电缆的性能进行检测和评估。
在德国莱茵TUV公司内部此技术规范的文件编号为2PfG 1169/08.2007。
2、使用范围2PfG 1169/08.2007适用于最高允许1.8kV(线芯对线芯，非接地系统)直流电压、在光伏系统中CD侧使用的单芯软电缆(电线)。
该产品适合于Ⅱ类安全等级下使用。
电缆运行的环境温度最高到90℃。
电缆可以多根并联使用。
3、特殊名词术语PV 系统(photovoltaic system)：光伏系统(太阳能系统)。
DC侧(DC side)：光伏装置中从光伏电池到光伏换流器直流端子之间的部分。
标准试验条件下的开路电压(UOC STC)：在标准试验条件下，未加载(开路)的光伏组件、光伏电线、光伏列阵、光伏发电机或光伏换流器直流侧的电压。
标准试验条件下的短路电流(ISC TC)：在标准试验条件下，光伏组件、光伏电线、光伏列阵或光伏发电机的短路电流。
4、无卤PV-电缆的基本信息4.1电缆型号PV1-F4.2电缆特性●额定电压：AC U0/U=0.6/1kVDC 1.8kV(线芯对线芯，非接地系统,没有负载下的回路)如果电缆使用在直流系统中，其导体间的额定电压应不大于电缆AC额定值U的1.5倍。
在单相接地直流系统中，此数值应乘以0.5的系数。
●温度范围：环境温度：-40℃到+90℃导体最高工作温度：120℃电缆运行的环境温度最高到90℃。
依据EN60216-1标准进行考核，其绝缘和护套的温度指数是120℃。
期望使用寿命是25年5秒钟的短路温度是200℃4.3电缆结构●导体导体芯数：1导体是EN60228(IEC60228、GB/T3956)中的第5类导体，而且必须是镀锡的。
Q/P企业标准Q/PSHD005-2020代替Q/PSHD005-2014戊二醛（50%）Glutaraldehyde（50%）2020-05-01发布2020-10-01实施发布目录前言 (1)1范围 (2)2规范性引用文件 (2)3要求 (3)4试验方法 (3)4.1警示 (3)4.2一般规定 (3)4.3外观的测定 (3)4.4色度的测定 (3)4.5甲醇含量的测定 (3)4.6含量的测定 (4)4.7PH值测定 (5)4.8澄清度的测定 (5)5检验规则 (6)5.1检验分类 (6)5.2组批 (6)5.3采样 (6)5.4判定规则与复检 (6)5.5检验 (6)6标志、包装、运输和贮存 (6)6.1标志 (6)6.2包装 (7)6.3运输 (7)6.4贮存 (7)7安全 (7)7.1危险警告 (7)7.2安全措施 (7)戊二醛（50%）1范围本标准规定了戊二醛的技术要求、试验方法、检测规则及标志、包装、运输、贮存和安全等。
本标准适用于丙烯醛与乙烯基甲醚合成吡喃，再经水解精制而制得的戊二醛。
分子式：C5H 8 O2结构式：相对分子质量：100.12（按2016年国际相对原子质量）2规范性引用文件下列文件中的条款通过本标准的引用而成为本标准的条款，凡是注日期的引用文件，其随后所有的修改单或修订版均不适用于本标准。
然而，鼓励根据本标准达成协议的各方研究是否可使用这些文件的最新版本，凡是不注日期的引用文件，其最新版本适用于本标准。
GB/T601化学试剂标准滴定溶液的制备GB/T603化学试剂试验方法中所用制剂及制品的制备GB/T6678化工产品采样总则GB/T6680液体化工产品采样通则GB/T6682分析实验室用水规格及试验方法GB/T9724化学试剂PH值测定通则GB/T8170数字修约规则与极限数字的表示和判定GB3143液体化学产品颜色测定法(Hazen单位一铂一钴色号)GB/T4472化工产品密度、相对密度测定通则3要求3.1性状：无色或淡黄色澄清液体，无肉眼可见杂质。
CA -IS3050, CA -IS3052上海川土微电子有限公司 修订版BCopyright © 2020, Chipanalog Incorporated 1 上海川土微电子有限公司CA -IS305x 隔离式CAN 收发器1产品特性• 符合 ISO11898-2 标准 • 高达5000V RMS 隔离耐压• 逻辑侧I/O 电压范围支持2.5V ~ 5 V • 信号传输速率高达1 Mbps• 高共模瞬态抗扰度：150 kV/μs (典型值) • –40 V 至40 V 的总线故障保护 •低环路延时：– 150 ns （典型值） – 210 ns （最大值）• 驱动器（TXD ）主动态超时功能 • 热关断保护• 总线最多可支持110个节点 • 无电节点不干扰总线• 温度范围：–55°C 至125°C •安全和法规认证： 61010-1的VDE 认证– 符合UL 1577 认证， 1 分钟 5 kV RMS– 符合IEC 60950-1、 IEC 61010-1 和 IEC 60601-1认证– 符合EN/UL/CSA 60950-1审批的TUV 5kV RMS 增强绝缘– 符合GB4843.1-2011的CQC 增强绝缘2应用• CAN 数据总线 • 工业现场网络• 楼宇和温室环境控制自动化 • 安防系统 • 运输 • 医疗 • 电信3 概述CA -IS305x 是一款隔离式控制区域网络（CAN ）物理层收发器，符合ISO11898-2标准的技术规范。
此器件采用片上二氧化硅（SiO 2）电容作为隔离层，在CAN 协议控制器和物理层总线之间创建一个完全隔离的接口，与隔离电源一起使用，可隔绝噪声和干扰并防止损坏敏感电路。
CA -IS305x 可为CAN 协议控制器和物理层总线分别提供差分接收和差分发射能力，信号传输速率最高可达 1 Mbps 。
该器件具有限流、过压和接地损耗保护（–40 V 至40 V ）以及热关断功能，可防止输出短路，共模电压范围为–12 V 至12 V 。
DESCRIPTIONThe HIH-5030/5031 Series Low Voltage Humidity Sensors operate down to 2.7 Vdc, often ideal in battery-powered systems where the supply is a nominal 3 Vdc.The HIH 5030/5031 complements our existing line of 5 Vdc SMD (Surface Mount Device) humidity sensors. SMD packaging on tape and reel allows for use in high volume, automated pick and place manufacturing, eliminating lead misalignment to printed circuit board through-holes. The HIH-5030/5031 Series Humidity Sensors are designed specifically for high volume OEM (Original Equipment Manufacturer) users.Direct input to a controller or other device is made possible by this sensor s near linear voltage output. With a typical current draw of only 200 A, the HIH-5030/5031 Series is ideally suited for many low drain, battery operated systems. Tight sensor interchangeability reduces or eliminates OEM production calibration costs.The HIH-5030/5031 Series delivers instrumentation-quality RH (Relative Humidity) sensing performance in a competitively priced, solderable SMD.The HIH-5030 is a covered integrated circuit humidity sensor. The HIH-5031 is a covered, condensation-resistant, integrated circuit humidity sensor that is factory-fitted with a hydrophobic filter allowing it to be used in many condensing environments including industrial, medical and commercial applications. The RH sensor uses a laser trimmed, thermoset polymer capacitive sensing element with on-chip integrated signal conditioning.The sensing element's multilayer construction provides excellent resistance to most application hazards such as condensation, dust, dirt, oils and common environmental chemicals.Sample packs are available. See order guide.FEATURESOperates down to 2.7 Vdc, often ideal in battery-poweredsystems where the supply is a nominal 3 Vdc.Tape and reel packaging allows for use in high volume pickand place manufacturing (1,000 units per tape and reel)Molded thermoset plastic housingNear linear voltage output vs %RHLaser trimmed interchangeabilityLow power designEnhanced accuracyFast response timeStable, low drift performance Chemically resistantPOTENTIAL APPLICATIONSIndustrialAir compressorsBattery-powered systemsDrying equipmentHVAC (includes air conditioning, air movement,thermostats, humidifiers, de-humidifiers, humidistats,enthalpy sensing)OEM assembliesOffice automation equipmentProcess equipmentRefrigeration (includes bulk and transport systems)Telecommunications cabinetsWeather stations and meteorology equipmentMedicalHospital air compressorsInfant incubatorsMicroenvironmentsSleep apnea equipmentTreadmill stress monitoring equipment2/sensing0.5 1.2 AV OUT =(V SUPPLY )(0.00636(sensor RH) + 0.1515), typical at 25C True RH = (Sensor RH)/(1.0546 0.00216T), T in C mV/C C[F] C [F]1. Includes stress outside of recommended operating zone.2. Device is tested at3.3 Vdc and 25 C.3. Non-condensing environment. When liquid water falls on the humidity sensor die, output goes to a low rail condition indicating no humidity.4. Total accuracy including interchangeability is 3 %RH.Sensor is ratiometric to supply voltage.Extended exposure to >90 % RH causes a reversible shift of 3 % RH.Sensor is light sensitive. For best performance, shield sensor from bright light.Honeywell Sensing and Control34/sensingHoneywell Sensing and Control56/sensingHoneywell Sensing and Control7ADDITIONAL HUMIDITY SENSOR INFORMATIONSee the following associated literature is available on the Web : Product installation instructions Application sheets:– Humidity Sensor Performance Characteristics – Humidity Sensor Theory and Behavior– Humidity Sensor Moisture and Psychrometrics – Thermoset Polymer-based Capacitive SensorsSensing and Control Honeywell1985 Douglas Drive NorthGolden Valley, MN 55422 009050-2-EN IL50 GLO Printed in USAMar 2010© 2010 Honeywell International Inc. All rights reserved.WARNINGMISUSE OF DOCUMENTATIONThe information presented in this product sheet is forreference only. Do not use this document as a productinstallation guide.Complete installation, operation, and maintenanceinformation is provided in the instructions supplied witheach product.Failure to comply with these instructions could resultin death or serious injury.WARRANTY/REMEDYHoneywell warrants goods of its manufacture as being free of defective materials and faulty workmanship. Honeywell s standard product warranty applies unless agreed to otherwise by Honeywell in writing; please refer to your order acknowledgement or consult your local sales office for specific warranty details. If warranted goods are returned to Honeywell during the period of coverage, Honeywell will repair or replace, at its option, without charge those items it finds defective. The foregoing is buyer s sole remedy and is in lieu of all other warranties, expressed or implied, including those of merchantability and fitness for a particular purpose. In no event shall Honeywell be liable for consequential, special, or indirect damages.While we provide application assistance personally, through our literature and the Honeywell web site, it is up to the customer to determine the suitability of the product in the application.Specifications may change without notice. The information we supply is believed to be accurate and reliable as of this printing. However, we assume no responsibility for its use.WARNINGSALES AND SERVICEHoneywell serves its customers through a worldwide network of sales offices, representatives and distributors. For application assistance, current specifications, pricing or name of the nearest Authorized Distributor, contact your local sales office or:E-mail:*********************Internet: /sensingPhone and Fax:Asia Pacific +65 6355-2828+65 6445-3033 FaxEurope +44 (0) 1698 481481+44 (0) 1698 481676 FaxLatin America +1-305-805-8188+1-305-883-8257 FaxUSA/Canada +1-800-537-6945+1-815-235-6847+1-815-235-6545 Fax。
TÜV NORD China01储能认证我们关注于01储能系统部件合规性检测认证02储能系统并网检测03储能系统安全及性能检测认证04储能产品生产、安装的监督及评估储能系统组成§储能系统包括：-电池§电芯§BMS§装配设计-PCS§功率§并网-箱体 / 柜体配件§柜体装修（布线，照明，固定，标识）§空调系统（风扇，制冷，保温）§消防系统（探测，灭火）§控制系统（监控，远程通信）电池§按产品类型分-便携式（portable）§IEC 62133-2§IEC 61960§…-工业用（industrial application）§IEC 62619§IEC 62620§….储能电池的合规性认证IEC62619考虑了BMS及模组保护IEC62133更关注与电芯的可靠性与滥用§FS evaluation （开发文件，硬件，软件）•1. Document ReviewDescription of the development process Specifications of the required safety functionsDescription of the safety life cycle (relevant phases of the safety process)User manual•2. Hardware part:Circuit diagram Layout FMEDA•3. Software part:Block diagram/flowchart of the main loop with short explanation Description of the software test Source code (relevant section)IEC 61508§FS test (故障模拟及精度)• 1. Plausibility of voltage measurement• 2. Detection of non-disconnectable switching elements • 3. Open circuit detection of sensing line • 4. Checking the interlocking function for lockout • 5. Fuctional test for load reduction(derating)• 6. Function test with exceeding the operating range limits •7. Checking the BMS measurands功能安全储能电池的合规性认证UL1642UL1973UL9540MC: IEC 61000;RoHS：2011/65/EC功能安全IEC/UL 60730；IEC 61508SAA: IEC 62619AS 62040.1.1RCM: CISPER 25电池化学品属性化学测试ROHS2.0主要测试项目包括：主要包括（铅pb，Cd汞，Hg汞，Cr+6六价铬，PBBs多溴联苯，PBDEs多溴联苯醚以及四种邻苯二甲酸盐（DIBP,DEHP,DBP,BBP)等测试目的是为了测试以上几种物质含量是否超出要求，因此样品要求为：不重复的零部件一套，例如：1.1个电芯2.1块BMS板3.1套线束4.1个外箱等Reach电池指令POPs电池的危险品属性2019年电池运输新规：电池电力设备属性居民家中使用骚扰：IEC/EN 61000-6-1.抗扰：IEC/EN 61000-6-3工商业使用骚扰：IEC/EN 61000-6-2、抗扰: IEC/EN 61000-6-4,主要测试项目包括：辐射/ 传导骚扰，辐射/传导抗扰，静电，EFT，浪涌，工频磁场等产品如具备无线射频模块，特别是2.4G ZigBee，WIFI等短距模块时，产品的电磁兼容测试需补充 EN301489 标准；无线射频模块需满足：EN300328等射频标准；如产品支持蓝牙制式，产品须获得蓝牙组织（SIG）认证BMS§EMC （BMS 及结构设计）1.Radiated Emission2.Electrostatic Discharge Immunity3.Radio Frequency Electromagnetic Field Immunity4.Electrical Fast Transient/Burst Immunity5.Surge Immunity6.Immunity to Conducted Disturbances Induced by RF Fields7.Power Frequency Magnetic Fields ImmunityRadiated EmissionRadiated, Radio Frequency Electromagnetic Field ImmunityPCS & INVERTER储能变流器考核要点电网兼容性考核要点包括：1.电能质量2.有空及无功功率控制3.电压、频率调节4.孤岛防护5.电压及频率保护6.需求响应逆变器的合规性认证北美标准UL1741CSA 107.1Rule 21IEEE 1547德国Low voltage:VDE-AR-N 4105:2018Medium voltage:VDE-AR-N 4110:2018意大利Low voltage:CEI 0-21:2019Medium voltage:CEI 0-16:2019英国Low voltage:G99 & G98;Medium voltage:UK GRID CODE荷兰Low voltage:EN 50549-1:2019Medium voltage:EN 50549-2:2019西班牙Low voltage:RD 1699Medium voltage:P.O. 12.3法国VDE 0126-1-1/A1 VFR 2014美国IEEE 1547-2003IEEE 1547.1-2015澳大利亚AS/NZS 4777.2(新标)韩国KS C 8565:2015巴西ABNT NBR 16149:2013ABNT NBR 16150:2013南非NRS 097-2-1:2017以色列SI 4777.2:2008SI 4777.3:2008泰国PEA:2016MEA:2015印度IEC 61683:1999IEC 61727:2004IEC 62116:2014EN 50530:2010/A1:2013中国GB/T 34120-2018储能系统相关标准的关注点针对集装箱储能系统，目前已有的地区性标准包括 VDE-AR-E 2510-50 (德国），UL 9540及UL9540A 以及IEC 在编订中的IEC 62933-1，IEC 62933-2-1等标准。
Philips BrillianceCurved UltraWide display with USB-C dockP Line34" (86.36 cm)3440 x 1440 (WQHD)349P7FUBEBSimplify your connectionswith revolutionary USB-CSee more and do more with the Philips Brilliance 34" curved ultra-wide display. A crystal-clear wide Quad HD curved display puts you at the center of the attention. All-in-one USB-C and a height-adjustable stand make for the ultimate set-upAdvanced design for your greatest creations•Curved display design for more immersive experience •Narrow border display for a seamless appearanceBrilliant performance•Ultra Wide-Color wider range of colors for a vivid picture •CrystalClear images with UltraWide QHD 3440 x 1440 pixels •MultiView enables simultaneous dual connection and view •100Hz refresh rates for ultra-smooth imagesFeatures for the way you work•All your connections through one USB-C cable•USB 3.0 Hub for convenient access and fast charging Designed for comfortable productivity•LowBlue Mode for easy on-the-eyes productivity•Tilt, swivel and height-adjust for an ideal viewing positionHighlightsCurved display designDesktop monitors offer a personal user experience, which suits a curve design very well. The curved screen provides a pleasant yet subtle immersion effect, which focuses on you at the center of your desk.UltraNarrow BorderThe new Philips displays feature ultra-narrow borders which allow for minimal distractions and maximum viewing size. Especially suited for multi-display or tiling setup like gaming, graphic design and professional applications, the ultra-narrow border display gives you the feeling of using one large display.USB-C DockingThe new USB 3.1 Type-C cable with features a slim and reversible connector and offers easy one-cable-docking. With USB 3.1 you get the fastest data speeds, 20 times as fast as USB 2.0,allowing you to transfer data from a HDD to your PC faster than ever. Simplify by connecting all your peripherals to your monitor as a dock with one cable to the notebook, including high resolution video output from your PC to monitor. Additionally, USB-C with power delivery, can even enable you to power and charge your notebook from the monitor, eliminating the need for extra power cables.Ultra Wide-Color TechnologyUltra Wide-Color Technology delivers a wider spectrum of colors for a more brilliant picture. Ultra Wide-Color wider "color gamut"produces more natural-looking greens, vivid reds and deeper blues. Bring, mediaentertainment, images, and even productivity more alive and vivid colors from Ultra Wide-Color Technology.UltraWide CrystalClear imagesThese Philips screens deliver CrystalClear, UltraWide Quad HD 3440 x 1440 pixelimages. Utilizing high performance panels with high-density pixel count, 178/178 wide viewing angles, these new displays will make your images and graphics come alive. The UltraWide 21:9 format enables moreproductivity with more room for side-by-sidecomparisons and more viewable spreadsheet columns. Whether you are demanding professional requiring extremely detailed information for CAD-CAM solutions, or a financial wizard working on huge spreadsheets, Philips displays delivers CrystalClear images.MultiView technologyWith the ultra-high resolution PhilipsMultiView display you can now experience a world of connectivity. MultiView enables active dual connect and view so that you can work with multiple devices like a PC and notebook simultaneously, for complex multi-tasking.100Hz Fast refreshFor gaming and video performance, you demand display with lag free, ultra-smooth images. This Philips display redraws the screen image up--to 100 times per second, much faster than a standard display. A lower frame rate can make enemies appear to jump from spot to spot on the screen, making them difficult targets to hit. With 100Hz frame rate, you get those critical missing images on the screen which shows enemy movement in ultra-smooth motion so you can easily target them.LowBlue ModeStudies have shown that just as ultra-violet rays can cause eye damage, shortwave length blue light rays from LED displays can cause eye damage and affect vision over time. Developed for wellbeing, Philips LowBlue Mode setting uses a smart software technology to reduceharmful shortwave blue light.Issue date 2022-06-22 Version: 3.0.112 NC: 8670 001 59484 EAN: 87 12581 75888 2© 2022 Koninklijke Philips N.V.All Rights reserved.Specifications are subject to change without notice. Trademarks are the property of Koninklijke Philips N.V. or their respective owners.SpecificationsPicture/Display•LCD panel type: MVA•AMD FreeSync™ technology•Backlight type: W-LED system•Panel Size: 34 inch / 86.36 cm•Display Screen Coating: Anti-Glare, Haze 25%•Color gamut (typical): NTSC 99.8%*, sRGB 117.3%*•Effective viewing area: 797.22 (H) x 333.72 (V) - at a 1800 R curvature*•Aspect ratio: 21:9•Maximum Resolution: 3440 x 1440 @ 100Hz*•Pixel Density: 109.68 PPI•Response time (typical): 4 ms (Gray to Gray)*•Brightness: 300 cd/m²•Contrast ratio (typical): 3,000:1•SmartContrast: 100,000,000 :1•Pixel pitch: 0.232 x 0.232 mm•Viewing angle: 178º (H) / 178º (V), @ C/R > 10•Flicker-free•Picture enhancement: SmartImage•Display colors: 16.7 M•Scanning Frequency: 30 - 160 kHz (H) / 40 - 102 Hz (V) (DisplayPort, USB-C), 23 - 102 Hz (V) (HDMI)•sRGB•LowBlue ModeConnectivity•Signal Input: DisplayPort 1.2, HDMI 2.0 x 1, USB-C (PD up to 65 W)•USB: USB 3.0x3 (1 w/fast charging)*•Sync Input: Separate Sync, Sync on Green •Audio (In/Out): PC audio-in, Headphone out Convenience•Built-in Speakers: 5 W x 2•MultiView: PIP/PBP mode*, 2x devices•User convenience: Menu/OK, User/Down, SmartImage/Return, Multiview/Up, Power On/Off •Control software: SmartControl•OSD Languages: Brazil Portuguese, Czech, Dutch, English, French, Finnish, German, Greek, Hungarian, Italian, Japanese, Korean, Portuguese, Polish, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese, Turkish, Ukrainian •Other convenience: Kensington lock, VESA mount (100x100mm)•Plug & Play Compatibility: DDC/CI, Mac OS X,sRGB, Windows 10 / 8.1 / 8 / 7Stand•Height adjustment: 180 mm•Swivel: -170/170 degree•Tilt: -5/20 degreePower•On mode: 67.09 W (typ.)•Standby mode: < 0.5 W (typ.)•Off mode: < 0.3 W (typ.)•Power LED indicator: Operation - White, Standbymode- White (blinking)•Power supply: External, 100-240VAC, 50-60HzDimensions•Product with stand (mm): 810 x 621 x 311 mm•Product without stand (mm): 810 x 369 x 98 mm•Packaging in mm (WxHxD): 944 x 578 x 224 mmWeight•Product with stand (kg): 9.60 kg•Product without stand (kg): 6.60 kg•Product with packaging (kg): 14.88 kgOperating conditions•Temperature range (operation): 0°C to 40°C °C•Temperature range (storage): -20°C to 60°C °C•Relative humidity: 20%-80 %•Altitude: Operation: +12,000ft (3,658m), Non-operation: +40,000ft (12,192m)•MTBF: 50,000 (Excluding backlight) hour(s)Sustainability•Environmental and energy: RoHS, Mercury Free,WEEE•Recyclable packaging material: 100 %Compliance and standards•Regulatory Approvals: CE Mark, CU-EAC, CB, GS,TUV/ISO9241-307, SEMKO, PSBCabinet•Color: Black•Foot: Black / Silver•Finish: Texture*Radius of the arc of the display curvature in mm*The maximum resolution works for either HDMI, DP or USB-Cinput.*For Video transmission via USB-C, your Notebook/device mustsupport USB-C DP Alt mode*Activities such as screen sharing, on-line streaming video and audioover the Internet can impact your network performance. Yourhardware, network bandwidth and its performance will determineoverall audio and video quality.*For USB-C power and charging function, your Notebook/devicemust support USB-C standard Power Delivery specifications. Pleasecheck with your Notebook user manual or manufacturer for moredetails.*Response time value equal to SmartResponse*NTSC Area based on CIE1976*sRGB Area based on CIE1931*2020 Advanced Micro Devices, Inc. All rights reserved. AMD, theAMD Arrow logo, AMD FreeSync™ and combinations thereof aretrademarks of Advanced Micro Devices, Inc. Other product namesused in this publication are for identification purposes only and maybe trademarks of their respective companies.*Cannot support USB-C vs HDMI for PIP/PBP at the same time*The monitor may look different from feature images.。
In-Line Color Measurement System ERX50Non-contact, spectral color measurement on a production machine with 45°:0° geometry (CIE Standard), with and without excitation of optical brightenersAdvantages of In-Line ColorMeasurement✓Possible corrections before production is out of toleranceresult in reduced waste✓Continuous process monitoring, therefore earlyidentification of disturbances (material, process, control)✓In-Line color measurement is needed for fast manualcontrol and automatic control, resulting in stableproduction and faster and better color changes✓Documentation of the production (ISO 9001)Special Advantages ERX50✓Base color and optical brighteners are measuredseparately. Therefore both components can becontrolled independently.✓Same as in the lab: Stable color measurement dataalso when basis weight changes. Only the opacitychanges✓Excellent results with real spectral resolution of 1 nm✓Ambient light, web speed and normal flutter do notinfluence the accurate measurement resultsAnd this is new:✓Compact style based on the well-known,proven model ER 50 PA(F)✓Latest in electronics and technology✓Stable against distance variations✓Improved reproducibility✓Modular setup, thus even easier to service✓Verification of the automatic internal calibration✓Automatic calibration of the UV content✓If requested, much faster measurement interval✓CAN Bus for faster and more secure data transferFunctional description ERX50The ERX50 is a compact In-Line spectrophotometer with the standardized geometry 45°circular:0°.The sample is measured non-contact 10 mm (0.4 inch) off the instrument (picture 1).Picture 1 MeasurementsFor a measurement a sample will be illuminated by white light (Xenon flash lamp, daylight) and light without UV component under 45°circular for approx. 1 / 1000 sec. Vertical to the sample’s surface (under 0°) the reflected light will be collected and guided to a high resolution spectrometer (picture 2).Simultaneously with the sample measurement a reference measurement of the lamp will be taken with a second high resolution spectrometer (full dual beam design).Picture 2: Function blocks in the ERX50 In both spectrometers the optical measurement signals will be separated into 401 different wavelength signals via corrected holographic concave gratings and measured via 401 photoelectrical sensors. The result is a true 1 nm spectral measurement resolution.The measurement signals will be amplified and digitised with high resolution. A fast processor calculates corrected spectral reflectance data. These 401 reflectance results (from 330 nm to 730 nm) are the basis for all further colorimetric calculations for any possible illuminant and observer (e.g. CIELab data for illuminant D65 / 10° observer or illuminant C / 2° observer).The automatic internal calibration of the system also includes automatic wavelength calibration for excellent measurement accuracy and long-term stability. The calibration will be verified by measuring a known, coloured sample. Calibration of the UV part of the lamp will be checked via an internal brightened white standard. This guarantees high and reproducible measurement accuracy.Control over the color measurement systemERX50 is done via USB interface by a computer (PC); the measurement data will be transmitted to the computer. The CAN bus interface allows distances between the computer and the measuring system of up to 1/3 mile. The built-in optical isolation guarantees stable operation in a real world production environment.Typical ApplicationsThe In-Line spectrophotometer ERX50 is well suited for all applications where the frequent, non-contact color measurement of a product is needed. In most cases it will be a continuous product.ReferencesThe In-Line spectrophotometer ERX50 is successfully working In-Line for the measurement of✓Coated and uncoated paper✓Paper with optical brightener (FWA)✓Laminate paper✓Paper board✓Paper board with white top layer✓Tissue✓Pulp with and without optical brightener ✓Plastic foils✓Textiles✓FibresSpecial advantages of the ERX50♦Precise spectral color measurement✓Also critical colors and demandingapplications can be measured with highquality based on the excellent spectralresolution of 1 nm.✓The wide spectral range of the ERX50 from 330 nm to 730 nm gives excellent information. ✓The sample illumination has adjustable UV and non-UV settings for base white and theoptical brightener.✓Good correlation to the laboratorymeasurements.♦Automatic measurement and calibration✓Precise color measurement because of automatic internal calibration.✓Absolute automatic wavelength calibration with highest precision (0.07 nm).Therefore very good long-term stability andprecision.♦Stable, accurate measurements on the production machine✓24 hours, 365 days per year automatic color measurement on the production machine✓Despite flutter of a few tenth of an inch there are stable measurement results. Specialdistance compensation without moving partsmakes this possible.✓The production speed and ambient light have no influence on the accurate measurementresults.✓The unit is robust, splash water tight (IP 65) and rarely needs service thanks to thecompact design.✓The long-life Xenon flash lamp (1 yearwarranty) is a low-price item.♦Opacity and stack measurement In-Line✓Simulation of the stack measurement right on the machine, which normally is used in thelaboratory. This results in constant colormeasurement with changing basis weight!✓If only the opacity of the paper changes in the machine, the color measurement remainsstable, but the change in opacity will bedisplayed.✓This enables opacity measurement of the paper. (Prerequisite: Measurement frame andsoftware option).♦This ER product family has beensuccessfully measuring in hundreds ofinstallations since 1987✓By continued development and improvements our customers have a proven system with thelatest technology.✓The current model is the fourth generation and has further improved technical data.✓Development and production of the ERX50 spectrophotometer family in Germany.✓Installations worldwide. Turnkey In-Line color measurement system The In-Line spectrophotometer ERX50 is typically sold as turnkey system directly from the manufacturer, including frame, software and computer (picture 3).Support and service are available around the world.At GretagMacbeth you find the experienced experts and proven partners for your color measurement and Closed Loop Color Control!♦In-Line spectrophotometer ERX50 family♦Software✓Quality control✓Opacity and stack measurement✓Automatic Closed Loop Color Control✓Machine interface (sheet break, stop)✓Alarm signal✓Link to other information systems♦Measurement frame (customized)✓Measurement on the web✓Measurement in wet stock♦Dye dosing station✓For continuous control of dye addition✓For Automatic Closed Loop Color Control Picture 3: In-Line color measurement and optionalClosed Loop Color ControlThe GretagMacbeth group supplies:✓Color data products (portable, benchtop, In-Line)✓Software for quality control, color matching and Closed Loop Color Control✓Light booths for visual inspection✓Densitometers, color management systemsTechnical Data ERX50, EPX and ECXColor sensor ERX50Non-contact measurement in the process; not sensitive to ambient light; automatic calibration and measurement; standardized measurement geometry 45°/0°; robust construction; high accuracy and precision; built-in diagnostics with service memory (remote diagnostic).Illumination 45° circularLamp 1 D65 approximated, UV adjustableLamp 2 no UV, wavelength limit typ. 420 nm Measurement 0°Spectral measurement area with UV 330 nm ... 730 nmSpectral resolution (optical !) 1 nmAbsolute wavelength accuracy better than 0,1 nmwith internal automatic controlDual beam (sample and reference channel) simultaneousMeasurement time 20 msMeasurement area 12 mm diameterMeasurement distance (illumination head – sample) 10 mmDistance variation with error dE* < 0,15 8-20mmMeasurement interval 20 sec typ., 3 sec min.Reproducibility CIELAB ∆L*, ∆a*, ∆b* ≤ 0.03(standard deviation for repeated differencemeasurements of the white standard)Interinstrument agreement between ERX50 systemsBased on a white tile ∆L*, ∆a*, ∆b* ≤ 0.1Average color difference for measurement of the12 BCRA standards from production average ∆E* < 0,3Size approx. 170 x 110 x 295 mm³Weight approx. 5 kgProtection IP 65, CE MarkCalibration (traceable to PTB) instrument specific white standardCommunication with computer CAN-Bus, with interface converter on USBSpectral data directly from the measm. head (330nm - 730nm) measured in steps of 1 nmMore data will be available via the computer(see evaluation programs ESWin)Ambient temperature: max. 60°C, with cooling case EGX50PL max. 80°C Power interface EPXInput Voltage 115V/230V AC, +25% / -15%, 45-440 HzPower consumption max. 100 VA, typ. 10 VAMeasurement head interface max. 20 m cableSize approx. 265 x 265 x 135 mm³Weight approx. 2.3 kgProtection IP 65, CE MarkComputer interface ECXInput Voltage 115V/230V AC, +25% / -15%, 45-440 HzPower consumption max. 100 VA, typ. 10 VAInterface to EPX trough CAN-Bus max. 500 m cableUSB interface to computer typ. 1.5 m, max. 3 m cableSize approx. 265 x 265 x 135 mm³Weight approx. 2.4 kgProtection IP 65, CE MarkX-Rite GmbH (formerly GretagMacbeth GmbH)Fraunhoferstrasse 14D-82152 Martinsried / Munich, Germanyt: +49/89/85707-0, f: +49/89/85707-111E-Mail: ****************ERX50 E Brochure Spectrophotometer.doc Version 1.32, 02.12.2014。
2020 年单晶在全球市场份额有望增长至50%
近日，国际知名投行摩根士丹利(Morgan Stanley)发布研究报告对全球光伏市场做出预测。
报告认为，今明两年全球新增装机需求均为67GW 左右，相较2016 年将下降7%，下降的主要原因在于中国、日本和欧洲的需求下降。
摩根士丹利单晶的未来发展空间持乐观态度。
报告称，源自成本的快速
下降和对未来技术更佳的适配性，单晶市场份额预计可在全球范围内增长至35%，到2020 年有望增长至50%，建议增持单晶路线领导者隆基股份。
摩根士丹利在财经界俗称大摩，是一家成立于美国纽约的国际金融服务
公司，在全球42 个国家有1300 多个办事处，提供包括证券、资产管理、企业合并重组和信用卡等多种金融服务。
摩根士丹利发布的观点和报告权威客观，
在全球市场具有强大影响力。
摩根斯坦利年度新增太阳能装机预测
摩根士丹利预计：中国今年全年新增装机27GW，其中上半年和下半年
分别为17GW 和10GW。
与此同时，产业链各个环节的产能却仍在以10%左右的增速在扩张。
因此我们预估到组件环节将面临20%左右的价格降幅，相应的
企业毛利率也会随之下降。
随着整体产业的整合加速，最后领先者将从洗牌中得益。
摩根士丹利表示：被低估的技术路线将重构竞争格局，未来3-5 年高效单晶组件将夺取更大
市场份额，预计可在全球范围内增长至35%，到2020 年有望增长至50%。
实际上，摩根士丹利所预测的这一趋势，已经在全球光伏市场中得到印证。
据EnergyTrend 公布的数据，2015 年全球单晶硅片比例已上升至18%(多晶硅片比例减少至76%)，2016 年，单晶市场占有率已进一步攀升至20%以上。
