《机械工程专业英语》测验题(18-22) 将下列词组译成汉语
the base circle（基圆）
the pitch curve（啮合曲线）
the contact force（接触力）
the intermittent motion（间歇运动）the common normal（公法线）
the conjugate profiles（共轭齿廓）
the cycloidal profiles （摆线齿形）
the involute profiles（渐开线齿形）the spur gear（直齿轮）
the herringbone gears（双螺旋齿轮）the face gear（端面齿轮）
the radial distance（径向距离）
the addendum circle（齿顶圆）
The tooth thickness（齿厚）
the tooth space（齿间隙）
the cap screws（螺钉）
the setscrews（固定螺丝钉）
the engineering graphics（工程力学）mechanical design（机械设计）
the installation techniques（安装技术）the bolted joint（螺栓连接）
the hardened washers（强化垫圈）the fatigue resistance（抗疲劳强度）the modulus of elasticity（弹性模量）the antifriction bearing（减摩轴承）the rolling bearing（滚动轴承）
the rolling contact （滚动接触）
the sliding contact（滑动触电）
the corrosion resistance（抗腐蚀性）the machining tolerances（加工公差）the fatigue loading（疲劳载荷）
the radial loads（径向负荷）
the thrust loads逆负荷
the ball bearing球轴承
the roller bearing滚子轴承
the single-row bearings单沟轴承
the double-row bearing双沟轴承
the needle bearing滚针轴承
the bearing life轴承寿命
The rating life额定寿命
the axis of rotation旋转轴
The helix angle螺旋角
a right-hand helix 右旋
a left-hand helix左旋
an involute helicoids螺旋面
an involute curve渐开线
the shaft centerlines轴中心线
worm gear蜗轮
the hypoid gear准双曲面齿轮
right angle直角
worm gearing蜗杆传动
the lead angle导角
shaft angle轴线角度
bending load弯曲载荷
tension load张力负荷
compression load压缩负载
torsional load扭转负荷
the bending moment弯矩
the bending stress弯曲应力
the shot peening喷丸法
the actuating force工作力
the coefficient of friction摩擦系数
An electromagnetic coil电磁线圈
the magnetic circuit磁路
将下列短语译成汉语
disk or plate translating (two-dimensional or planar) 盘形传动凸轮（两维的，即平面的）cylindrical (three-dimensional or spatial) cams圆柱形凸轮（三维的，即空间的）机构
a radial (in-line) translating roller follower一个对心直动滚子从动件
a constant angular velocity ratio旋转角速度的比例
a constant torque ratio一个恒转矩比
Nonlinear angular velocity ratios非线性角速度比率
the parallel helical gear平行斜齿轮
the crossed helical gear交叉斜齿轮
the straight bevel gear直锥齿轮
the spiral bevel gear弧齿锥齿轮
the skew bevel gear大角度斜交锥齿轮
the hexagon head screws六角头螺钉
the fillister head screws槽头螺钉
the flat head screws 平头螺钉
the hexagon socket head screws内六角沉头螺钉。
the external tensile load外部拉伸载荷
the external shear load外部剪切负荷
The single-row deep-groove bearing单列深沟轴承
The angular-contact bearing角接触轴承
the self-aligning bearings自动调心轴承
the straight roller bearings直滚子轴承
the spherical-roller thrust bearing球形辊止推轴承
the tapered roller bearings圆锥滚子轴承
the condition of statical equilibrium浅析条件下平衡
the positive-contact clutches强制接触离合器
the overload-release clutches超载释放保护离合器
the overrunning clutches超越离合器
the magnetic fluid clutches磁流变离合器
将下列单词译成汉语
cam凸轮
camshaft凸轮轴
accuracy精度
dependability可靠性
pulley滑轮
flywheel飞轮
crank曲柄
sprocket链轮
axle心轴
spindle主轴
clutche离合器
brake制动
四．翻译下列句子
1．Although a cam and follower may be designed for motion, path, or function generation, the majority of applications utilize the cam and follower for function generation.
虽然可以把凸轮和它的从动件设计为用于运动变换，路径变换或者函数变换，但大多数用途是利用凸轮和它的从动件做函数变换。
2. In the case of a disk cam with a radial (in-line) translating roller follower the smallest circle that can be drawn tangent to the cam surface and concentric with the camshaft is the base circle. 对于一个对心直动滚子从动件盘形凸轮，可画出的与凸轮表面相切且与轮轴同心的最小圆是基圆
译文P40 [1]
3. Numerous applications in automatic machinery require intermittent motion. A typical example will call for a rise-dwell-return and perhaps another dwell period of a specified number of degrees each, together with a required follower displacement measured in centimeters or degrees.
在自动化机械中的许多应用需要间歇运动。一个典型的例子将要求一个含有上升一停歇一返回和可能另一个停歇的周期，每阶段经过一个指定的角度，伴随着一个所要求的从动件的位移，这个位移以厘米或度来度量。
译文P40 [2]
4．Any two mating tooth profiles that satisfy the fundamental law of gearing are called conjugate profiles.
任何满足齿轮传动基本定律的一对相互啮合齿廓称之为共轭齿廓。
5. Although there are many tooth shapes possible in which a mating tooth could be designed to
satisfy the fundamental law, only two are in general use: the cycloidal and involute profiles.
虽然可以设计出有很多齿廓来满足传动装置的基本定律，但通常所使用的只有两种：即摆线齿廓和渐开线齿廓。
6. Typical methods of fastening and joining parts include the use of such items as bolts, nuts, cap screws, setscrews, rivets, locking devices and keys.
紧固和联结零部件的典型方法包含使用这些零件：螺栓，螺母，有头螺钉、定位螺钉，铆钉，锁紧装置和键。
7. Methods of joining parts are extremely important in the engineering of a quality design, and it is necessary to have a thorough understanding of the performance of fasteners and joints under all conditions of use and design.
在质量设计工程中，联结零部件的方法非常重要，因此，彻底了解紧固零件和联结零件在所有使用和设计条件下的性能是非常必要的。
8. When a connection is desired which can be disassembled without destructing the parts assembled and which is strong enough to resist both external tensile load and shear load, or a combination of these, then the simple bolted joint using hardened washers is a good solution.
当想要一个可以被拆开又不破坏被联接零件的联接时，而且这个联接又要有足够的强度以承受外拉力和剪力或这两种力的结合，使用淬火垫圈的简单螺栓联结是一个很好的方法。
译文P43 [2]
9. The problem of the specialist in mechanical design is not how to design a rolling bearing but, rather, how to select one.
在机械设计中，专家所面临的问题，不是如何设计轴承，而是如何挑选轴承。
10. The term antifriction bearing is used to describe that class of bearing in which the main load is transferred through elements in rolling contact rather than in sliding contact.
减摩轴承这个词被用于描述这样一类轴承，其主要载荷是通过滚动接触而不是滑动接触的元件传递的．
11. It is this gradual engagement of the teeth and the smooth transfer of load from one tooth to another, which give helical gears the ability to transmit heavy loads at high speeds．
正是螺旋齿轮，从一个齿到另一个齿的逐渐啮合和载荷的平稳传递，给了螺旋齿轮在高速下传递重载荷的能力．
12. A shaft is a rotating or stationary member, usually of circular cross section, having mounted upon it such elements as gears, pulleys, flywheels, cranks, sprockets, and other power-transmission elements.
轴是一个固定或转动的零件，通常是圆截面的，在它上面安装了如齿轮，带轮，飞轮，曲柄，链轮等零件和其他动力传递零件．
13. Roughing, for which the metal removal rate, and consequently the cutting force, is high, but the required dimensional accuracy relatively low.
粗加工，通常金属切削率和切削力高，但所要求的尺寸精度相对低。
14. Machines using basically the single-point cutting tools include: (1) engine lathes, (2) turret lathes, (3) tracing and duplicating lathes, (4) single-spindle automatic lathes, (5) multi-spindle automatic lathes, (6) shapers and planers, (7) boring machines.
使用单刃切削刀具的机床主要包括：(1)普通车床，(2)六角车床，(3)仿形车床，(4)单轴自动车床，(5)多轴自动车床，(6)牛头刨床和龙门刨床, (7)镗床。
15. Upright drilling machines or drill presses are available in a variety of sizes and types, and are equipped with a sufficient range of spindle speeds and automatic feeds to fit the needs of most
industries.
立式钻床或钻孔压力机，具有各种各样的尺寸和类型，为了适合大多数工业的需求，这些机床都装配有充足的轴速范围和自动进给量。
16. Chemical milling is controlled etching process using strong alkaline or acid etchants. Aluminum, titanium, magnesium, and steel are the principal metals processed by this method.
化学蚀刻，通过使用强碱或强酸蚀刻剂来控制蚀刻过程，铝，钛，镁和钢是用这种方法处理的主要金属。
17. Antifriction bearings are used in a great variety of products, toys, household products, refrigerators, roller stakes, garage doors, trucks, industrial machinery, dental equipments and guided missiles, for example.
减摩轴承使用在各种各样的产品中，例如：玩具，家用产品，电冰箱，轧辊座，汽车门，卡车，工业机械，牙医设备和导弹等等。
18. The important difference between the two is that area contact exists between the teeth of double-enveloping gears while only line contact between those of single-enveloping gears.
这两者之间的重要区别是：在双包围蜗轮组的轮齿间有面接触，而在单包围蜗轮组的轮齿间只有线接触。
19. Although positive clutches are not used to the extent of the frictional-contact type, they do have important applications [3] where synchronous operation is required.
虽然强制接触离合器不像摩擦离合器用得那么广泛，但在需要同步操作时，它们确实有着非常重要的应用。
20. Finishing, for which the metal removal rate, and consequently the cutting force, is low, but the required dimensional accuracy and surface finish relatively high.
精加工，通常金属切削率和切削力低，但所要求的尺寸精度和表面光洁度相对高。
21. Machines using multipoint cutting tools include: (1) drilling machines, (2) milling machines, (3) broaching machines, (4) sawing machines, (5) gear-cutting machines.
使用多刃切削刀具的机床包括：(1)钻床，(2)铣床，(3)拉床，(4)锯床，(5)齿轮切削机床。
22. Tracer milling is characterized by coordinated or synchronized movements of either the paths of the cutter and tracing elements, or the paths of the workpiece and model.
仿形铣床的特点是刀具和跟踪元件的轨迹运动的协调或同步，或者是工件和模型的轨迹运动的协调或同步。
23. The problem of the specialist in mechanical design is not how to design a rolling bearing but, rather, how to select one.
在机械设计中，专家所面临的问题，不是如何设计轴承，而是如何挑选轴承。
24. The ultrasonic machining process is applied to both conducting and non-conducting material, and relies entirely upon abrasive action for metal removal.
超声波加工工艺既应用于导体材料，也用于非导体材料，并且完全依赖于磨损作用进行金属切削。
五．翻译下列短文
1. Numerous applications in automatic machinery require intermittent motion. A typical example will call for a rise-dwell-return and perhaps another dwell period of a specified number of degrees each, together with a required follower displacement measured in centimeters or degrees. [2] The designer's job is to lay out the cam accordingly. The first decision to be made is to choose the cam follower type. The specified application may dictate the combination of the cam and follower. Some factors that should enter into the decision are: geometric considerations, dynamic considerations, environmental considerations and economic matters. Once a type of cam and follower pair has been selected, the follower motion must be chosen. Therefore, the velocity, acceleration, and in some cases further derivatives of the displacement of the follower are of great importance.
在自动化机械中的许多应用需要间歇运动。一个典型的例子将要求一个含有上升一停歇一返回和可能另一个停歇的周期，每阶段经过一个指定的角度，伴随着一个所要求的从动件的位移，这个位移以厘米或度来度量。设计者的工作就是相应地设计出该凸轮。首先要做的决策就是要选择凸轮从动件的类型。规定的应用可能要求凸轮和从动件相结合。转化为决策的某些因素有：几何形状条件，动力条件，环境条件和经济因素。一旦凸轮与从动件运动副类型被选定，则从动件运动就必定选定。因此，速度、加速度和在某些情况下，从动件位移的进一步的方案实属极端重要。
新概念英语一测试题答案 (1) 数词, 冠词, 介词, 动词时态变化, 比较级和最高级 一写出复数 1. radios 2. knives 3. glasses 4. shelves 5. bosses 6. dresses 7. housewives 9. leaves 10. churches 11. mouths 12. families 13. ties 14. tomatoes 15. pianos 16. babies 17. teeth 18. countries 19. keys 20 potatoes 21. matches 22. boxes 23. hours 24. heroes 二用冠词a, an, the 或some , any 填空, 如果不需要,则用/ 代替. 1. Alice is _an___ air-hostess. Her father is __an__ engineer and her mother is ___a__ housewife. They all play __/____ tennis very well. 2. He has __an__ uncle and his uncle lives in __the__ United Kindom. He first saw him in __the__ autumn of 1978. 3. It is better to tell ___the___ truth than to tell ___/____ lies. 4. Will you have ____/__ more tea There’s plenty in the pot. 5. There is __a_university near my home. Every Saturday evening,_some__ students hold ___a_ party. _Some__ are dancing, _some___ are singing. They make a lot of noise. 6. Get me ____some____ cigarettes, please. ____Any__ kind will do. 7. We need __some___ ink, is there __any___ left 三用适当介词填空. 1. Can you see the words written ____ on ____ the blackboard (in, on, by, with)
英语新课程标准测试题 学校____________ 姓名____________ 一、填空题（30分每小题2分） 1、语言技能主要包括_______、说、_______、写等四个方面的技能以及这些技能的综合运用。 2、英语语言知识主要含：语音、词汇、_______、功能和话题。 3、整个基础教育阶段的英语课程（包括义务教育和高中两个阶段）按照能力水平分为_______个级别。 4、能借助图片读懂简单的故事或者小短文是新课标中____________的目标要求。 5、语言技能一级目标中说唱要求的第一个要求是__________________。 6、学习策略：认知策略，____________，___________ ，资源策略。 7、义务教育阶段的英语课程具有_______和_______双重性质。 8、教材编写应体现以下四个原则：思想性原则、_______、趣味性原则、_____ __。 9、课程资源开发与利用建议：开发与利用教材资源；开发与利用学校资源；开发与利用网络资源；开发与利用_______ 资源。 10、英语课程的评价要尽可能做到评价主体的多元化，评价形式和内容的_____ __，评价目标的多维化。 11、评价体系包括___________和终结性评价 12、评价要__________、反馈教学、促进教学。 13、综合语言运用能力的形成建立在___________、___________,情 感态度、学习策略和文化意识等方面整体发展的基础之上。 14、形成性评价可采用多种方式，如测试与非测试、教师评价、_________与学生互评相结合等。 15、______级为6年级结束时应达到的基本要求，______级为9年级结束时应达到的基本要求。 二、简答题（30分） 1、简述义务教育阶段英语课程的总体目标。 2、英语课程标准的基本理念是什么？
弱电解质的电离平衡单元 测试题 Prepared on 24 November 2020
《弱电解质的电离平衡》单元测试题 一、单选题（每小题2分，共48分） 1、下列物质是电解质的是（） A、稀硫酸 B、氯化钠 C、酒精 D、铜 2、下列物质的水溶液能导电，但属于非电解质的是（） A、CH3CH2COOH B、Cl2； C、NH4HCO3； D、SO2 3、下物质分类组合正确的是（） 4、下列叙述中,能说明某化合物一定是弱电解质的是（） A、该化合物水溶液不导电； B、该化合物饱和溶液导电能力较弱 C、该化合物在熔融时不导电； D、该化合物溶于水中发生电离,溶质离子浓度小于溶质分子浓度 5、关于强弱电解质的导电性的正确说法是（） A、由离子浓度决定； B、导电性基本没有差别； C、强电解质溶液导电能力强，弱电解质溶液导电能力弱； D、导电性强的溶液里自由移动的离子数目一定比导电性弱的溶液里自由移动的离子数目多 6、某固体化合物A不导电，但熔化或溶于水都能完全电离，下列关于A的说法中正确的是（）
A、A为非电解质 B、A是强电解质 C、A是分子晶体 D、A为弱电解质 7、下列反应的离子方程式可用H++OH-=H2O表示的有（） A、盐酸和氨水反应 B、稀硝酸和氢氧化钾溶液反应 C、碳酸氢钠溶液和氢氧化钠溶液反应 D、硫酸溶液和氢氧化钡溶液反应 8、把固体分别加入到下列100mL液体中，溶液导电性基本不变，该液体是（） A、自来水 B、L盐酸 C、L醋酸 D、L氨水 9、下列说法正确的是（） A、强酸、强碱都是强电解质； B、可溶性碱都是强电解质； C、不溶于水的化合物都是弱电解质或非电解质； D、能导电的物质都是电解质 10、下列说法正确的是（）A、强电解质的稀溶液中不存在溶质分子； B、强电解质溶液一定比弱电解质溶液的导电性强； C、强电解质都是离子化合物，而弱电解质都是共价化合物； D、不同的弱电解质只要物质的量浓度相同，电离程度也相同； 11、下列关于弱电解质的说法中正确的是（）A、弱电解质需要通电才能发生电离； B、醋酸溶液达到电离平衡时，不存在CH 3COO-+H+CH3COOH； C、H2SO4是共价化合物，所以它是弱电解质；NaOH是离子化合物，所以它是强电解质； D、弱电解质溶液中，既有溶质分子，又有溶质电离出来的离子； 12、一定量的盐酸跟过量的铁粉反应时，为了减缓反应速度，且不影响生成的氢气总量。可向盐酸中加入适量的（） A、NaOH（固体）； B、H2O； C、NH4NO3（溶液）； D、NaCl（固体）；
19.We were all surprised when he made it clear that he ____ office soon. （得分：1分） A) leaves B) left C) had left D) would leave 20.I had my hair cut at the _____ around the corner.（得分：1分） A) barber’s B) barbers’ C) barber D) barbers 21.During sleep blood pressure is normally ______ its lowest. （得分：1分）
A) for B) at C) by D) in 22.Many people have found _______ uncomfortable to hold the same position for a long time. （得分：1分） A) that B) which C) this D) it 23.If he had followed the doctor’s advice, he ____ quite all right now. （得分：1分） A) would be B) would have been C) is D) to
24.I have no objection _____ your story again.（得分：1分） A) to hear B) to having heard C) to hearing D) to have heard 25.At the sound of the gun, the birds flew ____ all directions.（得分：1分） A) by B) from C) to D) in 26.The ______ about nuclear energy revolves around the waste problem.（得分：1分） A) public’s chief concern B) chief public concern C) public chief concern
Unit 1 一. 单项填空 1．--- Mary’s got crazy and has been sent to the mental hospital. Did you tell her boss about that? --- Yes, but I _____ her husband first. A. should have told B. shouldn’t have told C. must have told D. needn’t have told 2．There was ______ time _____ Chinese used foreign oil. A. a; when B. a; while C. /; when D. /; while 3．It was because of bad weather __________ the football match had to be put off. A. so B. so that C. why D. that 4. --- Look! The telephone is broken. Someone damaged it ________ purpose. ---That may be right. But perhaps it was broken _________ accident. A. on; by B. by; by C. on; on D. by; on 5. What great trouble we had ___________ where his house was. A. in finding B. to find C. find D. found 6.Some students have trouble _____ grammar while others have difficulty______ new words. A. in; remember B. for; to remember C. on; remembering D. with; remembering 7. I cannot spend ________ money on the car which is ________ expensive for me. A. too much; much too B. far too; too much C. much too; too much D. too many; much too 8. catch the first bus, he got up very early this morning. A. In order to B. In order that C. So as to D. So that 9. There are altogether 6 people in the room, the baby________. A. include B. including C. included D. to include 10. The manager of the factory told us that very little ______ was made of the waste material in the past. A. cost B. value C. use D. matter 11. There is no ______ swimming-pool in this school and the students often go to swim ______. A. indoors; outdoors B. indoor; outdoor C. indoor; outdoors D. indoor; indoors 12. It is the first time that I _______ this kind of moon cake. A. enjoyed B. have enjoyed C. enjoy D. enjoying 13. When was it _____ your mother showed you around the West Lake ？ A. until B. if C. which D. that 14. In the reading room, we found her _______ at a desk, with her attention ______ on a book. A. sitting; fixing B. to sit; fixed C. seating; fixing D. seated; fixed 15. I’m glad you’ve come; I am _______ telephoning you. A. at the point of B. to the point of C. on the point of D. in the point of 二：完型 You Did More Than Carry My Books Mark was waking home from school one day when he noticed the boy ahead of him had dropped all of the books he was carrying, along with a baseball bat and several other things. Mark 16 down and helped the boy pick up these articles. _17 they were going the same way, he helped to carry some of them for him. As they walked Mark _18 the boy’s name was Bill, that he 19 computer games, baseball and history, that he was having a lot of _20 with his other subjects and that he had just broken 21 with his girlfriend. 1
I. Fill in the blanks in the following sentences with the words given below. （答案填写单词前的大写字母编号。每空2分，共20分） 1. As a teacher he was highly respected for his industry, patience, and his ability to F knowledge. 2. Unless a firm can J its products and services to remain ahead of the competition, the margin of profitability will be significantly reduced, with an attendant loss of market share. 3. Depressed people can of course make G and unwise decisions, and I made one such decision when, during my second term at Berkeley, I decided to give up my London flat. 4. He wrote to them, wishing every one of them and their families a truly Happy Christmas and a very H /K New Year. (H和K两个选项一样。) 5. About three years ago, she started reading E about her grandfather because she wanted to learn the truth for herself. 6. For health reasons the president has decided to A his planned visit to Italy. 7. This book is the product of several years of B between two leading universities. 8. The new club strives to educate its members to I service to the community. 9. Though he didn’t have much to give, he was C with his money. 10. Father’s Day is a day on which the people of many countries express their D and appreciation for their fathers by giving them gifts or greeting cards. II. Fill in the blanks in the following sentences with the phrases or expressions given below. （答案填写词组前的大写字母编号。每空2分，共20分） 1. I don’t want to scare you unnecessarily, but you Q face facts. 2. As four days of talks M , the opposing sides were still unable to agree on a temporary ceasefire in the region. 3. The only thing on sale that N was a little French clock. 4. For better health you must S eating too much. 5. The UN Secretary General believes that if member countries would act O , the problem might be solved more easily. 6. The doctor asked her to try to keep drinking to a minimum while she is pregnant, K her own health and her baby’s. 第一页
离子方程式练习题 一判断下列离子方程式是否正确。 1.下列离子方程式正确的是（） A．向Ba(OH)2溶液中滴加NH4HSO4溶液至刚好沉淀完全： Ba2++2OH－+NH4++H++SO42－=BaSO4↓+NH3·H2O+ H2O B．H218O中投入Na2O2固体：2H218O＋2O22-＝4OH-＋18O2 C．硫氢化钠水解HS-+H 2O H2S↑+OH- D．用石墨作电极电解AlCI3溶液：2Cl－＋2H2O Cl2↑＋H2↑＋2OH－ 2. 下列离子方程式书写正确的是( ) A．次氯酸钙溶液中通入足量SO2：Ca2++C1O—+SO2+H2O=CaSO4+C1—+2H+ B．等体积、等浓度的硫酸铁溶液与氢氧化钡溶液混合 Fe3++SO42—+Ba2++3OH—=Fe（OH）3↓+BaSO4↓ C．醋酸铵溶于水：CH 3COO—+NH4++H2O CH3COOH+ NH3·H2O D．Ca(HCO3)2溶液与过量NaOH溶液反应：Ca2++HCO3-+OH-=CaCO3↓+H2O 3. 下列反应的离子方程式错误的是（） A．氯化铝溶液中加入过量的氨水：Al3+ + 4NH3?H2O == AlO2- + 4NH4+ + 2H2O B．用氨水吸收过量的二氧化硫NH3?H2O + SO2 == NH4+ + HSO3- C．向苯酚钠溶液中通入少量的二氧化碳C6H5O- + CO2+ H2O == C6H5OH+ CO32－ D．次氯酸钙溶液中通入过量的二氧化碳ClO- + CO2 + H2O == HCO3- + HClO 4. 下列离子方程式错误的是（） A. 等物质的量氨气通入到稀磷酸溶液中NH3+H3PO4=NH4++H2PO4- B. Ba(OH)2溶液与H2SO4溶液反应：Ba2++2OH-+2H++SO42-=BaSO4↓+ 2H2O C FeCl3溶液中通入H2S气体：2Fe3++S2-=2Fe2++S↓ D. FeCl3溶液中加入过量氨水：Fe3++3NH3·H2O=Fe（OH）3↓+3NH4+ 5. 下了离子方程式不正确的是（） A 硫酸铝溶液中加入过量氢氧化钠：Al3++4OH-=AlO2-+2H2O B. 把少量的氯气通入到FeI2的溶液中2I－＋CI2=I2＋2CI－. C. 氟气通入氯化钠溶液中：F2+2Cl-=2F-+Cl2 D 偏铝酸钠溶液中滴入过量盐酸：AlO2-+4H+=Al3++2H2O 6. 下列结合实验现象的反应方程式正确的是（） A．切开的金属Na暴露在空气中，光亮表面逐渐变暗2Na+O2=Na2O2 B．向AgC1悬浊液中滴加Na2S溶液，白色沉淀变成黑色2AgC1+S2-=Ag2S↓+2C1- C．Na2O2在潮湿的空气中放置一段时间，变成白色粘稠物2Na2O2=2Na2CO3+O2 D．向NaHCO3溶液中加入过量的澄清石灰水，出现白色沉淀2HCO3-+Ca2++2OH-=CaCO3↓+CO32-+2H2O 二：书写下列离子方程式： （1）Cl2通入NaOH溶液中：； （2）CuSO4溶液与K2S溶液混合：； （3）Al2O3与NaOH溶液：； （4）Fe3O4溶于硝酸：； （5）Na2SiO3溶液中通入过量的CO2：； （6）小苏打与醋酸反应：； （7）3mL0.4mol/L的Ba(OH)2溶液中滴入12mL0.2mol/L的H3PO4： ；
大学英语二级考试模拟试题 第一部分：听力理解 第一节听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒的时间来回答关小题和阅读下一小题。每段对话仅读一遍。 例如，你将听到以下内容： M: Excuse me. Can you tell me how much the shirt is? W: Yes, it's nine fifteen. 请看选项： How much is the shirt? ［A］19.15 ［B］9.15 ［C］9.18 衬衫的价格为9镑15便士，所以你选择B项，并在试卷上将其标出。 Answer: ［A］［B］［C］ 1 Where does this conversation most probably take place? ［A］In a shop. ［B］At a hotel. ［C］In a travel agency. 2 What can we learn from this conversation? ［A］British food price is very high. ［B］The woman usually eats in restaurants. ［C］Food in restaurants is expensive in Britain. 3 How does this man and woman travel? ［A］By car. ［B］By train. ［C］By ship. 4 What can we learn from this conversation? ［A］The man is going to Chicago by Airlines Flight 514. ［B］Lucy is going to fly to Chicago. ［C］Lucy is seeing the man off at the airport. 5 Who is the host? ［A］Barbara. ［B］Anna. ［C］Jack. 第二节听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听第6段材料，回答6、7题。 6 Where does this conversation take place? ［A］In a store. ［B］In the dining hall.
姓名 高一英语测试卷 （选择题答案写在题目后面的表格里） 一,选择填空。(共20小题；每小题1分,满分20分)从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 1. Look at the timetable. Hurry up! Flight 4026 off at 18∶20. A. takes B. took C. will be taken D. has taken 2. I was late this morning because my alarm clock failed to . A. turn off B. take off C. go off D. set off 3. Look! The children ___ trees on the hill. A. is playing B. will plant C. are planting D. planted 4.This kind of work ______ a lot of time, so you need to start now. A. takes up B. pays for C. looks for D. gives out 5. Don’t make any noises. We ____ to music. A. listened B. is listening C. are listening D. have listened 6. --- May I speak to Mr. Smith please? --- I’m sorry he is not here ______. Please call him later. A. in the moment B. at the moment C. for a moment D. in a moment 7. The school is near my house. So my sister often _________ to school. A. walk B. walks C. is walking D. is walk 8. It was ____ cold that they had to put on more clothes. A. such a B. such C. so D. so a 9. Jack ________ doing his homework at seven every evening. A. finish B. will finish C. finishes D. had finished 10. Remember _____ the lights when you leave the house. A. to switch off B. turning off C. to switch on D. turning on 11. He said the sun ____in the east and ____in the west. A. rose; set B. rises; sets C. rises, set D. rise; sets 12. Don’t worry. I will make a phone c all to you as soon as I Beijing. A. will reach B. am reaching C. reach D. am going to reach 13. --- What do you think about that TV programme? --- Oh, It’s so boring. . A. sure B. I hate to see it C. I enjoy it D. I like it 14. With the address,I had no in finding the old man’s house. A.idea B. time C. help D . difficult 15. --- What would you do if it ______ tomorrow ? --- We have to carry it on , since we’ve got everything ready . A. rain B. rains C. will rain D. is raining 16. Study hard________ you will not pass the final examination. A．but B．so C．however D．otherwise 17. It ______ me about an hour to read English aloud every morning. A. spends B. costs C. takes D. pays 18. They found the text_______ to understand A. bored B. difficult C. interested D. difficultly 19. I don’t like Tom because he _____ those in trouble without giving a hand to them.
英语测试题及答案 为大家收集的英语测试题及答案，仅供参考，大家一起来看看吧。 英语测试题及答案1 I. 单项选择(15分) 1. Mr Johnson _________ a child at the start of the 1950s. A. is B. are C. was D. were 2. -How about the young lady? -It’s hard to say, but her voice _________ beautiful. A. sounds B. hears C. listens D. smells 3. The temperature was below zero. It was difficult to _________ the car. A. move B. got C. begin D. start 4. John Lennon and Paul _________ the main songwriters of the Beatles in 1960s. A. are B. is C. was D. were 5. -What do you usually do on Sundays? -We _________ at the guitar group. A. enjoy B. have good times C. enjoy ourselves D. like ourselves 6. -May I help you with some jeans, sir? -Yes, I’d like to try on the blue _________. A. pair B. one C. two D. ones 7. More and more people in Beijing can talk and write _________
班别：姓名：座号： 水溶液中的离子平衡测试题 一、选择题：（每小题3分，共48分，每小题有．1．个或 ．．2．个．正确选项。）1．水是一种极弱的电解质，在室温下，平均每n个水分子中只有1个水分子发生了电离，则n的值是（）A．1×10-14B．55.6×107C．107D．55.6 2．下列溶液一定是碱性的是（）A．pH＝8的某电解质的溶液B．c(OH-)＞1×10-7mol/L C．溶液中含有OH-D．溶液中c(OH-)＞c(H+) 3．已知某温度下，四种一元弱酸的电离平衡常数为：K a(HCN)＝6.2×10-10mol/L、K a(HF)＝6.8×10-4mol/L、K a(CH3COOH)＝1.8×10-5mol/L、K a(HNO2)＝6.4×10-6 mol/L。物质的量浓度都为0.1 mol/L的下列溶液中，pH最小的是（）A．HCN B．CH3COOH C．HF D．HNO2 4．0.1 mol/L K2CO3溶液中，若使c(CO32-)更接近0.1 mol/L，可采取的措施是（）A．加入少量盐酸B．加KOH固体C．加水D．加热 5．在已达到电离平衡的0.1mol/L的醋酸溶液中，欲使平衡向电离的方向移动，同时使溶液的pH 降低，应采取的措施是（）A．加少量盐酸B．加热C．加少量醋酸钠晶体D．加少量水6．将足量的BaCO3粉末分别加入下列溶液中，充分溶解至溶液饱和。各溶液中Ba2+的浓度最小的为（）A．10 mL 0.2 mol/LNa2CO3溶液B．40 mL水 C．50 mL 0.01 mol/L 氯化钡溶液D．100 mL 0.01 mol/L盐酸 7．下列有关滴定操作的顺序正确的是（） ①检查滴定管是否漏水；②用蒸馏水洗涤玻璃仪器；③用标准溶液润洗盛装 标准溶液的滴定管，用待测液润洗盛待测液的滴定管；④装标准溶液和待测液并调整液面（记录初读数）；⑤取一定体积的待测液于锥形瓶中；⑥滴定操作
2018年9月15日英语二级考试真题 第一节 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 1. What is the woman going to do this afternoon? A. Eat out. B. See a doctor. C. Go shopping. 2. How does Henry feel now? A. Proud. B. Tired. C. Grateful. 3. What did Fred do? A. He travelled to Italy. B. He offered Kate a ride. C. He bought a new car. 4. What does the woman do? A. She’s a salesperson. B. She’s a librarian. C. She’s a bank clerk. 5. What did Patrick do last Friday? A. He moved to another place. B. He sold his old apartment. C. He went out with a friend 第二节 听下面5段对话或独白。每段对话或独白后有2至4个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听下面一段对话，回答第6和第7题。 6. What is the probable relationship between the speakers? A. Strangers. B. Classmates. C. Co-workers. 7. Why is Sara worried? A. She has problem preparing for a speech. B. She knows nothing about British history. C. She fails to finish her homework on time. 听下面一段对话，回答第8至第10题。
2021年高一上学期模块一测试英语试题含答案 I. 听力（共两节，满分30分） 第一节（共5小题；每小题1.5分，满分7.5分） 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 1. In which season does it often rain? A. In the summer. B. In the winter. C. In the autumn. 2. What are they going to do? A. To do something at home. B. To go out to do something. C. To have dinner at a restaurant. 3. What did the woman say? A. She has been to Germany. B. She has been to America? C. She is going to America. 4. Where does this conversation take place? A. In a supermarket. B. At home. C. In a bookshop.
5. What is the weather going to be like? A. It is supposed to be warm. B. The rain is not expected to last long. C. It’s l ikely to be cloudy and cold. 第二节（共15小题；每小题1.5分，满分22.5分） 听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C 三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听第6段材料，回答第6至8题。 6. Where is the woman going? A. To the post office. B. To the museum. C. To the fruit shop. 7. How can she find the bridge? A. Go down the street and turn left. B. Go down the street and turn right. C. Go straight forward along the street. 8. How long will it take the woman to get there?
This is my pencil ? (一般疑问句) These red socks are Kate’s .(一般疑问句) Mary does not have any books .(肯定句) The clothing shop is on sale .(否定句) She likes the bag very much .(否定句) I buy the pants for only 50 Yuan. (用she改写句子) Her dog is 2 years and 5 months old. (否定句) I often get up at seven o’clock .(用he改写句子) He often has rice for dinner. (一般疑问句) My sister wants to see the comedy. (一般疑问句) I think this story is boring. (复数句） Ann and her mum may live in the same city.(一般疑问句) She doesn’t know when to join the band . (肯定句) She often has a drink of water after supper . (一般疑问句) That is an apple tree . (复数句) 二．be动词的适当形式填空。 I ______ a student. You ______ a teacher. She ______ my friend. ______ you Li Fen ? No, I ______ not. ______ Mr. green very busy? Yes, he ______. He must ______ at home . Comedy ______ very interesting . ______ thrillers very scary? You and I ______ good friends. His friends ______ very funny. The twins ______ very happy because they want to go to a movie. Our class ______ big, but their class ______ small. The basketball club ______ exciting and fun. The girl in red clothes ______ my sister. Lily’s room ______ not very big. It _______ nice to meet you. Your name _______ nice. What class ______ you in? ________ your Number Seven? 三．用所给动词的适当形式填空。 My classmate ______ (know) the man on the bike. His sister usually ______ (go) to school at 7:00 am. Lin Tao ______ (like) his new sweater. Let me ______ (have) a look. Let’s ______ (play) tennis! ______ he ______ (like) English? I want ______ (go) to a movie. He ______ (not know) the teacher’s name. Nice ______ (meet) you!