午练周练(第6周)
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6、手术成功了一天放学,我回到家,打开鸡窝,高兴得叫起来:“成功了!成功了⋯⋯”爸爸听了连声问:“什么成功了?”“试验成功了。
”我一边说一边拉着爸爸来到鸡窝前,指着那只吃了塑料管的小鸡说:“鸡嗉里的塑料管‘消化’了。
”“哪有这种事?”“不信你摸摸看。
”爸爸一摸鸡嗉,更惊奇了,问我是怎么回事,我高兴地向爸爸讲起了事情的经过。
‖ 自从发现小鸡误吃了不能消化的塑料管后,我一直在想:能不能把小鸡嗉里的管子取出来呢?我左思右想,突然眼睛一亮:有了?医生能给病人剖腹取出瘤块,使病人康复,难道鸡嗉就不能剖开吗?我就借它做个试验吧。
于是我第一次当了外科医生,我想好了动手术的步骤后,拿来消毒药水、剪刀、镊子、针线⋯⋯并请小表弟做我的助手。
手术台就是小椅子。
我让小表弟把鸡仰在椅子上,按住小鸡的脚和头部,不让它乱动。
我先用剪子剪去鸡脖子下的毛,然后用棉花蘸上消毒药水擦洗要开刀的部位,又用一只手捏着鸡嗉上的皮,先划破鸡皮再刺破鸡嗉,这时,鸡“叽叽”地乱叫起来。
看来小鸡痛苦的样子,我的手不知不觉地停了下来,但是为了小鸡的生命,为了试验,我还是硬起头皮,继续将口子划大,然后小心翼翼地将镊子伸进鸡嗉,夹住管子的一端,慢慢拔了出来。
这时从刀口处冒出许多红色的血和气泡,小鸡发出无力的叫声,我心里一阵紧张,连忙用针线将伤口缝好。
‖手术后,我把“小病号”放在温暖的窝里。
小鸡两眼眯着,缩着脖子,蹲在角落里,一动也不动。
我既希望着又担心着。
今天,我回来,看到小鸡不但没死,反而能找食吃了,这不是说明手术成功了吗?爸爸听到了我的介绍,忍不住哈哈地笑起来,夸我敢想敢干,将来可以当医生。
‖1.写出下列词语的反义词。
担心()温暖()紧张()成功()2.结合上下文理解词语。
(1)康复:(2)左思右想:3.在“我既希望着又担心着。
”这句话中我希望什么?担心什么?4.按照指定的分段,写出第二段段意。
5.我是怎样给鸡动手术的?(抓住要点回答)6.作者给鸡动手术为什么会取得成功?1.放心寒冷松弛失败2.(1)恢复健康(2)反复思考3.我希望手术能成功担心小鸡会死4.写我在给小鸡作手术前的准备以及做手术的过程。
高中数学专题复习《一元二次二元一次基本不等式》单元过关检测经典荟萃,匠心巨制!独家原创,欢迎下载!注意事项:1.答题前填写好自己的姓名、班级、考号等信息 2.请将答案正确填写在答题卡上第I 卷(选择题)请点击修改第I 卷的文字说明 评卷人得分一、选择题1.“3x >”是24x >“的( )A .必要不充分条件B .充分不必要条件C .充分必要条件D .既不充分也不必要条件(汇编安徽文)2.设a 、b 、c 是互不相等的正数,则下列等式中不恒成立....的是 (A )||||||c b c a b a -+-≤- (B )aa a a 1122+≥+(C )21||≥-+-ba b a (D )a a a a -+≤+-+213(汇编江苏)(8)3.某农户计划种植黄瓜和韭菜,种植面积不超过50计,投入资金不超过54万元,假设种植黄瓜和韭菜的产量、成本和售价如下表 年产量/亩 年种植成本/亩 每吨售价 黄瓜 4吨 1.2万元 0.55万元 韭菜6吨0.9万元0.3万元为使一年的种植总利润(总利润=总销售收入减去总种植成本)最大,那么黄瓜和韭菜的种植面积(单位:亩)分别为A.50,0 B.30,20 C.20,30 D.0,504.设变量x,y满足约束条件:3123x yx yx y+≥⎧⎪-≥-⎨⎪-≤⎩.则目标函数z=2x+3y的最小值为(A)6 (B)7 (C)8 (D)23(汇编天津理)【考点定位】本小考查简单的线性规划,基础题。
5.某公司在甲、乙两地销售一种品牌车,利润(单位:万元)分别为L1=5.06x-0.15x2和L2=2x,其中x为销售量(单位:辆).若该公司在这两地共销售15辆车,则能获得的最大利润为()A.45.606 B.45.6 C.45.56 D.45.51(汇编湖南文)6.若变量,x y满足约束条件1,,325xy xx y-⎧⎪⎨⎪+⎩≥≥≤,则2z x y=+的最大值为A.1 B.2 C. 3 D.4(汇编全国2理)【答案解析】C7.设不等式组110330530x yx yx y9+-≥⎧⎪-+≥⎨⎪-+≤⎩表示的平面区域为D,若指数函数y=x a的图像上存在区域D上的点,则a 的取值范围是(A)(1,3] (B )[2,3] (C ) (1,2] (D )[ 3,+∞](汇编北京理7)8.若实数a、b满足a+b=2,则3a+3b的最小值是()A.18 B.6 C.23D.243(汇编北京春)9.不等式组⎩⎨⎧<-<-030122x x x 的解集是( )A .{x|-1<x <1}B .{x|0<x <3}C .{x|0<x <1}D .{x|-1<x <3}(汇编北京1)10.设x,y 为正数, 则(x+y)(1x + 4y )的最小值为( ) A . 6 B .9C .12D .15(汇编陕西)11.某工厂第一年年产量为A ,第二年的增长率为a ,第三年的增长率为b ,这两年的平均增长率为x ,则 A .x =2ba + B .x ≤2b a + C .x >2ba + D .x ≥2ba +12.设方程2x +x +2=0和方程log 2x +x +2=0的根分别为p 和q ,函数f (x )=(x +p )(x +q )+2,则A .f (2)=f (0)<f (3)B .f (0)<f (2)<f (3)C .f (3)<f (0)=f (2)D .f (0)<f (3)<f (2)第II 卷(非选择题)请点击修改第II 卷的文字说明 评卷人得分二、填空题13.(本题满分16分)某单位有员工1000名,平均每人每年创造利润10万元。
王营实验学校小学部六年级语文(下)周末练习(第6周)班级:姓名:态度:用时:家长签字:一、根据拼音,写出恰当的字、词。
(14分)līn zhe jīn gū chán zuǐ wú nài bú kān shâ xiǎng()()()()()lián ()政()合()刀窗()xiã()作威()和()要()二、为加点字选择正确的读音。
(4分)教诲(huì huǐ)抡起(lún lūn)望洋兴叹(xìng xīng)乘虚而入(chãng châng)矿藏(cáng zàng )执著(zhùzhuó)情不自禁(jīn jìn)悄(qiāo qiǎo)然无声三、句子练习。
1.联系句子理解词语并造句。
日本地震刚刚结束,又发生了核泄露事故,真是雪上加霜呀!这句中“雪”指的是,“霜”指的是,“雪上加霜”的近义词是。
(3分)2.成语填空孙悟空本领高强,会使筋斗云、;拥有七十二变,、;一双可以。
他曾,闹得玉帝不得安宁,又自封“”:后来经观音点化,保唐僧去,对妖魔鬼怪他是。
(5分)3.选词填空(7分)A讥笑 B微笑 C冷笑 D哄笑 E大笑 F苦笑 G 狞笑(1)生活中遇到困难我们要()着面对。
(2)看了赵本山的小品,我们一个个都()起来。
(3)他的工作仍未如期完成,领导问他原因,他只是()了两声。
(4)对成绩不如我们的同学,我们不能够(),要帮助他们增加成绩。
(5)敌人()着威逼他,他()一声,转过头去。
请写四个带有“笑”字的四字词语:4.填上合适的关联词语。
(4分)A之所以 B是因为C只要 D就 E不仅 F还 G不但 H而且杨老师是计算机专业的高材生。
在电脑维修方面,再难的问题()一到他手上,()会化难为易。
同学们()都喜欢上他的课,()他()专业水平非常高,()上课生动有趣。
龙集小学2021春季六年级语文“周周练”6一.抄写指定内容:正确、工整,力求美观夸父与日逐走,入日;渴,欲得饮,饮于河、渭;河、渭不足,北饮大泽。
未至,道渴而死。
弃其杖,化为邓林。
二.看拼音,写词语三.选择题 1.下列加点字的读音全部相同的一项是 ( ) A .畜.养 畜.牧 牲畜. 畜.产 B .挨.饿 挨.骂 挨.批 挨.着 C .使劲. 劲.头 酒劲. 干劲.儿 D .咽.喉 吞咽. 呜咽. 咽.下 2.“无济于事”中“济”的意思是 ( )A .过河,渡B .救,救济C .帮助,补益D .济水3.下列加点词语使用正确的一项是 ( )A .毕业晚会即将举行,一向热衷集体活动的明明同学上蹿下跳....,做着各种准备工作。
B .在青山绿水间浮光掠影....,在名篇佳作中流连忘返,都能让我们领悟美的真谛。
C .我现在处在一个令人忧伤的、没有言语交流的生活场景中,也许这种生活在世界上是前所未有....的。
4.“镇上的人排着队来到撒切尔法官家,搂着两个获救的孩子又亲又吻……满肚子的话想说又说不出,泪水如雨,洒了一地。
”这句话运用的修辞手法是( )A .拟人B .比喻C .夸张D .排比5.下列名句与“欲知山中事,须问打柴人”表达的意思相同的一项是 ( )A .近水知鱼性,近山识鸟音。
B .读书须用意,一字值千金。
C .听君一席话,胜读十年书。
D .莫道君行早,更有早行人。
6.下列课文与作者及其国籍搭配正确的一项是 ( ) A .《鲁滨逊漂流记(节选)》——丹尼尔·笛福——美国 B .《骑鹅旅行记(节选)》——塞尔玛·拉格洛芙——瑞典 C .《汤姆·索亚历险记(节选)》——马克·吐温——英国四、按要求完成句子练习。
1.鲁滨逊一个人在荒岛上生活,怎能不感到寂寞呢?(改成陈述句)2.人们叮叮当当....地敲响了铁碗铜盆,嘀嘀嗒嗒....的喇叭声与人们的喧嚷声汇成了一片。
高二年级文数第6周训练(__月__日)一.选择题(共6小题,每小题5分) 1 已知集合M={x|10x +>},N={x|101x>-},则M ∩N=( )A {x|-1≤x <0}B {x |x>1}C {x|-1<x <1}D {x |x ≥-1}2 若函数3()f x x =(x R ∈),则函数()y f x =-在其定义域上是( )A 单调递减的偶函数B 单调递减的奇函数C 单凋递增的偶函数D 单涮递增的奇函数3 若向量a 、b 满足|a |=|b |=1,a 与b 的夹角为60︒,则a a +a b = ( )A12B32C12+24 客车从甲地以60km /h 的速度匀速行驶1小时到达乙地,在乙地停留了半小时,然后以 80km/h 的速度匀速行驶l 小时到达丙地 下列描述客车从甲地出发,经过乙地,最后到达丙地所经过的路程s 与时间t 之间关系的图象中,正确的是( )5 图l 是某县参加2007年高考的学生身高条形统计图,从左到右 的各条形表示的学生人数依次记 为1A 、2A 、…、m A (如2A 表示身高(单位:cm )在[150, 155)内的学生人数) 图2是统计 图l 中身高在一定范围内学生人 数的一个算法流程图 现要统计 身高在160~180cm (含160cm ,不含180cm )的学生人数,那么在流程图中的判断框内应填写的条件是( ) A 9i < B 8i < C 7i < D 6i <6.若l 、m 、n 是互不相同的空间直线,α、β是不重合的平面,则下列命题中为真命题的是( ) A 若//,,l n αβαβ⊂⊂,则//l n B 若,l αβα⊥⊂,则l β⊥C 若,l n m n ⊥⊥,则//l mD 若,//l l αβ⊥,则αβ⊥二.填空题(共4小题,每小题5分)7. 以抛物线2:8C y x =上的一点A 为圆心作圆,若该圆经过抛物线C 的顶点和焦点, 那么该圆的方程为 .8. 已知数列{}n a 是等差数列, 若468212a a a ++=, 则该数列前11项的和为 . 9. 某所学校计划招聘男教师x 名,女教师y 名, x 和y 须满足约束条件25,2,6.x y x y x -≥⎧⎪-≤⎨⎪<⎩则该校招聘的教师最多是 名.10 (几何证明选讲选做题)如图4所示,圆O 的直径AB=6,C 为圆周上一点,3B C =过C 作圆的切线l ,过A 作l 的垂线AD ,垂足为D , 则∠答题卡班级:____姓名:____学号:____成绩:____一.选择题7 ()(2219x y -+±=; 8 33 ; 9 10; 10 30︒三.解答题(本小题满分14分)11 已知函数()s i ns i n (),2f x x x x R π=++∈(I)求()f x 的最小正周期;(II)求()f x 的的最大值和最小值;(III)若3()4f α=,求sin 2α的值解: )4sin(2cos sin )2sin(sin )(ππ+=+=++=x x xx xx f(Ⅰ))(x f 的最小正周期为ππ212==T ;(Ⅱ))(x f 的最大值为2和最小值2-;(Ⅲ)因为43)(=αf ,即167cos sin 2①43cos sin -=⇒⋅⋅⋅=+αααα,即 1672sin -=α。
照对市爱民阳光实验学校第一高一英语第6周周末练习第一节单项填空(共15小题;每题l分,总分值l5分)1——Have you finished reading Jane Eyre?一N0,I——my homework all day yesterday.A was doingB would doC had doneD do2 The workers——the glasses and marked on each box〞 This Side UP〞A carriedB deliveredC pressedD packed3 I'll spend half of my holiday practicing English and————halflearning drawing.A anotherB the otherC other’sD other4 As a child, Jack studied in a village school,——is named after his grandfather.A whichB whereC what D. that5 Mary made coffee————her guests were finishing their mealA so thatB althoughC whileD as if6 I have seldom seen my mother——pleased with my progress as she is nowA soB very C. too D rather7 Mrs. White showed her students some old maps from the library.A to borrowB to be borrowedC borrowedD borrowing8 When you are home,give a call to let me know you safely.A are arrivingB have arrivedC had arrivedD will arrive 9 Just be patient .You expect the world to change so soonA can’tB needn’tC may notD will not10 The little boy won’t go to sleep his mother tells him a story.A or B. unless C but D whether11一Everybody is going to climb the mountain. Can I go too, mum?— Wait till you are old enough, dear.A will you?B Why not?C I hope so D. I’m afraid not12 The discovery of gold in Australia led thousands to believe that afortune——A is madeB would makeC was to be madeD had made13 We haven’t discussed yet we are going to place our new furnitureA. that B .which C what D where14 with Father’s Day around the corner, I have taken some money out ofthe bank——presents for my dadA buy B. to buy C buying D to have bought15一Was he sorry for what he’d done?一A No wonderB Well doneC Not reallyD Go ahead第二节完形填空(共20小题;每题l分,总分值20分)It was a busy morning,about 8:30,when an elderly gentleman in his 80s came to the hospital .I heard him saying to the nurse that he wasin a hurry for all appointment(约会)at 9:30. The nurse had him take a 16 in the waiting area, 17 him it would be at least 40 minutes 18 someone would be able to see him I saw him 19 his watch and decided ,since I was 20 busy —my patient didn’t 21 at the appointed hour, I would examine his wound .While taking care of his wound .I asked him if he had another doctor’s appointmentThe gentleman said no and told me that he 22 to go to the nursing home to eat breakfast with his 23 .He told me that she had been 24 for a while and that she had a special disease I asked if she would be 25 if he was a bit late. He replied that she 26 knew who he was ,that she had not been able t0 27 him for five years now. I was 28 , and asked him ,“And you 29 go every morning ,even though she doesn’t know who you are?〞He smiled and said .“She doesn’t know me but I know who she is 〞 I had to hold back 30 as he left.Now I 31 that in marriages ,true love is 32 of all that is The happiest people don’t 33 have the best of everything ;they just 34 the best of everything they have 35 isn’t about how to live through the storm ,but how to dance in the rain. 16 A breath B. test C seat D break17 A persuading B promising C understanding D telling 18 A if B before C since D after19 A taking off B .fixing C looking at D winding 20 A very B also C seldom D not 21 A turn up B show off C come on D go away 22 A needed B forgot C agreed D happened 23 A daughter B wife C mother D sister 24 A. late B well C around D. there25 A lonely B worried C doubtful D hungry26 A so far B neither C no longer D already 27 A recognize B answer C believe D expect28 A moved B disappointed C surprised D satisfied 29 A only B. then C. thus D still30 A curiosity B tears C words D judgment 31 A realize B suggest C hope D prove32 A agreement B expression C acceptance D exhibition 33 A necessarily B completely C .naturally D frequently34 A learn B make C. favor D. try 35 A Adventure B Beauty C Trust D Life 第三阅读理解(共20小题;每题2分,总分值40分) AShakespeare’s Birthplace and Exhibition of Shakespeare’s World Welcome to the world —famous house where William Shakespeare was born in l564 and where he grew up The property(房产)remained in the ownershipof Shakespeare’s family until 1806 .The House has welcomed visitors traveling from all over the world ,for over 250 years.◆Enter through the Visitors’ Centre and see thehighly—praised exhibition Shakespeare's World,a lively andfullintroduction to the life and work of Shakespeare◆Stand in the rooms where Shakespeare grew up◆Discover examples of furniture and needlework fromShakespeare’s period◆Enjoy the traditional(传统的)English garden,plantedwith trees and flower mentioned in the poet’s works○p The Birthplace is within easy walking distance of all the carparks shown on the map;nearest is Windsor Street(3 minutes’ Walk)㊣The House may present difficulties but the Visitors’ Centre,its exhibition.and the garden are accessible (可进入的)to wheelchair users ⊙The Shakespeare Coffee House(opposite the Birthplace)36.How much is the admission for a family of two grown-ups and two children?A.£0. B.£12.00. C.£10. D.£10.37.Where is the nearest parking place to Shakespeare’s Birthplace? A.Behind the exhibition hall. B.Opposite the Visiturs’Centre.C.At Windsor Street.D.Near the Coffee House.38.A wheelchair user may need help to enter .A.the House B.the garden C.the Visitors’ Center D.the exhibition hallBEDGEWOOD - Every morning at Dixie Heights High School, customers pour into a special experiment: the district’s first coffee shop run mostly by students with special learning needs.Well before classes start, students and teachers order Lattes, Cappuccinos and Hot Chocolates. Then, during the first period, teachers call in orders on their room phones, and students make deliveries.By closing time at 9.20 a.m., the shop usually sells 90 drinks. "Whoever made the chi tea, Ms. Schatzman says it was good," Christy McKinley, a second year student, announced recently, after hanging up with the teacher.The shop is called the Dixie PIT, which stands for Power in Transition. Although some of the students are not disabled, many are, and the PIT helps them prepare for life after high school.They learn not only how to run a coffee shop but also how to deal with their affairs. They keep a timecard and receive paychecks, whichthey keep in check registers.Special-education teachers Kim Chevalier and Sue Casey introduced the Dixie PIT from a similar program at Kennesaw Mountain High School in Georgia.Not that it was easy. Chevalier's first problem to overcome was product-related. Should schools be selling coffee? What about sugar content?Kenton County Food Service Director Ginger Gray helped. She made sure all the drinks, which use non-fat milk, fell within nutrition (营养) guidelines.The whole school has joined in to help.Teachers agreed to give up their lounge (休息室) in the mornings. Art students painted the name of the shop on the wall. Business students designed the paychecks. The basketball team helped pay for cups. 39.What is the text mainly about?A.A best-selling coffee.B.A special educational program.C.Government support for schools.D.A new type of teacher-student relationship.40.The Dixie PIT program was introduced in order to_ _.A.raise money for school affairsB.do some research on nutrition C.develop students' practical skillsD.supply teachers with drinks41.How did Christy McKinley know Ms. Schatzman's opinion of the chi tea? A.She met her in the shop.B.She heard her telling others.C.She talked to her on the phone.D.She went to her office to deliver the tea.42.We know from the text that Ginger Gray .A.manages the Dixie P1T program in Kenton CountyB.sees that the drinks meet health standardsC.teaches at Dixie Heights High SchoolD.owns the school’s coffee shopCAlong the river banks of the Amazon and the Orinoco there lives a bird that swims before it can fly, flies like a fat chicken, eats green leaves, has the stomach of a cow and has claws (爪) on its wings when young. They build their homes about 4.6m above the river, an important feature (特征) for the safety of the young. It is called the hoatzin. In appearance, the birds of both sexes look very much alike with brown on the back and cream and red on the underside. The head is small, with a large set of feathers on the top, bright red eyes, and blue skin. Its nearest relatives are the common birds, cuckoos. Its most strikingfeature, though, is only found in the young.Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip. Using these four claws, together with the beak (喙), they can climb about in the bushes, looking very much like primitive birds must have done. When the young hoatzins have learned to fly, they lose their claws.During the drier months between December and March hoatzins fly about the forest in groups of 20 to 30 birds, but in April, when the rainy season begins, they collect together in smaller living units of two to seven birds for producing purposes.43.What is the text mainly about?A.Hoatzins in dry and rainy seasons.B.The relatives and enemies of hoatzins.C.Primitive birds and hoatzins of the Amazon.D.The appearance and living habits of hoatzins.44.Young hoatzins are different from their parents in that . A.they look like young cuckoosB.they have claws on the wingsC.they eat a lot like a cowD.they live on river banks45.What can we infer about primitive birds from the text?A.They had claws to help them climb. B.They could fly long distances.C.They had four wings like hoatzins.D.They had a head with long feathers on the top.46.Why do hoatzins collect together in smaller groups when the rainy season comes?A.To find more food.B.To protect themselves better.C.To keep themselves warm.D.To produce their young.DScience can't explain the power of pets, but many studies have shown that the company of pets can help lower blood pressure (血压) and raise chances of recovering from a heart attack, reduce loneliness and spread all-round good cheer.Any owner will tall you how much joy a pet brings. For some, an animal provides more comfort than a husband/wife. A 2002 study by Karen Allen of the State University of New York measured stress (紧张) levels and blood pressure in people - half of them pet owners –while they performed 5 minutes of mental arithmetic (算术) or held a hand in ice water. Subjects completed the tasks alone, with a husband/wife, a close friend or with a pet. People with pets did it best. Those tested with their animal friends had smaller change in blood pressure and returned most quicklyto baseline heart rates. With pets in the room, people also made fewer math mistakes than when doing in front of other companions. It seems people feel more relaxed (放松)around pets, says Allen, who thinks it may be because pets don't judge.A study reported last fall suggests that having a pet dog not only raises your spirits but may also have an effect on your eating habits. Researchers at Northwestern Memorial Hospital spent a year studying 36 fat people and their equally fat dogs on diet-and-exercise programs; a separate group of 56 people without pets were put on a diet program. On average, people lost about I1 pounds, or 5% of their body weight. Their dogs did even better, losing an average of 12 pounds, more than 15% of their body weight. Dog owners didn't lose any more weight than those without dogs but, say researchers, got more exercise overall-mostly with their dogs - and found it worth doing.47.What does the text mainly discuss?A.What pets bring to their owners.B.How pets help people calm down.C.People's opinions of keeping pets.D.Pet's value in medical research.48.We learn from the text that a person with heart disease has a better chance of getting well if_______.A.he has a pet companion B.he has less stress of workC.he often does mental arithmeticD.he is taken care of by his family49.According to Allen, why did the people do better with pets around when facing stressful tasks?A.They have lower blood pressure.B.They become more patient.C.They are less nervous.D.They are in higher spirits.50.The research mentioned in the last paragraph reports thatA.people with dogs did more exerciseB.dogs lost the same weight as people didC.dogs liked exercise much more than people didD.people without dogs found the program unhelpfulEThere were smiling children all the way. Charily they knew at what time the train passed their homes and they made it their business to stand along the railway, wave to complete strangers and cheer them up as they rushed towards Penang. Often whole families stood outside their homes and waved and smiled as if those on the trains were their favorite relatives. This is the simple village people of Maiaysia. I was moved.I had always traveled to Malaysia by plane or car, so this was thefirst time I was on a train. I did not particularly relish the long train journey and had brought along a dozen magazines to read and reread. I looked about the train. There was not one familiar face. I sighed and sat down to read my Economics.It was not long before the train was across the Causeway and in Malaysia. Johore Baru was just another city like Singapore, so I was tired of looking at the crowds of people as they hurried past. As we went beyond the city, I watched the straight rows of rubber trees and miles and miles of green. Then the first village came into sight, Immediately I came alive;I decided to wave hack.From then on my journey became interesting. I threw my magazines into the waste basket and decided to join in Malaysian life. Then everything came alive. The mountains seemed to speak to me. Even the trees were smiling. I stared at everything as if I was looking at it for the first time.The day passed fast and I even forgot to have my lunch until I felt hungry. I looked at my watch and was surprised that it was 3:00 pm. Soon the train pulled up at Butterworth. I looked at the people all around me. They all looked beautiful. When my uncle arrived with a smile, I threw my arms around him to give him a warm hug (拥抱). I had never done this before. He seemed surprised and then his weather-beaten face warmed up with a huge smile. We walked arm in arm to his car. I looked forward to the return journey.51. The author expected the train trip to beA. adventurousB. pleasantC. excitingD. dull52. What did the author remember most fondly of her train trip?A. The friendly country people.B. The mountains along the way.C. The crowds of people in the streets.D. The simple lunch served on the train.53. Which of the following words can best take the place of the word"relish" in the second paragraph?A. chooseB. enjoyC. prepare forD. carry on54, Where was the writer going?A. Johore Baru,B. The Causeway.C. Butterworth,D. Singapore.55. What can we learn from the story?A, Comfort in traveling by train.B. Pleasure of living in the country.C. Reading gives people delight.D. Smiles brighten people up.第四书面表达(总分值25分)假设你是学生会主席李华。
二年级数学第一学期第1周周周练命题人:蒋玲玲班级姓名学号一、口算:49+7= 65-8= 26+9= 82-60= 6+52=69-27= 37+23= 28+11= 82-62= 30+42=43+34= 57-50= 30+13= 82-64= 34+17=二、竖式计算:46+18+4 100-6-54 65+28-44三、巧算:39+54= + = 83-29= - =66-37= - = 71-43= - =38+38= + = 24+67= + =四、应用题:1、停车场开走18辆小汽车;还有26辆没开走;原来有几辆小汽车2、小强有46支蜡笔;用掉19支后还剩27支;用掉的和剩下的相差几支3、妈妈带来一袋橘子;小亚、小胖共吃掉8只;还剩26只;这袋橘子有几只二年级数学第一学期第2周周周练命题人:蒋玲玲班级姓名学号一、巧算69+16---二、先估后算37+58大约是62+1973-25三、看图填空★★★★★个★;有这样的★★★★★;★★★★★×四、应用题注:写好单位名称、答句1、4块蛋糕装一盒;有5盒;一共有几块蛋糕2、图画书有5本书;故事书是图画书的9倍;故事书有多少本3、教室里原来有8个人;出去活动的有2个人;现在教室里有几个人二年级数学第一学期第3周周周练命题人:蒋玲玲班级姓名学号一、巧算:48+27= + = 73–39= –= 61–28= –=59+22= + =二、填空:1、×= ×=2、0 4 8小青蛙跳了次;每次跳米..跳了2次后是个; ×= 米一共跳了个;共是米五、应用题:1、妈妈买了上衣和裤子共用去79元;买上衣用去35元;买裤子用去几元2、有3只盘子;每盘放10只苹果;3盘放几只苹果3、小亚看书;先看10页;又看10页这本书才看完;这本书共几页4、一个烤箱可以烤5个面包;共3层;这个烤箱可以放几个面包二年级数学第一学期第4周周周练命题人:蒋玲玲班级姓名学号一、填空:1、7+7+7+7+7=个连加的和是 ;也表示的倍是 ;算式:× =2、35里面有个7;4的倍是243、一个盘子里放3个苹果;5个盘子里放个苹果;21个苹果可以放个盘子..4、10的2倍相当于5的倍;5的2倍相当于的1倍;的5倍相当于10的3倍;4的倍相当于8的5倍..5、2+2+2+2+4= ×6、32连续减去8;减次正好等于0..7、○○○○图中○的个数是△的倍△△☆的个数是△的倍☆☆☆☆☆☆☆☆☆的个数是○的倍○和☆的总数是△的倍二、文字题:1、8的6倍是多少2、两个因数都是5;积是多少3、36里面有几个94、5个8连加是多少5、56里面有7个几6、2和8相加是多少三、画一画○有3个;□的个数是○的2倍○有6个是□的2倍画出□:画出□:二年级数学第一学期第5周周周练命题人:蒋玲玲班级姓名学号一、先把口诀写完整;再写出两个乘法算式二四三二十四八五十六二、看图填空☆☆☆○○○○○○○○○○○○◇◇◇◇◇◇图中○是☆的倍;是◇的倍;◇是☆的倍;◇和○的总数是☆的倍..三、算一算;填一填1、2+2+2+2= ;表示个连加是 ;也表示的倍是 ;乘法算式是× = 或× =2、4×7= ;表示个是 ;也表示的倍是四、想一想;画一画画△样子:3×6 △△△△△△△△△△△△△△△△△△4×25的3倍五、应用题写好单位名称、答句1、小巧拿了5本书;小丁丁拿了8本书;他们一共拿了几本书2、一辆小汽车有4个轮子;6辆小汽车有几个轮子二年级数学第一学期第6周周周练命题人:蒋玲玲班级姓名学号1、九七十二七六十三五四十2、7个6是;40里面有个5..3、8×7比8×6的积多4、把6×4=24改编成两道除法算式是和5、28÷4被除数是;除数是;商是..6、45÷5= ;表示把平均分成份;每份是..7、△△○○○○○左图三角形有个;圆有个;圆的个数是三角形个数的倍..8、42里面有个7.. 40是5的倍..9、3个8是;9的6倍是..10、6×9= ;表示个是..也表示的倍是..11、72÷8= ;表示里面有个..还表示把平均分成份;每份是..12、3×=9×;7个3比20多..13、3的8倍是;它也是6的倍..14、一个角有个顶点; 条直边..15、正方体的条棱都 ..正方形的条边都 ; 个角都是角..长方形的4条边; 相等;都是角..16、△△△△△△△△△△△△△△△有个△;每个为一份;可以分份..÷ = 份表示里面有个 ..二年级数学第一学期第7周周周练命题人:刘琴花班级姓名学号巧算:81-57= - = 57+24= + =36+29= + = 76-33= - =列式计算1、5的9倍是多少2、28里面有几个43、把21平均分成3份;每份是多少4、两个因数都是8;积是多少5、3个7是多少6、9是3的多少倍应用题1、食堂买进24袋大米;8袋面粉..大米的袋数是面粉的几倍2、在3月植树活动中;第二小组植树5棵;第三小组植树棵数是第二小组植树棵数的7倍;第三小组植树多少棵3、哥哥把21本书平均分给小里、小军和小明;小军分到多少本4、妈妈买回来24米布;然后平均分成了4块;每块是几米如果每块做2件衣服;可以做多少件二年级数学第一学期第8周周周练命题人:刘琴花班级姓名学号1. 4的3倍是多少2. 42里面有几个63. 56是8的几倍4. 把40平均分成5份;每份是多少5、6与3的和是多少6、42里面有几个67、甲数是乙数的5倍;乙数是8;甲数是多少8、4个5相加是多少 9、 4与5的和是多少10、9的7倍再加9是多少11、除数是3;被除数是6;商是多少应用题1. 小力8天看完一本书;每天看4页;这本书有多少页2. 7个笼子里装35只鸡;平均每个笼子装几只二年级数学第一学期第9周周周练命题人:刘琴花班级姓名学号1、果园里有梨树7棵;苹果树42棵;苹果树的棵数是梨树的几倍2、大生家每天吃2棵白菜;4天吃多少棵现在有16棵白菜;可以吃几天3、老师有8袋乒乓球;每袋6个;借给同学15个;还剩多少个4、红、黄、蓝三色气球一样多;一共18个;红气球有多少个5、小明和他的5个同学植树;每人载了4棵;一共载了多少棵6、运走一些花盆后;剩下的和运走的一样多;运走36盆;原来有多少盆7、把应用题补充完整;再解答出来.学校有20张画片;每个教室贴张;二年级数学第一学期第10周周周练命题人:刘琴花班级姓名学号填空..1、☆☆☆☆☆☆☆☆有个星星;平均分成了份;每份是个..列式:2、72÷9= ;读作:;口诀:表示:..3、45÷5被除数是;商是;除数是 ..乘数是9;被乘数是6;积是 ..4、48是8的倍;2的6倍是 ..5、苹果有4个;桔子的个数是苹果的3倍;桔子的个数是个 ..桔子有个..6、从63、9、8、7 中选三个数;写出两道乘法算式两道除法算式..×=÷=×=÷=7、里最大能填几8 ×<30 × 7<67 4×<254 ×<13 × 9<73 × 5<398、在○里填上“﹥”、“﹤”或“=”..30÷6 ○6 18÷3 ○8 25○5÷57○6÷1 40 ○6×5 4×2 ○16÷4 二年级数学第一学期第11周周周练命题人:刘琴花班级姓名学号一、画一画○的个数是△的3倍△△△△二、列式计算..1、48里面有几个8 5的4倍是多少63是7的多少倍2、除数是8;被除数是40;商是多少3、比74少28的数是多少4、6个9相加得多少七、应用题1、花园里养了15盆花;平均分给5个班;每班分几盆2、花园里养了15盆花;分给两班;一班分5盆;另一个班分几盆二年级数学第一学期第12周周周练命题人:刘琴花班级姓名学号一、填空:1、47-●-●-●-●=27 ●=78-★-★-★-★-★-★=18 ★=24+◎+◎+◎=51 ◎=2、32-4-4-4-4-4-4-4-4=0除法算式:45-9-9-9-9-9=0除法算式:3、6×3 = ;读作:表示:个连加的和是;的倍是 ..4、72÷8 = ;读作:表示:里面有个 ..5、3×3表示个相加;3+3表示个相加..二、按要求把下面各算式填到框里..15÷2 65÷7 25÷520÷928÷4 22÷7没有余数余数是2 余数是1二年级数学第一学期第13周周周练命题人:顾群辉班级姓名学号10÷ = ÷ =表示:10里面有个5.. 表示:把平均分成份;每份是 12÷ = ÷ =表示:12里面有个3.. 表示:把平均分成份;每份是× = 个× = 朵÷ = 盘÷ = 束÷ = 个÷ = 朵个是的倍是加法算式:乘法算式:÷ = = 表示:里面有个 .. 表示:把平均分成份;每份是 ..二年级数学第一学期第14周周周练命题人:顾群辉班级姓名学号判断题长方体的6个面都是长方形..角的两条边越长;角越大..两个数相乘的积;一定比两个数相加的和大..所有的直角大小都是相等的..长方体是特殊的正方体..一个角有一个顶点三条边..4×4-4=0..图形题1、下面图形中是直角的是 ..A B C2、下面图形中哪些是角哪些不是角用“√”或“×”表示..3. 下面哪几个图形是直角是的“√”; 不是“×”4、下面图形各有几个角; 填在里.二年级数学第一学期第15周周周练命题人:顾群辉班级姓名学号几何小实践基础概念1、长方体和正方体都有有个面;有条棱;有个顶点..2、长方体的2个面大小 ;形状 ..3、长方体的棱分3组;每组条棱长短 ..4、正方体每个面都是大小的 ;棱的长短都 ..5、是特殊的长方体..正方形是特殊的6、角有个顶点、条直边..7、长方形和正方形都有个直角; 有条边;长方形边相等;正方形边都相等..8、要搭一个大正方体至少需要个小正方体..9、要拼一个大正方形至少需要个小正方形..数一数个角个正方体个正方体要搭正方体、长方体模型;还缺几个小球;几根小棒1 2正方体长方体缺个小球缺个小球缺根小棒缺根小棒二年级数学第一学期第16周周周练命题人:顾群辉班级姓名学号一、还缺几个小正方体..缺个小正方体二、看图理解1.上图表示个;结果是 ..也表示的倍是 ..写成乘法算式是×= 或×=2.份3.28个;每个一圈;可以圈份;还余个..算式:÷= 份……个4、画一画:1画○的个数是△的3倍.. 2 画2个○;△△△△画□的个数是○的2倍;画△的个数是○的4倍..3画12个○;○的个数是☆的4倍;画出☆..二年级数学第一学期第17周周周练命题人:顾群辉班级姓名学号一、选择题:1、54÷9=6表示A.9个6连加是54 B.54里面有9个6C.把54平均分成6份D.54里面有6个92、下面图形中; 不是角..A.B.C.D.3、右面这个图形;从上面看到的是;从左侧面看到的是;从前面看到的是..A.B.C.D.4、55个;正好平均分给7个小朋友;最少增加个;才可以平均分给9个小朋友..A.5 B.6 C.7 D.85、小巧有15支铅笔;小亚有7支铅笔;小巧送给小亚支两人的铅笔就同样多了..A.2 B.4 C.6 D.8二、应用题:1、小丁丁带60元去买书;买了6本书共用去48元;他剩下多少元2、练习本每本6元;小巧买了3本;小亚买了7本..两人共花去多少元3、幼儿园有奶糖共78粒;每9粒一大包;可以分成几大包还剩几粒二年级数学第一学期第18周周周练命题人:顾群辉班级姓名学号一、想想、填填1、一个长方体有个顶点;有条棱;有个面; 的面大小相等;的棱长度相等..2、角是由个顶点; 条边组成;一把三角尺上有个角;其中直角有个..3、下午2时;时针与分针的夹角是角;钟面上的时针与分针夹角是直角时;是时..4、用小球作顶点和小棒搭正方体;需要个小球和根小棒..5、长方体的一个顶点处有个直角; 条边..6、正方体有个顶点、条棱和个面;每个面都是形;每个面的大小;所有的棱长度..7、是特殊的长方体..八、数数、填填8%1要搭成一个正方体;还缺个小球; 根小棒..2 右图中一共有个二、补条件或问题;再列式解答:有8盘苹果; ;一共有多少个苹果香蕉有12只;橘子有3只;补一个除法计算的问题。
高二年级文数第6周训练(__月__日)一.选择题(共6小题,每小题5分) 1 已知集合M={x|10x +>},N={x|101x>-},则M ∩N=( ) A {x|-1≤x <0} B {x |x>1} C {x|-1<x <1} D {x |x ≥-1}2 若函数3()f x x =(x R ∈),则函数()y f x =-在其定义域上是( )A 单调递减的偶函数B 单调递减的奇函数C 单凋递增的偶函数D 单涮递增的奇函数3 若向量a 、b 满足|a |=|b |=1,a 与b 的夹角为60︒,则a a +a b = ( )A 12B 32 C12+ D 24 客车从甲地以60km /h 的速度匀速行驶1小时到达乙地,在乙地停留了半小时,然后以 80km /h 的速度匀速行驶l 小时到达丙地下列描述客车从甲地出发,经过乙地,最后到达丙地所经过的路程s 与时间t 之间关系的图象中,正确的是( )5 图l 是某县参加2007年高考的 学生身高条形统计图,从左到右 的各条形表示的学生人数依次记为1A 、2A 、…、m A (如2A表示身高(单位:cm )在[150, 155)内的学生人数) 图2是统计 图l 中身高在一定范围内学生人 数的一个算法流程图 现要统计 身高在160~180cm (含160cm ,不含180cm )的学生人数,那么在流程图中的判断框内应填写的条件是( )A 9i <B 8i <C 7i <D 6i <6.若l 、m 、n 是互不相同的空间直线,α、β是不重合的平面,则下列命题中为真命题的是( )A 若//,,l n αβαβ⊂⊂,则//l nB 若,l αβα⊥⊂,则l β⊥C 若,l n m n ⊥⊥,则//l mD 若,//l l αβ⊥,则αβ⊥二.填空题(共4小题,每小题5分)7. 以抛物线2:8C y x =上的一点A 为圆心作圆,若该圆经过抛物线C 的顶点和焦点, 那么该圆的方程为 .8. 已知数列{}n a 是等差数列, 若468212a a a ++=, 则该数列前11项的和为 .9. 某所学校计划招聘男教师x 名,女教师y 名, x 和y 须满足约束条件25,2,6.x y x y x -≥⎧⎪-≤⎨⎪<⎩则该校招聘的教师最多是 名.10 (几何证明选讲选做题)如图4所示,圆O 的直径AB=6,C 为圆周 上一点,3BC =过C 作圆的切线l ,过A 作l 的垂线AD ,垂足为D , 则∠DAC=答题卡班级:____姓名:____学号:____成绩:____10 三.解答题11 已知函数()s i n s i n (),2f x x x x Rπ=++∈(I)求()f x 的最小正周期;(II)求()f x 的的最大值和最小值;(III)若3()4f α=,求sin 2α的值。
午间小练(1)姓名班级学号1.如图,在△ABC中,D是BC的中点,点E、F分别在AB、AC上,且DE∥AC,DF∥AB.求证:BE=DF,DE=CF.2.如图,点C、F在AD上,FA=DC,∠A=∠D,∠B=∠E,.你能证明AB=ED吗?3.如图,△ABC 的角平分线BE,CF相交于点P..求证:点P 在∠A的平分线上.4.如图,AB的垂直平分线分别交AB、AC于点D、E, AC=9,AE:EC=2:1.求点B到点E 的距离。
5.如图,已知△AOD≌△BOC.求证:AC=BD.6.在七年级下册“证明”一章的学习中,我们曾做过如下实验:画∠AOB=90°,并画∠AOB平分线OC.(1)把三角尺的直角顶点落在OC的任意一点P上,使三角尺的两条直角边分别与OA、OB 相交于点E、F(如图1).度量PE、PF的长度,这两条线段相等吗?(2)把三角尺绕点P旋转(如图2),PE与PF相等吗?通过实验可以得到PE=PF的结论,现在请证明这个结论.午间小练(2)姓名班级学号1.(1)已知等腰三角形的周长为10,底边长为4,它的腰长为(2)已知等腰三角形的周长为10,腰长为4,它的底边长为(3)已知等腰三角形的周长为12,一边长为5,它的另外两边的长为2.已知:如图,△ABC≌△A'B'C',AD和A D’分别是△ABC和△A'B'C'中BC和BC边上的高.求证:AD=A'D'.3.已知:如图,在四边形ABCD中,AC、BD相交于点O,AB=DC.∠1=∠2.求证:AC=DB.4.已知△ABC,用直尺和圆规作△ABC的角平分线CD和高AE.(不写画法,保留作图痕迹)5.如图,AD是△ABC的角平分线,DE⊥AB,DF⊥AC,垂足分别为E、F.求证:AD垂直平分EF.6.已知:如图,AB=AC,∠ABD=∠ACD.求证:BD=CD.7.如图,在△ABC中,∠BAC = 90°AB =15,AC=20,AD⊥BC,垂足为D.求AD、BD的长.8.在图中沿正方形的网格线把这个图形分割成两个全等形.你有几种不同的分割方法?(备用图1)(备用图2)午间小练(3)姓名班级学号1.如图,∠A=∠B,∠1=∠2,EA=EB.你能证明AC=BD吗?2.如图,要测量河两岸相对的A、B两点之间的距离,可以在与AB 垂直的河岸BF 上取C、D 两点,且使BC= DC. 从点D出发沿与河岸BF垂直的方向移动到点E使点A、C、E在一条直线上. 测量DE 的长就能知道A、B两点之间的距离. 为什么?3.已知:如图,在△ABC中,AB=AC,AD是高,DE⊥AB,DF⊥AC,垂足分别为E、F. 求证: DE=DF4.已知:如图,AB=AE,BC=ED,AF垂直平分CD.求证:∠B=∠E.5.如图,∠C =36○,∠B=72○∠BAD =36○(1)求∠1和∠2的度数.(2)找出图中的等腰三角形并加以证明.6.有一根长70 cm的木棒,要放入长、宽、高分别是50 cm、40 cm、30cm 的木箱中(如图),能放进去吗?7.根据下列已知条件,分别指出各个图形中的等腰三角形,并加以证明.(1)如图1,BD平分∠ABC, DE∥AB;(2)如图2,AD平分∠BAC, EC∥AD;(3)如图3,AD平分∠BAC, GE∥AD, GE交AB于点F午间小练(4)姓名班级学号1.如图,CD⊥AB,BE⊥AC,垂足分别为D、E,BE、CD相交于点O.如果AB=AC,那么图中有几对全等的直角三角形?试证明你的结论.2.如图,工人师傅常用“卡钳”这种工具测定工件内槽的宽度. 卡钳由两根钢条AA'、BB'组成,O为AA'、BB'的中点. 只要量出A'B'的长度,就可以知道工件内槽AB的长度. 你能说明这样测量的理由吗?3.15.已知:如图,MS⊥PS,MN⊥SN,PQ⊥SN,垂足分别为S、N、Q且MS = PS.求证: △MNS≌△SQP.4.如图,在△ABC中,∠∠ABC、∠ACB的平分线相交于点O,MN过点O且MN∥BC,交AB、AC于点M、N. 求证:MN=BM+CN.5.已知:如图∠BAC的角平分线与BC的垂直平分线交与点D,DE⊥AB,DF⊥AC,垂足分别为E、F.求证:BE=CF.6.(1)如图,在△ABC中,∠BAC=90°,AB=AC, 点D在BC上,且BD=BA.点E在BC的延长线上,且CE=CA,求∠DAE的度数;(2)如果把第(1)题中“AB=AC”的条件舍去,其余条件不变,那么∠DAE 的度数会改变吗?(3)如果把第(1)题中“∠BAC=90°"的条件改为“∠BAC>90°",其余条件不变,,那么∠DAE与∠BAC有怎样的大小关系?午间小练(5)姓名班级学号1.《九章算术》中有一道“引葭赴岸”问题:“今有池一丈,葭生其中央,出水一尺,引葭赴岸,适与岸齐.问水深,葭长各几何?”题意是:有一个池塘,其底面是边长为10尺的正方形,一棵芦苇AB生长在它的中央,高出水面部分BC为1尺.如果把该芦苇沿与水池边垂直的方向拉向岸边,那么芦苇的顶部B恰好碰到岸边的B'(如图),水深和芦苇长各多少尺?2.已知:如图,在△ABC中,AC=BC,∠ACB=90○,D是AB的中点,点E在AC上,点F在BC上,且AE=CF求证:DE=DF3.如图:点A、B、C、D在一条直线上,AE∥BF,CE∥FD,求证:AB=CD.4.如图,已知△ABC(1)用直尺和圆规按下列要求作图:(保留作图痕迹)作△ABC的角平分线AD;作∠CBE=∠ADC,BE交CA的延长线于E; 作AF⊥BE,垂足为F.(2)图中BF与EF相等吗?证明你的结论.5.如图,在△ABC中,BC=7,AB的垂直平分线分别交AB,BC于点D,E,AC的垂直平分线分别交AC,BC于点F,G,求△AEG的周长.6.如图,△ABC和△CDE都是等边三角形,且点A、C、E在一条直线上.AD与BE相等吗?证明你的结论.午间小练(6)姓名班级学号1.在等腰三角形ABC中,∠A=4∠B(1)∠A 是顶角,∠C为(2)∠A 是底角,∠C为2.在△ABC中,∠A =40○.当∠B= ,△ABC是等腰三角形.3.已知:如图,AB=AC,DB=DC,点E在AD上,求证:EB=EC4.已知:如图,ED⊥AB,FC⊥AB,垂足分别为D、C,AE//BF,且AE=BF。
一、选择题1.关于合运动和分运动,下列说法正确的是()A、两个分运动是先后进行的B、两个分运动可以先后进行,也可以同时进行C、两个分运动一定是同时进行的D、先有两个同时进行的分运动,后有合运动2.如图所示,一轻绳通过无摩擦的小定滑轮O与小球B连接,另一端与套在光滑竖直杆上的小物块A连接,杆两端固定且足够长,物块A由静止从图示位置释放后,先沿杆向上运动.设某时刻物块A运动的速度大小为v A,小球B运动的速度大小为v B,轻绳与杆的夹角为θ。
则()A.v A=v B cosθB.v B=v A cosθC.小球B减小的重力势能等于物块A增加的动能D.当物块A上升到与滑轮等高时,它的机械能最大3.某人以一定速率垂直河岸向对岸游去,当水流运动是匀速时,他所游过的路程、过河所用的时间与水速的关系是A、水速大时,路程长,时间长B、水速大时,路程长,时间短C、水速大时,路程长,时间不变D、路程、时间与水速无关4.下列关于平抛运动的说法中正确的是()A.平抛运动是匀变速运动 B.平抛运动是变加速运动C.任意两段时间内加速度相同D.任意两段相等时间内速度变化不相同5.物体在做平抛运动中,在相等时间内,下列哪些量相等A.速度的增量B.加速度 C.位移的增量D.位移6.如图所示,一位质量m=60kg参加“江苏调考在一次消防逃生演练中,队员从倾斜直滑道AB 的顶端A由静止滑下,经B点后水平滑出,最后落在水平地面的护垫上(不计护垫厚度的影响)。
已知A、B离水平地面的高度分别为H=6.2m、h=3.2m,A、B两点间的水平距离为L=4.0m,队员与滑道间的动摩擦因数μ=0.3,g取10m/s2。
求:⑴队员到达B点的速度大小;⑵队员落地点到B点的水平距离;⑶队员自顶端A至落地所用的时间。
一、选择题1.在轻绳的一端系一个小球,另一端固定在轴上,心到小球中心的距离为L 圆周最高点时绳的拉力大小为(空气阻力忽略不计)A .0B .mgC .4mgD .6mg2.船在水速较小的河中横渡,船划行速度一定并且船头始终垂直河岸航行,到达河中间时,因上游突然涨水使水流速度加快,则小船渡河的时间、位移与未涨水相比A .小船到达对岸的位移将变大,过河时间将增长B .小船到达对岸的位移将变大,过河时间将不变C .小船到达对岸的位移不会发生变化,过河时间将缩短D .因船速与水速关系未知,故无法确定渡河时间及位移的变化3.对于做匀速圆周运动的物体,下面说法中不正确的是A .线速度的大小不变 B.线速度不变 C.角速度不变 D.周期不变4.铁路在弯道处的内外轨道高度是不同的,已知内外轨道平面与水平面的倾角为θ,弯道处的圆弧半径为R ,若质量为m 的火车转弯时速度小于θtan gR ,则( )A .内轨对内侧车轮轮缘有挤压B .外轨对外侧车轮轮缘有挤压C .这时铁轨对火车的支持力等于θcos mgD .这时铁轨对火车的支持力大于θcos mg 5.一条小船在静水中的速度为6m/s ,要渡过宽度为60m 、水流速度为10m/s 的河流.下列说法正确的A .小船渡河的最短时间为6sB .小船渡河的最短时间为10sC .如水流速度增加,小船渡河的最短时间也增加D .小船渡河的最短路程为60m6.关于平抛运动下列说法正确的是( )A.平抛运动在运动过程中,其加速度和水平速度保持不变B.平抛运动可以分解为匀速直线运动和自由落体运动C.平抛物体是做曲线运动,因此它不是匀变速运动D.平抛物体水平飞行的距离只与初速度有关7.关于曲线运动,下列说法中正确的是 ( )A .曲线运动一定是变速运动B .曲线运动速度的方向不断变化,但速度的大小可以不变C .曲线运动的速度方向可能不变D .曲线运动的速度大小和方向一定同时改变8.如图所示的皮带传动装置中,甲、乙、丙三轮的轴均为水平轴,其中甲、丙两轮半径相等,乙轮半径是丙轮半径的一半.A 、B 、C 三点分别是甲、乙、丙三轮的边缘点,若传动中皮带不打滑,则( )A.A、B两点的线速度大小之比为2:1 B.A、C两点的角速度大小之比为1:2C.A、B两点向心加速度大小之比为2:1 D.A、C两点的向心加速度大小之比为1:4 9.如图所示,物体A和B的质量均为m,且分别与跨过定滑轮的轻绳连接(不计绳与滑轮、滑轮与轴之间的摩擦),在用水平变力F拉物体B沿水平方向向右做匀速直线运动的过程中( )A.物体A也做匀速直线运动B.绳子拉力始终大于物体A所受重力C.绳子对A物体的拉力逐渐增大D.绳子对A物体的拉力逐渐减小10.如图所示,斜面倾角为 ,从斜面的P点分别以v0和2v 0的速度水平抛出A、B两个小球,不计空气阻力,若两小球均落在斜面上且不发生反弹,则A.A、B两球的水平位移之比为1:4 B.A、B两球飞行时间之比为1:2C.A、B下落的高度之比为1:2 D.A、B两球落到斜面上的速度大小之比为1:4三、实验题11.小张同学采用如图1所示的实验装置做“研究平抛运动”的实验。
1)实验时下列哪些操作是必须的?______(填序号)①将斜槽轨道的末端调成水平②用天平称出小球的质量③每次都要让小球从同一位置由静止开始运动(2)实验时小张同学忘记在白纸上记录小球抛出点的位置,于是他根据实验中记录的点迹描出运动轨迹曲线后,在该段曲线上任取水平距离均为△x=20.00cm的三点A、B、C,如图2所示,其中相邻两点间的竖直距离分别为y1=10.00cm,y2=20.00cm。
小球运动过程中所受空气阻力忽略不计。
请你根据以上数据帮助他计算出小球初速度v0=_____m/s。
(g取10m/s2)12.(1)在“研究平抛物体的运动”的实验中,为了描出物体的运动轨迹,实验应有下列各个步骤:A.以O为原点,画出与y轴相垂直的水平轴x轴;B.把事先做的有缺口的纸片用手按在竖直木板上,使由斜槽上滚下抛出的小球正好从纸片的缺口中通过,用铅笔在白纸上描下小球穿过这个缺口的位置;C.每次都使小球由斜槽上固定的标卡位置开始滚下,用同样的方法描出小球经过的一系列位置,并用平滑的曲线把它们连接起来,这样就描出了小球做平抛运动的轨迹;D .用图钉把白纸钉在竖直木板上,并在木板的左上角固定好斜槽;E .在斜槽末端抬高一个小球半径处定为O 点,在白纸上把O 点描下来,利用重垂线在白纸上画出过O 点向下的竖直直线,定为y 轴。
在上述实验中,缺少的步骤F 是___________________________________________,正确的实验步骤顺序是__________________。
(2)如图所示,在“研究平抛物体运动”的实验中,用一张印有小方格的纸记录轨迹,小方格的边长l=1.25cm 。
若小球在平抛运动途中的几个位置如图中的a 、b 、c 、d 所示,则小球平抛的初速度的计算式为v o = (用l 、g 表示),其值是 (取g=9.8m/s2),小球在b 点的速率是 。
四、计算题13.如图所示,让摆球从图中的A 位置由静止开始下摆,正好摆到最低点B 位置时线被拉断。
设摆线长l =1.6 m ,悬点到地面的竖直高度为H =6.6 m(1)摆球落地时的速度。
(2)落地点D 到C 点的距离(g =10 m /s 2)。
14如图所示,AB 为1/4光滑圆弧轨道,圆弧轨道的半径为R=3m ,A 点为1/4圆弧轨道的顶端,A 点与圆心O 在同一水平面上。
BC 为粗糙水平轨道,滑块与BC 轨道的动摩擦因数为µ=0.5,BC 长L=2m 。
CD 是倾角为θ=光滑斜轨道。
一质量为m=3kg 小滑块从A 点以v 0=2m/s 的初速度沿AB 圆弧滑下,(斜轨道与水平轨道交接处有一段很小的圆弧,滑块经过交接处时与轨道的碰撞所引起的能量损失可以不计,取10m/s 2)求:(1)滑块第1次经过光滑圆弧最低点B 点时,轨道对滑块的支持力N的大小. (2)滑块沿光滑斜轨道CD 能上升的最大高度(3)滑块最后停止的位置到B 点的距离。
.参考答案午练(第6周)1.C2.BD3.C4.AC5.AB6.解析】(1)设滑道的长度为L AB,倾角为θ,根据动能定理有(3分)(2)根据平抛运动的公式有,(2分)得水平距离(2分)(3)设在滑道上运动的时间为t1,加速度为a,根据牛顿第二定律有得=3.6m/s2(2分)根据运动学公式有(2分)得t1=s="1.67s" ,t2=0.80s运动的总时间t= t1+ t2=2.47s (1分)参考答案周练(第6周)1.A 2.B 3.B 4.A 5.B 6.A B 7.AB 8.BD 9.BD 10.AB11.(1)①③(2)212.(1)调整斜槽使放在斜槽末端的小球可停留在任何位置,说明斜槽末端切线已水平;DFEABC(2)0.7m/s;0.875m/s13.【解析】(12分)解(1)球从A到B受重力和线的拉力,只有重力做功,球从B到D做平抛运动,也只有重力对球做功,故球从A到D运动的全过程中机械能守恒,取地面为参考面,则得:(2)在球从A到B的过程中,根据机械能守恒定律(取B点所在的水平面为参考面)得解得:,球从B点开始做平抛运动到D点时下落的高度为则球做平抛运动的时间为:球着地点D到C点的距离为:14【解析】(1)根据动能定理有......(1)2分经过B点时,小球做圆周运动,有................(2)1分其中,R=3m,由(1)(2)式得...........(3)1分(2)以A点运动到斜面最高点为全过程,根据动能定理有................................(5)2分.............................................(6)1分代入数据,由(5)(6)式可得,......................(7)1分(3)滑块最终只能停止在水平轨道上,从开始到停止的全过程,根据动能定理有.....................................(8)2分根据(2)小题中的相关数据,可求得................(9)1分,表示滑块在水平轨道上通过的路程为6.4m,由于BC长为2 m,所以最终滑块停止的位置到距离B点的距离为1.6m....................(10)2分。