限时训练(五)

合集下载

第5讲功功率动能定理(限时训练)

高三物理限时规范训练（五）功功率动能定理(时间：60分钟满分：100分)姓名成绩一、选择题(本题共9个小题，每小题6分，共54分，在每小题给出的四个选项中，第1～5题只有一个选项符合要求，第6～9题有多项符合要求．)1．(2014·盐城模拟)如图所示，一质量为M ，长为L 的木板，放在光滑的水平地面上，在木板的右端放一质量为m 的小木块，用一根不可伸长的轻绳通过光滑的定滑轮分别与m 、M 连接，木块与木板间的动摩擦因数为μ，开始时木块和木板静止，现用水平向右的拉力F 作用在M 上，将m 拉向木板左端的过程中，拉力至少做功为( )A ．2μmgLB .12μmgL C ．μ(M ＋m)gL D ．μmgL2．质量均为m 的两物块A 、B 以一定的初速度在水平面上只受摩擦力而滑动，如图所示是它们滑动的最大位移x 与初速度的平方v 20 的关系图象，已知v 202＝2v 201，下列描述中正确的是( )A ．若A 、B 滑行的初速度相等，则到它们都停下来时滑动摩擦力对A 做的功是对B 做功的2倍 B ．若A 、B 滑行的初速度相等，则到它们都停下来时滑动摩擦力对A 做的功是对B 做功的12C ．若A 、B 滑行的最大位移相等，则滑动摩擦力对它们做的功相等D ．若A 、B 滑行的最大位移相等，则滑动摩擦力对B 做的功是对A 做功的2倍3．两个物体A 、B 的质量分别为m 1、m 2，并排静止在水平面上，用相同的水平拉力F 同时分别作用于物体A 和B 上，分别作用一段时间后撤去，两物体各自滑行一段距离后停止．两物体A 、B 运动的v －t 图象分别如图中a 、b 所示．已知拉力F 撤去后，物体做减速运动过程的v －t 图象彼此平行(相关数据如图所示)．由图中信息可以得到( )A ．m 1＜m 2B ．t ＝3 s 时，物体A 、B 再次相遇C ．拉力F 对物体A 所做的功较多D ．拉力F 对物体A 的最大瞬时功率是对物体B 最大瞬时功率的45倍4．(2014·上海市七校调研联考)把动力装置分散安装在每节车厢上，使其既具有牵引动力，又可以载客，这样的客车车辆叫做动车．几节自带动力的车辆(动车)加几节不带动力的车辆(也叫拖车)编成一组，就是动车组，假设动车组运行过程中受到的阻力与其所受重力成正比，每节动车与施车的质量都相等，每节动车的额定功率都相等．若1节动车加3节拖车编成的动车组的最大速度为120 km /h ；则6节动车加3节拖车编成的动车组的最大速度为( )A ．120 km /hB ．240 km /hC ．320 km /hD ．480 km /h5．如图所示，图线表示作用在某物体上的合外力随时间变化的关系，若物体开始时是静止的，那么( )A ．从t ＝0开始，5 s 内物体的动能变化量为零B ．在前5 s 内只有第1 s 末物体的动能最大C ．在前5 s 内只有第5 s 末物体的速率最大D ．前3 s 内合外力对物体做的功为零6．(2014·黑龙江省牡丹江市联考)如图所示，光滑固定的竖直杆上套有小物块a ，不可伸长的轻质细绳通过大小可忽略的定滑轮连接物块a 和小物块b ，虚线cd 水平．现由静止释放两物块，物块a 从图示位置上升，并恰好能到达c 处．在此过程中，若不计摩擦和空气阻力，下列说法正确的是( )A ．物块a 到达c 点时加速度为零B ．绳的拉力对物块a 做的功等于物块a 重力势能的增加量C ．绳的拉力对物块b 先做负功后做正功D ．绳的拉力对物块b 做的功等于物块b 机械能的减少量7．(2014·河南名校质检)低碳、环保是未来汽车的发展方向．某汽车研发机构在汽车的车轮上安装了小型发电机，将减速时的部分动能转化并储存在蓄电池中，以达到节能的目的．在某次测试中，汽车以额定功率行驶一段距离后关闭发动机，测出了汽车动能E k 与位移s 的关系图象如图，其中①是关闭储能装置时的关系图线，②是开启储能装置时的关系图线．已知汽车的质量为1 000 kg ，设汽车运动过程中所受地面阻力恒定，空气阻力不计．根据图象所给的信息可求出( )A ．汽车行驶过程中所受地面的阻力为1 000 NB ．汽车的额定功率为80 kWC ．汽车加速运动的时间为22.5 sD ．汽车开启储能装置后向蓄电池提供的电能为5×105 J8.(2014·武汉调研)为减少二氧化碳排放，我国城市公交推出新型节能环保电动车，在检测某款电动车性能的实验中，质量为 8×102kg 的电动车由静止开始沿平直公路行驶，达到的最大速度为15 m /s ，利用传感器测得此过程中不同时刻电动车的牵引力F 与对应的速度v ，并描绘出F －1v 图象(图中AB 、BO 均为直线)，假设电动车行驶中所受的阻力恒定，则( )A ．在全过程中，电动车在B 点时速度最大 B ．BA 过程电动车做匀加速运动C ．CB 过程电动车做减速运动D ．CB 过程电动车的牵引力的功率恒定9．质量为m 的物体静止在光滑水平面上，从t ＝0时刻开始受到三种水平力的作用，物体的加速度大小a 与时间t 的关系如图所示，力的方向保持不变，则( )A ．这三种情况下，力做功之比为W A ∶WB ∶WC ＝16∶22∶25 B ．这三种情况下，力做功之比为W A ∶W B ∶W C ＝16∶144∶25 C ．t 0时刻，力做功的瞬时功率之比为P A ∶P B ∶P C ＝16∶9∶1D ．t 0时刻，力做功的瞬时功率之比为P A ∶P B ∶P C ＝4∶3∶1二、计算题(本题共3个小题，共46分，解答时应写出必要的文字说明、方程式和演算步骤，有数值计算的要注明单位)10．(15分)(2014·广东省江门市模拟)如图所示，滑块质量为m ，与水平地面间的动摩擦因数为0.1，它以v 0＝3gR 的初速度由A 点开始向B 点滑行，AB ＝5R ，并滑上光滑的半径为R 的14圆弧BC ，在C 点正上方有一离C 点高度也为R 的旋转平台，沿平台直径方向开有两个离轴心距离相等的小孔P 、Q ，旋转时两孔均能达到C 点的正上方．若滑块滑过C 点后从P 孔上升又恰能从Q 孔落下，求：(1)滑块在B 点时对轨道的压力大小； (2)平台转动的角速度ω应满足什么条件？11．(15分)(2014·安徽省黄山市模拟)如图所示为放置在竖直平面内游戏滑轨的模拟装置，滑轨由四部分粗细均匀的金属杆组成，其中倾斜直轨AB 与水平直轨CD 长均为L ＝3 m ，圆弧形轨道APD 和BQC 均光滑，AB 、CD 与两圆弧形轨道相切，BQC 的半径为r ＝1 m ，APD 的半径为 R ＝2 m ，O 2A 、O 1B 与竖直方向的夹角均为θ＝37°.现有一质量为m ＝1 kg 的小球穿在滑轨上，以E k 0的初动能从B 点开始沿AB 向上运动，小球与两段直轨道间的动摩擦因数均为μ＝13，设小球经过轨道连接处均无能量损失．(g ＝10 m /s 2，sin 37°＝0.6，cos 37°＝0.8)求：(1)要使小球能够通过弧形轨道APD 的最高点，初动能E k 0至少多大？ (2)求小球第二次到达D 点时的动能；(3)小球在CD 段上运动的总路程．(第(2)(3)两问中的E k 0取第(1)问中的数值)12．(16分)(2013·高考四川卷)在如图所示的竖直平面内，物体A 和带正电的物体B 用跨过定滑轮的绝缘轻绳连接，分别静止于倾角θ＝37°的光滑斜面上的M 点和粗糙绝缘水平面上，轻绳与对应平面平行．劲度系数k ＝5 N /m 的轻弹簧一端固定在O 点，一端用另一轻绳穿过固定的光滑小环D 与A 相连，弹簧处于原长，轻绳恰好拉直，DM 垂直于斜面．水平面处于场强E ＝5×104N /C 、方向水平向右的匀强电场中．已知A 、B 的质量分别为m A ＝0.1 kg 和m B ＝0.2 kg ，B 所带电荷量q ＝＋4×10－6C ．设两物体均视为质点，不计滑轮质量和摩擦，绳不可伸长，弹簧始终在弹性限度内，B 电荷量不变．取g ＝10 m /s 2，sin 37°＝0.6，cos 37°＝0.8.(1)求B 所受静摩擦力的大小；(2)现对A 施加沿斜面向下的拉力F ，使A 以加速度a ＝0.6 m /s 2开始做匀加速直线运动．A 从M 到N 的过程中，B 的电势能增加了ΔE p ＝0.06 J ．已知DN 沿竖直方向，B 与水平面间的动摩擦因数μ＝0.4.求A 到达N 点时拉力F 的瞬时功率．。

高二年级限时训练五

高二年级限时训练五一、阅读选择ABefore birth,babies can tell the difference between loud sounds and voices.They can even distinguish their mother’s voice from that of a female stranger.But when it comes to embryonic learning(胎教),birds could rule the roost.As recently reported in The Auk:Ornithological Advances,some mother birds may teach their young to sing even before they hatch(孵化).New-born chicks can then imitate their mom’s call within a few days of entering the world.This educational method was first observed in2012by Sonia Kleindorfer,a biologist at Flinders University in South Australia,and her colleagues.Female Australian superb fairy wrens were found to repeat one sound over and over again while hatching their eggs.When the eggs were hatched,the baby birds made the similar chirp to their mothers—a sound that served as their regular＂feed me!＂call.To find out if the special quality was more widespread in birds,the researchers sought thered-backed fairy wren,another species of Australian songbird.First they collected sound data from67nests in four sites in Queensland before and after hatching.Then they identified begging calls by analyzing the order and number of notes.A computer analysis blindly compared calls produced by mothers and chicks,ranking them by similarity.It turns out that baby red-backed fairy wrens also emerge chirping like their moms.And the more frequently mothers had called to their eggs,the more similar were the babies’begging calls. In addition,the team set up a separate experiment that suggested that the baby birds that most closely imitated their mom’s voice were rewarded with the most food.This observation hints that effective embryonic learning could signal neurological(神经系统的)strengths of children to parents.An evolutionary inference can then be drawn.＂As a parent, do you invest in quality children,or do you invest in children that are in need?＂Kleindorfer asks.＂Our results suggest that they might be going for quality.＂1.The underlined phrase in Paragraph1means＂____________＂.A.be the worstB.be the bestC.be just as badD.be just as good2.What are Kleindorfer’s findings based on?A.Similarities between the calls of moms and chicks.B.The observation of fairy wrens across Australia.C.The data collected from Queensland’s locals.D.Controlled experiments on wrens and other birds.3.Embryonic learning helps mother birds to identify the baby birds which____________.A.can receive quality signalsB.are in need of trainingC.fit the environment betterD.make the loudest callBA new commodity brings about a highly profitable,fast-growing industry,urging antitrust(反垄断)regulators to step in to check those who control its flow.A century ago,the resource in question was oil.Now similar concerns are being raised by the giants(巨头)that deal in data,the oil of the digital age.The most valuable firms are Google,Amazon,Facebook and Microsoft.All look unstoppable.Such situations have led to calls for the tech giants to be broken up.But size alone is not a crime.The giants’success has benefited consumers.Few want to live without search engines or aquick delivery.Far from charging consumers high prices,many of these services are free(users pay,in effect,by handing over yet more data).And the appearance of new-born giants suggests that newcomers can make waves,too.But there is cause for concern.The internet has made data abundant,all-present and far more valuable,changing the nature of data and competition.Google initially used the data collected from users to target advertising better.But recently it has discovered that data can be turned into new services:translation and visual recognition,to be sold to other companies.Internet companies’control of data gives them enormous power.So they have a"God’s eye view"of activities in their own markets and beyond.This nature of data makes the antitrust measures of the past less useful.Breaking up firms like Google into five small ones would not stop remaking themselves:in time,one of them would become great again.A rethink is required—and as a new approach starts to become apparent,two ideas stand out.The first is that antitrust authorities need to move from the industrial age into the21st century. When considering a merger(兼并),for example,they have traditionally used size to determine when to step in.They now need to take into account the extent of firms’data assets(资产)when assessing the impact of deals.The purchase price could also be a signal that an established company is buying a new-born threat.When this takes place,especially when a new-born company has no revenue to speak of,the regulators should raise red flags.The second principle is to loosen the control that providers of on-line services have over data and give more to those who supply panies could be forced to reveal to consumers what information they hold and how much money they make from ernments could order the sharing of certain kinds of data,with users’consent.Restarting antitrust for the information age will not be easy.But if governments don’t want a data economy controlled by a few giants,they must act soon.4.Why is there a call to break up giants?A.They have controlled the data market.B.They collect enormous private data.C.They no longer provide free services.D.They dismissed some new-born giants.5.What does the technological innovation in Paragraph3indicate?A.Data giants’technology is very expensive.B.Google’s idea is popular among data firms.C.Data can strengthen giants’controlling position.D.Data can be turned into new services or products.6.By paying attention to firms’data assets,antitrust regulators could.A.kill a new threatB.avoid the size trapC.favour bigger firmsD.charge higher prices7.What is the purpose of loosening the giants’control of data?A.Big companies could relieve data security pressure.ernments could relieve their financial pressure.C.Consumers could better protect their privacy.D.Small companies could get more opportunities.COld problem，new approachesWhile clean energy is increasingly used in our daily life，global warming will continue for some decades after CO2emissions(排放)peak.So even if emissions were to begin to decrease today，we would still face the challenge of adapting to climate change.Here I will stress somesmarter and more creative examples of climate adaptation.When it comes to adaptation，it is important to understand that climate change is a process. We are therefore not talking about adapting to a new standard，but to a constantly shifting set of conditions.This is why,in part at least，the US National Climate Assessment says that：“There is no‘one-size fits all’adaptation.”Nevertheless，there are some actions that offer much and carry little risk or cost.Around the world,people are adapting in surprising ways，especially in some poor countries. Floods have become more damaging in Bangladesh in recent decades.Mohammed Rezwan saw opportunity where others saw only disaster.His not-for-profit organization runs100river boats that serve as floating libraries，schools，and health clinics，and are equipped with solar panels and other communicating facilities.Rezwan is creating floating connectivity(连接)to replace flooded roads and highways.But he is also working at a far more fundamental level：his staff show people how to make floating gardens and fish ponds to prevent starvation during the wet season.Elsewhere in Asia even more astonishing actions are being taken.Chewang Norphel lives in a mountainous region in India,where he is known as the Ice Man.The loss of glaciers(冰川) there due to global warming represents an enormous threat to agriculture.Without the glaciers, water will arrive in the rivers at times when it can damage crops.Norphel's inspiration came from seeing the waste of water over winter,when it was not needed.He directed the wasted water into shallow basins where it froze,and was stored until the spring.His fields of ice supply perfectly timed irrigation(灌溉)water.Having created nine such ice reserves,Norphel calculates that he has stored about200，000m3of water.Climate change is a continuing process,so Norphel's ice reserves will not last forever.Warming will overtake them.But he is providing a few years during which the farmers will,perhaps,be able to find other means of adapting.Increasing Earth's reflectiveness can cool the planet.In southern Spain the sudden increase of greenhouses(which reflect light back to space)has changed the warming trend locally,and actually cooled the region.While Spain as a whole is heating up quickly,temperatures near the greenhouses have decreased.This example should act as an inspiration for all cities.By painting buildings white,cities may slow down the warming process.In Peru,local farmers around a mountain with a glacier that has already fallen victim to climate change have begun painting the entire mountain peak white in the hope that the added reflectiveness will restore the life-giving ice.The outcome is still far from clear.But the World Bank has included the project on its list of“100ideas to save the planet”.More ordinary forms of adaptation are happening everywhere.A friend of mine owns an area of land in western Victoria.Over five generations the land has been too wet for cropping.But during the past decade declining rainfall has allowed him to plant highly profitable crops.Farmers in many countries are also adapting like this—either by growing new produce,or by growing the same things differently.This is common sense.But some suggestions for adapting are not.When the polluting industries argue that we've lost the battle to control carbon pollution and have no choice but to adapt,it's a nonsense designed to make the case for business as usual.Human beings will continue to adapt to the changing climate in both ordinary and astonishing ways.But the most sensible form of adaptation is surely to adapt our energy systems to emit less carbon pollution.After all,if we adapt in that way,we may avoid the need to change in so many others.8.The underlined part in Paragraph2implies________.A.adaptation is an ever-changing processB.the cost of adaptation varies with timeC.global warming affects adaptation formsD.adaptation to climate change is challenging9.What is special with regard to Rezwan's project?A.The project receives government support.B.Different organizations work with each other.C.His organization makes the best of a bad situation.D.The project connects flooded roads and highways.10.What did the Ice Man do to reduce the effect of global warming?A.Storing ice for future use.B.Protecting the glaciers from melting.C.Changing the irrigation time.D.Postponing the melting of the glaciers.11.What do we learn from the Peru example?A.White paint is usually safe for buildings.B.The global warming trend cannot be stopped.C.This country is heating up too quickly.D.Sunlight reflection may relieve global warming.12.According to the author,polluting industries should________.A.adapt to carbon pollutionB.plant highly profitable cropsC.leave carbon emission aloneD.fight against carbon pollution13.What's the author's preferred solution to global warming?A.Setting up a new standard.B.Reducing carbon emission.C.Adapting to climate change.D.Monitoring polluting industries.二、七选五七选五根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。

高考二轮复习限时训练(五)

高考二轮复习限时训练（五）（时间：60分钟）班级姓名得分一、填空题：（12×5分=60分）1、命题“2,210x R x x ∃∈-+≤”的否定形式为．2、已知U={1，2，3，4，5，6}，集合A={2，3}，集合B={3，5}，则A ∩(U B) = ．3、0tan(1125)-的值是．4、如图所示的流程图输出的n 值是．5、若复数z 满足(2)5i z -= (i 是虛数单位)，则z= ．6、函数[]sin()(0,3y x x ππ=+∈)的单调减区间是．7、方程x x 28lg -=的根)1,(+∈k k x ，k ∈Z ，则k = ．8、已知向量(1,2),(2,3)a b == ，若()()a b a b λ+⊥-，则λ= ．9、设奇函数()f x 满足：对x R ∀∈有(1)()0f x f x ++=，则(5)f = ． 10、某城市一年中12个月的平均气温与月份的关系可近似地用三角函数)]6(6cos[-+=x A a y π(x =1，2，3，…，12）来表示，已知6月份的月平均气温最高，为28℃，12月份的月平均气温最低，为18℃，则10月份的平均气温值为 ℃．11、在等比数列{}n a 中，若22a =，632a =，则4a = ．12、在ABC ∆中,角A,B,C 所对的边分别是,,a b c ，若22b c+2a =,且a b=则∠C= ．二．解答题（每题15分，共30分）13．设向量(c o s,s i n )m θθ=，sin ,cos )n θθ= ，),23(ππθ--∈，若1m n ∙=，求：（1）)4sin(πθ+的值；（2）)127cos(πθ+的值．14.如图，四边形ABCD为矩形，AD⊥平面ABE，AE＝EB＝BC＝2，F为CE上的点，且BF⊥平面ACE．（1）求证：AE⊥BE；使得MN∥平面DAE.南师大附校09高考二轮复习限时训练（五）一、填空题1、∀x∈R，x 2－2x+l ＞0 2、{2} 3、1 4、5 5、1 6、[,]6ππ7、3 8、53- 9、0 10、20.5 11、8 12、1050二、解答题13、解：（1）依题意，cos sin )sin cos )m n θθθθ∙=+cos )θθ=+4sin()4πθ=+又1m n ∙= ∴41)4sin(=+πθ…………… ……7分（2）由于),23(ππθ--∈，则)43,45(4πππθ--∈+结合41)4s i n(=+πθ，可得415)4cos(-=+πθ 则7cos()12θπ+11cos[()]43θππ=++11(4242=-⨯-⨯8=-15分14、（1）证明： ABE AD 平面⊥，BC AD //∴ABE BC 平面⊥，则BC AE ⊥…… ……… 3分又 ACE BF 平面⊥，则BF AE ⊥ ∴BCE AE 平面⊥ 又BCE BE 平面⊂ ∴BE AE ⊥ ………………………… 6分（2）在三角形ABE 中过M 点作MG ∥AE 交BE 于G 点,在三角形BEC 中过G 点作GN ∥BC交EC 于N 点,连MN,则由比例关系易得CN ＝CE 31…… …8分MG ∥AE MG ⊄平面ADE, AE ⊂平面ADE, ∴MG ∥平面ADE ……………………10分同理, GN ∥平面ADE∴平面MGN ∥平面ADE ……………12分又MN ⊂平面MGN ∴MN ∥平面ADE∴N 点为线段CE 上靠近C 点的一个三等分点 …………………………………………15分。

高三限时训练五丁勇

依次填入下列各句横线处的词语，恰当的一组是( ) ①经历了二十多年的动乱之后，我们每一个人都会感到，假如有这样一个安宁而________的环境来读书写作，真是非常理想。 ②我现在真后悔，都怪自己一时冲动，________了国家法律，害了别人，也害了自己。 ③这部著作的第一部分为________，在这部分，作者介绍了全书的主要内容。 A．优美违反序言 B．幽美违犯绪言 C．幽美违反序言 D．优美违犯绪言 • 14．【解析】 “幽美”指幽静美丽；“优美”指美好，句中强调环境幽静，故选用“幽美”。“违犯”的程度比 “违反”重，“违犯”常常和法律法规相搭配，“违反” 常常和纪律、秩序相搭配。“序言”不属于著作的组成部分，而“绪言”则属于著作的是 A.专家认为，如果全国实行统一的药品编码，就可以建立药品信息系统及用计算机对种类繁多的药品进行科学管理打下坚实基础。 B．春节黄金周，探亲和出游的旅客大量增加，广铁集团共发送旅客305.9万人次，与去年同期相比增加23万人次，增幅为8．1％。宁可让商品积压，资金呆 C．驻伊美军虐囚丑闻公诸于世后，美国总统乔治· 布什也意识到问题的严重性，竭尽全力进行处理，以减少此事对其声望的影响。 D．工商、公安等部门将分品种、分阶段对药品、保健食品、美容服务等重点商品广告进行专项整治，以确保该项工作取得实效。
• 下列加点词语使用恰当的一项是（） A．耸人听闻的昆明暴恐案让世人震惊，世界各国爱好和平的人士无不强烈谴责这群暴徒的恶劣行径。 B．黄果树大瀑布不愧为5A景区，还没见到瀑布，就听见传来阵阵瓦釜雷鸣般的响声。 C．文学借文字表现思想情感，文字上面有含糊，就显得思想还没透彻，所以必须锱铢必较。 D．望着那悠远的夜空中闪烁的群星，他又回想起那有趣的童年，回想起小时候妈妈讲给他的许多动人的故事。 • A项“耸人听闻”意为故意说夸大或惊奇的话，使人震惊，用在此处不合语境，应改为“骇人听闻”，意指使听的人十分吃惊害怕；B项“瓦釜雷鸣”指声音低沉的沙锅发出雷鸣般的响声。比喻无德无才的人占据高位，威风一时，此处显然是望文生义，不合适； D项“悠远” 是指空间距离的辽远或指长久、久远，用在此处不合适，应改为“幽远”，意指深远。C项“锱铢必较”是形容非常小气，很少的钱也一定要计较，也比喻气量狭小，很小的事也要计较，用在这里合语境。

高二数学限时训练(五)2007.4.26

高二数学限时训练(五)(40分钟完成)(2007.4.26)一、选择题：(本大题共7小题，每小题7分,共49分.在每小题给出的四个选项中,只有一项是符合题目要求的.) 请把答案填入后面指定的空格里.1.有这样一段演绎推理是这样的“有些有理数是真分数，整数是有理数，则整数是真分数”结论显然是错误的，是因为（） (A)大前提错误 (B)小前提错误 (C)推理形式错误 (D)非以上错误 2.如果22(32)(2)z m m m m i =-+++-是纯虚数，那么实数m 的值是( ) (A )1 (B )2 (C )－2 (D )1和23.与直线32+-=x y 垂直又与曲线12+=x y 相切的直线方程为( ) (A)21y x =+ (B)132y x =-+(C) 132y x =+ (D)112y x =+4.用反证法证明命题: “设,,a b c 大于0，则1a b+、1b c+、1c a+中至少有一个不小于2.”时,假设的内容是( )(A)都不小于2 (B)至少有一个不大于2 (C)都小于2 (D)至少有一个小于2 5.用数学归纳法证明不等式“*1111(2)2321nn n n N ++++<∈- ≥，,的过程中，当由n k =变到1n k =+时，左边增加了（） (A)1项 (B)k 项 (C)12k -项 (D)2k 项6.由直线4y x =-，曲线x y 2=以及x 轴所围成的图形面积为（） (A)13 (D)157.设f (x )=x si nx ,若x 1, x 2∈[,],22ππ-且f (x 1)>f (x 2),则下列结论中必成立的是 ( )(A )x 1>x 2 (B )x 1+x 2>0 (C)x 1<x 2 (D)x 12>x 22二、填空题: 本大题共3小题,每小题7分,共21分,把答案填在题中横线上. 8.若数列{}n a 的通项公式)()1(12+∈+=N n n a n ，记)1()1)(1()(21n a a a n f -⋅⋅⋅--=，试通过计算)3(),2(),1(f f f 的值，推测出()______.f n =9.半径为r 的圆的面积()2S r r π=，周长()2C r r π=，若将r 看作（0,+∞）上的变量，则()()S r C r '=①即圆的面积函数的导数等于圆的周长函数.对于半径为R 的球，若将R 看作（0，+∞）上的变量，请你写出类似①式的结论：＿＿＿＿＿_②即 .10.已知两条相交直线最多有1个交点，三条直线最多有3个交点，四条直线最多有6个交点点，五条直线最多有10个交点．由此可归纳n 条直线最多交点个数为．班别8.______; 9._____________,__________________________________; 10.___________. 三、解答题: 本大题共两小题，每小题15分,共30分,解答应写出文字说明,证明过程或演算步骤.11.已知：23150sin 90sin 30sin 222=++ , 23125sin 65sin 5sin 222=++通过观察上述两等式的规律，请你猜想出一般性的命题，并证明你的猜想12.如图：在正三棱柱111C B A ABC -中，1BB E ∈，截面11AC EC A 侧面⊥.①求证：1EB BE =;②若111B A AA =, 求平面EC A 1与平面111C B A 所成二面角(锐角)的度数.(注意:在下面横线上填写适当内容,使之成为①②的完整证明.) ①证明：如图,在截面EC A 1内,过E 作C A EG 1⊥，G 是垂足, 取A C 的中点F,连结BF,FG . 要证: 1EB BE =,只要证: 112B E B B =,只要证:B E F G =且112F G A A =,∵______________________________________________，∴EG ⊥侧面C A 1,由A B=BC ，F 为A C 的中点得BF ⊥A ,∵1ABC A C ⊥平面侧面, BF ⊂平面ABC ，∴BF ⊥侧面1AC ， ∴BF ∥EG ，∴BF 、EG 确定一个平面，交侧面1AC 于FG .∵_____________________________,∴BE ∥FG ，四边形BEGF 是平行四边形，∴BE=FG 又∵1//AA BE ,∴1//AA FG ,∴FGC C AA ∆∆~1,∵F 为A C 的中点,∴112F G A A =得证.②解：分别延长CE 、11B C 交于点D ，连结D A 1 ∵__________________,1112121CC BB EB ==∴111121C B DC DB ==，∵11111111160B A C B C A A B C ∠=∠=∠=︒,∴1190DA C ∠=∴111C A DA ⊥∵______________________________________________________________,∴C A DA 11⊥∴11C CA ∠是所求二面角的平面角.∵_______________________________________, ∴︒=∠4511C CA ,即所求二面角为45°高二数学限时训练(五)答案(2007.4.26)C BC CD B D 8.2()22n f n n +=+ 10.2)1(-n n9.324()43RRππ'=．球的体积函数的导数等于球的表面积函数。

第二阶段五考前基础回归—抓牢分

物质 NaCl CO2 AgI SO2 H 2O2 CaSO4 SiO2 NH3 ①化工原料 ①灭火剂 ①感光材料 ①漂白剂 ②调味品 ②人工降雨
用途 ③腌渍食品 ③温室肥料
NaHCO3 ①治疗胃酸过多
②发酵粉
②人工降雨 ②杀菌消毒 ②火箭燃料 ③调节水泥硬化速度 ②用于有机合成 ③制 ②光导纤维 ②石膏绷带
4．组成特征不含金属元素的离子化合物：铵盐；含有金属元素的阴离子：MnO4 、AlO2 、Cr2O2 ； 7 A2B2型化合物：H2O2、Na2O2、C2H2等；能形成A2B和A2B2型化合物的元素：H、Na、O。 5．其他 (1)易液化的气体：SO2、Cl2、NH3。 (2)易升华的单质：I2。 (3)易潮解的物质：NaOH、MgCl2、CaCl2。
返回
4．常见物质的重要用途物质用途 O3 ①漂白剂 ②消毒剂 ①杀菌消毒 ②制盐酸、漂白剂 ③制氯仿等有机溶 Cl2 剂和多种农药 ①焊接金属的保护气 ②填充灯泡 ③保存粮食作物 N2 ④冷冻剂 ①制导线电缆 ②食品饮料的包装 ③制多种合金 Al ④做机械零件、门窗等 ①制Na2O2等 ②冶炼Ti等金属 ③电光源 ④Na、 Na K合金作原子反应堆导热剂 Al2O3 ①冶炼铝 ②制作耐火材料返回
返回
－
4．变色现象 ①Fe3＋与SCN－、Fe、Cu反应时颜色的变化； ②遇空气迅速由无色变为红棕色的气体必为NO； ③Fe2＋与Cl2、Br2等氧化性物质反应； ④酸碱性溶液与指示剂的变化； ⑤品红溶液与Cl2、SO2等漂白剂的作用； ⑥碘遇淀粉溶液变蓝。返回
5．放(吸)热现象
①强酸和强碱溶于水时一般放热，盐溶于水时一般吸热，NaCl溶于水时热量变化不大； ②氢氧化钡晶体[Ba(OH)2· 2O]与氯化铵晶体混合反 8H 应吸热、二氧化碳与碳的反应也是吸热反应；③酸碱中和、金属与酸、燃烧反应都是放热反应。

高三物理模拟限时训练题(五)

2011—2012学年高三第二学期模拟练兵限时训练物理试题（五）2012.05二、选择题（本题包括7小题，每小题给出的四个选项中，有的只有一个选项正确，有的有多个选项正确，全部选对的得4分，选对但不全的得2分，有选错的得0分）14.了解物理规律的发现过程，学会像科学家那样观察和思考，往往比掌握知识本身更重要。

以下符合事实的是A.英国的物理学家库仑通过油滴实验精确测定了元电荷e的电荷量B.德国天文学家开普勒提出开普勒的三大定律C.英国物理学家法拉第发现了由磁场产生电流的条件和规律——电磁感应定律D.法国物理学家安培发现电流可以使周围的小磁针发生偏转15.静止在光滑水平面上的物体，同时受到在同一直线上的力F1、F2作用，F1、F2随时间变化的图象如图甲所示，则υ-t图象是图乙中的16.2012年2月25日电：25日0时12分，我国在西昌卫星发射中心用“长征三号丙”运载火箭，将第十一颗北斗导航卫星成功送入太空预定转移轨道。

第十一颗北斗导航卫星是一颗倾斜的地球同步轨道卫星。

第十一颗北斗导航卫星进入工作轨道后，下列说法正确的是A.运行速度大于7.9km/sB.运行速度大于静止在赤道上物体的线速度C.卫星运行的角速度比月球绕地球运行的角速度大D.向心加速度与静止在赤道上物体的向心加速度大小相等17.假设某次罚点球直接射门时，球恰好从横梁下边缘踢进，此时的速度为v。

横梁下边缘离地面的高度为h，足球质量为m，运动员对足球做的功为W1，足球运动过程中克服空气阻力做功为W2，选地面为零势能面，下列说法正确的是A.运动员对足球做的功为211W mgh mv2=+B.足球机械能的变化量为W1—W2C.足球克服阻力做功为2211W mgh mv W2=+-D.运动员刚踢完球的瞬间，足球的动能为221mgh mv W2++18.某点电荷和金属圆环间的电场线分布如图所示。

下列说法正确的是A.a点的电势高于b点的电势B.若将一正试探电荷由a点移到b点，电场力做负功C.c点的电场强度与d点的电场强度大小无法判断D.若将一正试探电荷从d点静止释放，电荷将沿着电场线由d到c19.一台理想变压器的原、副线圈的匝数比是11：1，原线圈接入电压为220V的正弦交流电，一个滑动变阻器R接在副线圈上，如图所示。

宜春实验中学高一年级英语限时训练Unit5(五)-教育文档

宜春实验中学高一年级英语必修一Unit 5限时训练（五）Ⅰ.单句填空1.Once upon a time there was a blanket,which had several sheets (contain) a traditional bedtime story.2.I'd appreciate if you could let me know in advance whether or not Mr Jones will be coming.3.The number of the tigers is the decrease just because of the destruction of the environment.4.The parents suggested (sleep)in the hotel room but their kids were anxious to camp out during the trip.5.Everybody tried to reach out to those (affect) by the recent earthquake.6.When Americans are talking,they expect others to respond what they are saying.7.Many students begin to wander from city to city after graduation, (hunt) for a suitable job.8.It is clear that the primary duty of parents is to provide (protect) for their children.9.I'm sorry to say that the table (reserve).What about the table near the window?10.The teacher walked around in the classroom (inspect)the students' work.Ⅱ.阅读理解There are about 5,000 different kinds of ladybugs(瓢虫) in the world. They are also known as lady beetles or ladybird beetles. They come in many different colours and patterns, but the best-known in North America is the seven-spotted ladybug, with its shiny, red-and-black body.In many cultures, ladybugs are thought to be good luck. Most people like them because they are pretty, lovely and do no harm to human beings. But farmers love them because they eat aphids and other plant-eating pests. One ladybug can eat up 5,000 insects in its lifetime!Most ladybugs have dome-shaped bodies with six short legs. Depending on the kind, they can have spots, stripes, or nothing at all. Seven-spotted ladybugs are red or orange with three spots on each side and one in the middle. They have a black head. Ladybugs are colourful for a reason. They tell the enemy:“Eat something else! I taste terrible.”When threatened, they may play dead. Birds are ladybugs' main predators(捕食者), but they are also eaten by frogs, spiders, and dragonflies.第 1 页Ladybugs are happy in many different places,including grasslands,forests, cities, suburbs, and along rivers. Seven-spotted ladybugs are native to Europe but were brought to North America in the mid-1900s.Ladybugs are most active from spring until fall. When the weather turns cold, they look for a warm place to hibernate,such as in rotting logs,under rocks,or even inside houses. These hibernating places can have thousands of ladybugs.The name “ladybug”was given by European farmers who prayed to the Virgin Mary when pests began eating their crops. After ladybugs came and wiped out the invading insects, the farmers named them “beetle of Our Lady”. This later was shortened to “lady beetle”and “ladybug”.1. The underlined word “aphids”in Paragraph 2 is probably a kind of .A.pestB.birdC.plantD.tree2. From the third paragraph we can infer that .A.all ladybugs have spotsB.the colourful body can protect themC.most ladybugs are red or orangeD.frogs are not one of the predators3.The following are all used to describe ladybugs EXCEPT . dybugs can live along riversB.seven-spotted ladybugs were brought to Europe from North Americadybugs are very active in autumnD.the name “ladybug”came from “beetle of Our Lady”4. Which of the following would be the best title for the passage?A.Seven-spotted ladybugsB.The development of ladybugsC.The history of ladybugsdybugsⅢ.完形填空There's an event that changed my life many years ago. It is a memory that 1 comes and goes,but it is one of the most 2 memories that my wife and I 3 .Once we were driving home and decided to 4 at a local gas station to get coffee and something to eat. When we got back into our car, we noticed a man 5 outside in front of the building. You could tell that he was a 6 man. His clothes were 7 . He must have not had enough money to get something to eat. 8 what he did moved all of us.The next thing I remember is a dog that 9 the front of the building.第 2 页I could tell she was a she,because you could tell that she had been 10 puppies(小狗). She was terribly in need of something to eat and I felt so 11 for her. I knew if she didn't eat soon,she and her puppies would not 12 it.My wife and I sat there and looked at her. We 13 that people walked by and didn't even have a look at her. She might not have been as pretty and 14 as most, but she still deserved better. Before my wife and I did anything,15 did. The homeless man, who I thought was hungry himself, went into the store. And what he did brought 16 to me and my wife. He went into the store and,with perhaps all the 17 he may have had, bought a can of dog food and fed that dog.I know that this story isn't as 18 as most stories, but it plays a great part in our lives. That was Mother's Day weekend. And many people 19 that some animals are parents too. And animals are God's 20 like us.1.A.hurriedly B.repeatedlyC.deeplyD.clearly2.A.precious B.enjoyableC.emptyD.painful3.A.forget B.makeC.shareD.guess4.A.arrive B.look C.knock D.stop5.A.standing B.fightingC.sleepingD.eating6.A.hopeless B.carelesselessD.homeless7.A.new B.beautifulC.tornD.colourful8.A.So B.ButC.AndD.Or9.A.attached to B.kept up withC.devoted toD.walked up to10.A.providing B.feedingC.meetingD.leading11.A.sorry B.sillyC.strongD.lucky12.A.stand B.getC.haveD.make第 3 页13.A.hoped B.noticedC.promisedD.pretended14.A.busy B.dirtyC.carefulD.clean15.A.someone B.noneC.anyoneD.nobody16.A.plans B.puzzlesC.tearsD.choices17.A.checks B.foodC.moneyD.flowers18.A.amusing B.inspiringC.embarrassingD.surprising19.A.forget B.rememberC.recallD.think20.A.visitors B.pleasuresC.customersD.creationsⅣ.语法填空阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

2021高考江苏版历史一轮复习：第3单元第5讲课时限时训练5

课时限时训练(五)(限时：45分钟)一、选择题1．(2021·苏北三市三模)?南京条约?英方谈判随从利洛曾记载：“对条文的字眼或措辞一点吹求都没有，为欧洲的外交家们所如此尖细地钻研和慎重地考虑过的条文，只占去(清政府的代表们)一刹那的注意力。

他们的所有心事都集中在一个主要的目标上，就是要我们赶快撤离。

〞这反映出清政府() A．致力维护国家主权B．缺乏近代外交意识C．畏惧英国武力威胁D．鄙视英夷不屑斡旋B[从材料看，在?南京条约?签订时，中国代表全然不顾国家利益，A项错误；中方代表对条约未能仔细研究，据理力争，说明缺乏近代外交意识，B项正确；谈判期间并没有来自英国的直接武力威胁，C项与史实不符；“就是要我们赶快撤离〞说明中方代表害怕害怕，置国家利益于不顾，而非鄙视英夷，D项错误。

]2．(2021·扬州四模)徐中约?中国近代史?：“在英国人看来，这场战争是一场报复性的战争，是一个保卫他们的通商权利、维护其国家荣誉、纠正在华英国官员和臣民所受不公正待遇，以及确保未来开放的必要行动。

在中国人看来，这场战争主要是一场对鸦片的清剿。

〞对材料理解正确的选项是() A．肯定英国人发动战争的正义性B．中国禁烟运动是战争爆发的根本原因C．国家立场影响战争的性质D．都抹杀了鸦片战争发生的实质D[鸦片战争在英国人看来是报复性的战争，在中国人看来是一场对鸦片战争的清剿，双方看问题的立场不同。

“这场战争是一场报复性的战争〞说明英国发动的战争不是正义性的，故A项错误；鸦片战争爆发的根本原因是英国为了翻开中国市场，故B项错误；中英双方对战争的看法表达了中西文明的冲突，材料没有指出鸦片战争的性质，故C项错误；双方的看法都是从各自国家的角度来对待战争，没有点明这场战争的实质是一场英国对中国的侵略战争，双方都抹杀了战争的实质，故D项正确。

]3．1854年，英国向清政府提出中国全境开放通商、外国公使常驻北京、鸦片贸易合法化等18项修约条款。

2021高三限时训练5

2021高三限时训练52021年高三英语限时训练5一．单项填空1. Great opportunities to help others seldom come, but small ones________ us every day. A. offer B. remind C. surround D. trouble 2. The best things you can give children, ________ good habits, are good memories.A. far fromB. next toC. but forD. except for 3. One problem with gazing too frequently into the past is that we may turn around to find the future has ________.A. run outB. faded outC. come outD. broken out4. It is the eyes of other people that ruin us. If all but myself _______ blind, I should want neither afine house nor fine furniture.A. amB. areC. wasD. were5. A habit is something you can do without thinking, ____ is why most of us have so many of them. C. it B. this C. that D. which6. It takes considerable knowledge just to realize the extent of your own ________.A. ignoranceB. knowledgeC. wisdomD. inexperience7. We probably wouldn‘t worry about what people think of us ________ we could know howseldom they do. A. unless B. until C. if D. as8. CICC released a list of the 30 most beautiful counties in China for the year 2014, with Yangshuo ________ the list. A. topped B. topping C. to top D. having topped 9. —Why was the suspect set free? —For lack of ________ evidence. A. solid B. apparent C. ambiguous D. concrete 10. —What you have pointed out doesn‘t relate to what I want to stress today. ________. — OK. I‘ll start over again.A. Get out of hereB. It‘s up to youC. Leave it aloneD. Get to the point 二．完形填空 A new computer program is being praised as alife-changer for blind people. The new program is known as the KNFB Reader app. It can help users listen to the sound of 11 material. Blind people say the KNFB Reader app will make life much 12 . They say it will help with everything 13 reading restaurant menus to studying papers in the classroom. The KNFB Reader makes use of new pattern recognition and image-processing technology, and new hardware for smartphones. People using the app can 14 , or change the position of the camera and read materials out loud. Users say the app has given some people greater 15 . The Reuters news service says these users made the 16 on social media sites such as Twitter. One user, named Gordon Luke, reported that he was able to use the app to read his voting card for the recent referendum in Scotland. Ray Kurzweil told Reuters that the app will be 17 for Android mobile devices in the coming months. He said he may 18 build a version of the app for Google Glass. Google Glass is a small computer screen that can be 19 to eyeglasses. It is able to take photographs, record video and play sound. Ray Kurzweil 20 that ―Google Glass makes sense because you 21 the camera with your head.‖ Mr. Kurzweil started working on what he called ―reading machines‖ in the early 1970s. The idea came after speaking with a blind person who expressed 22 with the lack of technology to assist blind people. 1Mr. Kurzweil‘s first reading machine was the 23 of a washing machine. It cost $50,000. The technology has continued to improve over the past 20 years. The new smartphone app can 24 and take printed material in one language and change it to another language. But it was not available on a mobile device until now. In the past, it cost more than $1,000 to use the software app with a camera and a mobile phone. The 25 of the KNFB Reader app comes at a time when the technology industry is facing 26 . Criticssay the industry is 27 concerned about making software programs for sharing photos and video games. Bryan Bashin leads the non-profit group Lighthouse for the Blind and Visually Impaired in San Francisco. He is also blind. He says the KNFB app shows the positive impact that 28 can have. He says there are times in his life when he wishes the KNFB app were available to him. He adds that the ability to gain information quickly with something that 29 in your pocket at a fast speed will be, what he 30 , ―a game changer.‖ 11. A. printed B. learning C. published D. teaching 12. A. longer B. shorter C. easier D. harder 13. A. from B. for C. on D. off 14. A. set B. adjust C. reach D. adopt 15. A. confidence B. reliance C. independence D. influence 16. A. excuses B. arrangements C. changes D. comments 17. A. probable B. available C. imaginative D. ideal 18. A. otherwise B. also C. never D. once 19. A. compared B. directed C. adapted D. connected 20. A. added B. clarified C. suggested D. confirmed21. A. link B. hold C. direct D. follow 22. A. frustration B. excitementC. satisfactionD. encouragement 23. A. function B. shape C. weight D. size 24. A. overlook B. memorize C. describe D. recognize 25. A. reform B. release C. recovery D. reaction 26. A. breakdown B. praise C. reality D. criticism 27. A. only B. seldom C. too D. not 28. A. nature B. technology C. society D. man 29. A. fits B. drops C. lands D. stays 30. A. admits B. offers C. mentions D. calls 三．阅读理解 You might think thatgood-looking men have every advantage in life. But a new study suggests being handsome may not always work in a man‘s favour – at least when it comes to his career.The research claims that attractive men are less likely to be given a job in a competitive workplace because they intimidate bosses.?It‘s not always an advantage to be pretty,‘ says Marko Pitesa, an assistant professor at the University of Maryland. ?It can backfire if you are perceived as a threat.‘Interestingly, in Pitesa‘s study, it was male attractiveness in particular, rather than female beauty, that made the most difference. If the interviewer expected to work with the candidate as part of a team, then he preferred good-looking men.However, if the interviewer saw the candidate as a potential competitor, the interviewer discriminated in favor of unattractive men.In the first experiment, 241 adults were asked to evaluate fictional job candidates based on fake qualifications and experience, in an online setting.2Men evaluated men and women evaluated women. Interviewers were primed to either think of the candidate as a future co-operator or competitor, and they were given a computer-generated headshot that was either attractive or unattractive.A second experiment involved 92 people in a lab. They were asked to evaluate future competitors or partners in a quiz game, based on credentials that included sample quiz answers, and they saw similar headshots.The patterns of discrimination based on perceived self-interest were the same.Another test opened up to include men interviewing women and women interviewing men.There was still a preference to cooperate with the attractive man and compete against the unattractive man.A final experiment used photographs of actual European business school students, vetted for attractiveness, and found the same pattern.The results suggest that interviewers were not blinded by beauty, and instead calculated which candidate would further their own career.?The dominant theoretical perspective in the social sciences for several decades has been that biases and discrimination are caused by irrational prejudice,‘ Pitesa says.?The way we explain it here, pretty men just seem more competent, so it is actually subjectively rational to discriminate for or against them.‘On a deeper level, she adds, the behavior remains irrational, since there‘s no evidence that a real link exists between looks and competence.31. According to the first three paragraphs, why do attractive men sometimes have difficulty finding a job?A. They are considered as potential threatens.B. They are considered as potential distractions.C. They seem to be hard to cooperate with.D.They seem to be uncompetitive. 32. According to the results of the three experiments, which of the following is true?A. Interviewees‘ attractiveness blinds the interviewers.B. Interviewees ?attractiveness doesn‘t play any role in interviews.C. Interviewees hold advantages when interviewers are picking their team members.D. Interviewers prefer unattractive people when they are expanding their teams. 33. The passage focuses on ________.A. why attractive men are less competitiveB. why attractive women are more likely to land a jobC. how irrational prejudice towards appearance worksD. whether looks are related to competence 四．任务型阅读Cycling is the new golfTraditionally, business associates would get to know each other over a round of golf. But road cycling is fast catching up as the preferred way of networking for the modern professional. A growing number of corporate-sponsored charity bike rides and city cycle clubs are providing an ideal opportunity to talk shop with like-minded colleagues andclients(客户) while discussing different bike frames. Many believe cycling is better than golf for building lasting working relationships, or landing a new job, because it is less competitive.―When you play golf with somebody you have to decide if you‘re going to beat them, or let them beat you,‖ says Peter Murray, a former architect. ―If they‘re a client and you don‘t want to beat them you have to sort of cheat in order to lose. That seems to me not a good way of doing things.‖ Group cycling, and especially long-distance riding, is a shared experience, Mr. Murray says. Riders often work together and help each other out, taking turns to be at the front so that the riders in their slipstream can save almost a third of the effort needed to travel at the same speed.3In 2005, Mr. Murray, who is a keen long-distance rider, founded the annual Cycle to Cannes bike ride. This six-day charity event brings together architects who want to cycle 1,500km from London to the MIPIM property fair in southern France each March. It has raised ￡1.5m for a range of charities in Britain and abroad.How someone rides a bike can give you a real insight into what a person is like, says Jean-Jacques Lorraine, a regular participant of Cycle to Cannes. ―There is an easy rhythm about conversations on a bike. I often find I‘m saying things on a bike which I wouldn‘t normally say, and equally I‘ve been confided in when I wasn‘t expecting it. Some riders are very single-minded, others more collaborative; some are tactical, others an open book.‖Many long-distance bike riders say cycling, especially over long distances, simply makes them feel good; it lifts their mood and concentrates things down to the essentials. ―The pattern of fuelling, riding, fuelling, arriving, celebrating, sleeping and fuelling again putsall the focus on riding and the company of your fellow riders,‖ says Simon Mottram, chief executive of Rapha, a premium cycling-clothes brand. The simple repetitiveness eases the stresses and pressures of normal life, he adds.Why do cycle rides lend riders so well to networking and making professional contacts? ―Grabbing a quick lunch or drink after work, while great for different reasons doesn‘t give you long enough to get to know someone,‖ he says. Mr. Murray believes long rides break down conventional hierarchical(等级制度) barriers. ―A younger rider can be cycling along with a chief executive and help them in some way and you get a reversal of the relationship. This changes the relationship when they are off the ride too.‖Perhaps the most compelling reason why cycling is a good way to network is because, for many professionals, it‘s a passion and a way of life they share. ―Getting out on the bike is what we‘re all dreaming of doing while we‘re sitting at our computers,‖ says Mr Mottram. Key points Details (1) ▲between (2) ▲ ? Both sports help build working relationships. cycling and golf Differences ? In order to please their clients, golf players often lose the game to them (3) ▲ . ? Compared with golf, cycling is less competitive. ? Group cycling involves riders (4) ▲ with each other instead of competing with each other. Other (5) ▲ of ? Such bike rides as Cycle to Cannes help raise money for charities. group cycling ? Group cycling can truly (6) ▲ the personalities of the participants. ? The repetitiveness of cycling can ease riders‘ stresses in daily life, thus (7) ▲ their spirits. Reasons why ? Cycling provides colleagues with (8) ▲ time to get familiar with each cycling is a good other. way to network ? Relationships (9) ▲ during cycling will continue in reality. ? Cycling is the professionals‘ (10) ▲ passion.42021年高三英语限时训练6一．单项填空1. When Qixi is coming, there are ready reminders ________ about, in the form of big ads saying―Sales on Chinese Valentine's Day!‖ in shops, hotels and restaurants.A. dottedB. dottingC. to be dottedD. to be dotting 2. I ________ much of a person who is not wiser today than they were yesterday. A. hadn‘t thought B. wasn‘t thinking C. haven‘t thought D. don't think3. It‘s Mary‘s own fault if she feels ____ at the party—she makes no effort to be friendly to people.A. cut outB. stood outC. made outD. left out 4. —What I cannot put up with is that students may even give me a back talk.—Of course, it‘s not polite of them, but sometimes you should put things ________ and try to understand them.A. upside downB. in placeC. the other way roundD. in order5. A woman uses a hat to block out the sun while walking along a street ________ the temperaturehit a record high. A. that B. whose C. where D. which 6. —Boss, I‘m too tired, so I want to see the whole world. Please accept my resignation. —It seems that I have to accept it. I hope your idea________.A. takes wingB. makes senseC. hangs in thereD. pushes me around 7. With the average temperature for January standing at -50C, ________ is no wonder the village isthe coldest permanently inhabited settlement in the world. A. there B. it C. as D. which 8. —I'm starving. Do we still have any pies left from the dinner yesterday? —Oh, Julia ________ her friends over in the afternoon and they ate them all. A. invited B. has invited C. had invited D. would invite 9. A tiger escaped on Saturday and killed a female keeper________ dead by the zoo's director. A. before shot B. till shot C. before being shot D. till being shot10. — How is everything going? —________ . I got promoted and boughta new car.A. Can‘t complainB. Couldn‘t be betterC. Sick of itD. Give me a break 二．完形填空At noon today I said goodbye to New York forever, thus joining that growing group of people who, for one reason or another, have decided the city is no longer to our liking.A lot of literature has been written on this 11 —the disappointed New Yorker—and I‘ve read much of it, but none of the cases seem to fit 12 my feelings about the city. I don‘t hate New York; there is really nothing there to hate and 13 very little to love. It is a city of indifference, and that‘s the problem. I found I could only 14 indifference in return.A few days ago in Central Park I saw a man leaning on a litter can drinking a carton of orange juice, and when he finished he tossed the container not in the can but on the 15 . I don‘t5。

物理限时训练5

物理限时锻炼5之阳早格格创做
1．品量为m，电量为q的戴正电小物块正在磁感触强度为B，目标笔曲纸里背里的匀强磁场中，沿动摩揩果数为μ的绝缘火仄里以初速度0v启初背左疏通.如图所示，物块经时间t移动距离s后停了下去，设此历程中，q稳定，则（ BC ）
A．
2
2
v
s
g
μ
>
B．
()
mv
t
mg qv B
μ
>
+
C．
2
2
v
s
g
μ
<
D．
()
mv
t
mg qv B
μ
<
+
2．据有闭资料介绍，受控热核散变反应拆置中有极下的温度，果而戴电粒子将不常常意思上的容器可拆，而是由磁场拘束戴电粒子疏通将其束缚正在某个地区内.现按底下的简化条件去问题计划那个问题，如图所示，有一个环
形地区，其截里内半径为1
3 3
R m
=
，中半径为R2=1.0 m，地区内有笔曲纸里背中的匀强磁场，已知磁感触强度
B=1.0 T，被束缚粒子比荷为
7
4.010/
q
C kg
m
=⨯
，不计戴电粒
子正在疏通历程中的相互效率，不计戴电粒子的沉力.（1）若中空地区中的戴电粒子沿环的半径目标射进磁
（2）若中空地区中的戴电粒子以（1
圆环半径目标射进磁场，供戴电粒子从加进磁场启初到第一次回到该面所需要的时间t.。

限时规范特训05答案

限时规范特训51～2解析：第1题，飞船绕地飞行轨道与地球赤道的夹角为42.40°，这个角也是我们一般情况下看成的纬度度数，所以飞船达到最南和最北的纬度是42.40°S、42.40°N，飞船在A点的经度是105°W，90分钟即小时后地球自西向东自转了22.5°，到达127.5°W，因此飞船第二次到达最南位置时，此地的地理坐标大约是(42.4°S，127.5°W)，C正确，A、B、D 错误。

故选C。

第2题，飞船运行时间为6月，地球公转至近日点是1月初，远日点7月初，3是北半球冬至日附近，1为北半球夏至日附近，根据地球公转方向可知4为春分日附近，2为秋分日附近，标出二分二至日具体日期可以得出6月在1位置，A正确，B、C、D错误。

故选A。

答案：3～4.解析：第3题，读图可知，甲昼长18小时，丁昼长6小时，由此可知丁地夜长是18小时与甲昼长相等，所以甲和丁的纬度数相同，但在不同的半球。

选C正确。

第4题，丁昼长6小时，日落时间＝12＋昼长/2＝15，即丁地15：00日落。

选B正确。

答案：5～6.解析：第5题，材料信息表明，数九如果从每年冬至开始，每九天算一“九”，“九尽桃花开”时应为3月14日前后，处于冬至日(太阳直射南回归线)之后，春分日(3月21日前后，太阳直射赤道)之前，因此太阳直射点位于赤道与南回归线之间，向北移动，C正确，A、B、D错误。

第6题，材料信息表明，数九如果从每年冬至开始，则春分日以前结束，因此直射点在南半球，向北移动。

直射点在南半球，位于北半球的我国北方地区应昼短夜长，排除A；直射点向北移动，则位于北半球的我国北方地区应昼长变长，日出时间不断提前，直射点向我国北方地区靠近，正午太阳高度角不断变大，因此B、C错误，D正确。

答案：7～8.解析：第7题，a～b期间，该地昼短夜长，日出时间越来越早，昼长逐渐变长。

第8题，该地一年中日出最早和日出最晚时间约相差2小时20分钟，因此昼夜长短的变化幅度约为4小时40分钟。

高三限时训练五

象山中学2013届物理限时训练（五）班级姓名一、单项选择题（在每小题给出的四个选项中，只有一项是符合题目要求的）14、请你应用已经学过的电磁学知识，判断以下说法中不正确的是( )A 、我国上空水平飞行的客机，机翼上有微弱的电流B 、电动机启动过程，随着转速的加快，其消耗的电功率也随之增加C 、雷雨天，我们不可以在树下躲雨D 、电动机可以作为发电机来提供电源 15．如图所示，重为10N 的小球套在与水平面成37°角的硬杆上，现用一垂直于杆向上、大小为20N的力F 拉小球，使小球处于静止状态（已知sin37°=0．6，cos37°=0．8）。

则( ) A ．小球不一定受摩擦力的作用B ．小球受摩擦力的方向一定沿杆向上，大小为6NC ．杆对小球的弹力方向垂直于杆向下，大小为4.8ND ．杆对小球的弹力方向垂直于杆向上，大小为12N16. 2010年10月1日18时59分57秒，搭载着嫦娥二号卫星的长征三号丙运载火箭在西昌卫星发射中心点火发射，卫星由地面发射后，进入地月转移轨道，经多次变轨最终进入距离月球表面100公里，周期为118分钟的工作轨道，开始对月球进行探究，下列说法正确的是( ) A ．卫星在轨道Ⅲ上的运动速度比月球的第一宇宙速度大B ．卫星在轨道Ⅲ上经过P 点的加速度比在轨道Ⅰ上经过P 点时大C ．卫星在轨道Ⅲ上经过P 点的速度比在轨道Ⅰ上经过P 点时小D ．卫星在轨道Ⅱ上的机械能比在轨道Ⅰ上多17．在轨道上稳定运行的空间站中，有如图所示的装置，半径分别为r和R （R>r ）的甲、乙两个光滑的圆形轨道安置在同一竖直平面上，轨道之间有一条水平轨道CD 相通，宇航员让一小球以一定的速度先滑上甲轨道，通过粗糙的CD 段，又滑上乙轨道，最后离开两圆轨道，那么下列说法正确的是（）A ．小球在CD 间由于摩擦力而做减速运动B ．小球经过甲轨道最高点时比经过乙轨道最高点时速度大C ．如果减少小球的初速度，小球有可能不能到达乙轨道的最高点D ．小球经过甲轨道最高点时对轨道的压力大于经过乙轨道最高点时对轨道的压力二、选择题（本题共3小题，每小题6分，共18分。

2021年河南中考英语考前冲刺——阅读理解限时训练(五)

2021年河南中考英语考前冲刺——阅读理解限时训练（五）1.May is a beautiful month full of sunshine and flowers. It is also the month when we show thanks to our mothers on Mother's Day.In my family, Mother's Day is celebrated differently every year. Two years ago, I made breakfast for my mom and she still remembers all the dishes I cooked. Last year, I bought her a selfie stick, with the money that I made from selling some of my old books. She uses it all the time. I wanted to do something special on this "quarantined" Mother's Day.In April, I started to search for different gift ideas on the Internet. Finally, I decided to make a special box out of the cards. I made cards by hand and cut each card according to their size, and then I taped them into a box shape. It took me a long time to make it properly. I also put a small bag of colorful chocolates in the box. The messages I wrote on the cards were some small favors I could do for my mom, such as washing dishes.On the night before Mother's Day, I asked my mom to go to sleep early so that I could go into her room and put the present next to her bed. When she woke up, she was very excited about my gift and spent a lot of time looking at the box. My mom is my hero and she has given up her career to take care of me. I am glad that there is a special day in May for me to honor my mom and show her my love.（1）How did the writer get the money to buy the selfie stick?A.By selling cards.B.By making boxesC.By selling old books.D.By washing dishes.（2）What does the underlined word "taped" in Paragraph 3 mean in Chinese?A.规划B.保持C.粘贴D.包裹（3）What is the correct order to make the box for the writer's mother?a. Cut some cards according to size.b. Make cards by handsc. Put a bag of chocolates in it.d. Write some small favors on the cards.e. Tape the cards into a box of shape.A.a-b-e-c-dB.b-a-e-c-dC.b-a-c-d-eD.a-b-c-d-e（4）The passage shows that ________.A.mother cares a lot about her daughterB.mother is too serious about everythingC.mother is cold on the surface but kind in her heart to her daughterD.mother loves her daughter more than her career（5）What is the best title for the text?A.Mother's loveB.My love for motherC.A special giftD.My lovely mother2.Without the Moon, life on the Earth would be totally different. Days would be shorter, for example. Without the Moon and its gravitational pull slowing down the rotation of the Earth, our day might only last six lo eight hours instead of 24 hours!And forget about autumn leaves—the seasons wouldn't exist. Without the Moon's pull on it, Earth might create 200-kmph winds and strong storms one day, with relatively calm weather and totally different temperatures the next. Also, it would be almost extremely black every night of the year.Human might not even exist. That's because without the Moon, most creatures would call the ocean home. Less than half a billion years ago, all life on the Earth was living in the sea. Strange and colorful creatures swam freely through the water or moved around the ocean bed. There were no trees—only plants that lived in the sea.So how did the Moon help more creatures move their home to land? The gravitational pull of the Moon creates high and low tides in the ocean. During low tide,water moves back into the ocean, and there are tide pools-shallow pools of salt water on beaches and nearby rocks. Millions of years ago, some life—forms that lived in tide pools went through some changes that helped them survive the difficult situation Finally they left the ocean to live on land. These early land explorers then became amphibians, dinosaurs, birds, insects, snakes and mammals. But without the Moon, low tide wouldn't exist, and these creatures might have stayed underwater forever.（1）How long may our day last without the Moon?A.6-8 hours.B.7-8 hours.C.12 hours.D.24 hours.（2）Where did all life live about half a billion years ago?A.On land.B.In the air.C.In the seas.D.On the moon.（3）What will happen if there's no Moon's gravitational pull?A.There may be a lot of strong storms.B.People can make a man-made Moon.C.There will be more creatures on the Earth.D.The creatures are sure to stay under water forever.（4）What do we know according to the text?A.Many animals died out because of the Moon.B.Humans will live under the sea in many years.C.Our day time will become less and less in the future.D.Low tide exists because of the Moon's gravitational pull.（5）What's the best title for the text?A.More creaturesB.Life without the MoonC.The creatures on the MoonD.Humans will stay under the water3.When you spend three weeks reading a book, and a month later somebody asks you about it and you can't remember anything you read. What's your feeling? It makes you wonder why you wasted time on it.There are some effective（有效的）ways to learn. And when I say "to learn effectively", what I mean is to not just build up knowledge, but to be able to use that knowledge effectively. So I say, most of the courses people spend money on is not learning. Something is not truly learned until it changes you in some way.●Memory is based on（基于）connectionsOne of my favorite online book clubs is Mentor Box. The club will send you books to read and study materials related（联系）to them. The materials can help you put what you've learnt into good use and make you remember things quickly.You can do this on your own. When you read something useful, write down its connections with something in your life—how you can use the idea, how it can help with your problems, etc.●Read in a right wayPeople believe they have to read everything, line by line, one after another. This is not true. When you buy a book, you're not buying the words, you're buying the useful ideas. The point of a book is the information that is important to you. What matters is the key idea. Once you've received that idea, there's no reason to feel obligated to sit there and read the rest.●Ask the right questionsEverything you read should be questioned. You can question the writer's ideas, whether they're explaining information correctly. When reading something you agree with, you can ask yourself, "Is it possible that this could be wrong?" Asking the right questions will decide the depth of your knowledge and understanding, not the ability toremember a lot of facts and numbers.（1）According to the writer, effective learning ________.A.is spending a long time reading a bookB.helps you get a good feeling after readingC.happens when knowledge changes you in some wayD.is the main purpose of the courses people spend money on（2）What does the writer suggest when we want to remember something?A.Joining our favorite online book club.B.Always writing down something useful.C.Studying the reading materials carefully.D.Building connections between books and our life.（3）The last paragraph tells us that the readers should ________.A.have critical spiritB.remember the details wellC.find the information quicklye the knowledge effectively（4）What does the underlined word "obligated" mean?A.worriedB.forcedC.relaxedD.surprised （5）Which of the following would be the best title for the passage?A.How to Become A Better LearnerB.How to Remember Things EffectivelyC.Ways of Building Connections in Your LifeD.The Importance of Asking the Right Questions4.The Opening of The Book NookSaturday, June 8, 10 A.M. to 10 P.M.You will not want to miss this celebration for the opening of a new neighborhood bookstore! It is at 2289 Main Street, The Book Nook is close to schools and many homes and businesses. Come and check out.The Book Nook on Saturday!Festivities（庆祝活动）will include:★Free food and drinks★ Live music by local musicians★ One Book-of-the-Month Club membership（会员）give awayWide ChoiceThe Book Nook has three floors. There are a large number of books. If we do not have the book you are looking for, we can specially order it for you. You will have it in your hands in two days!Book ActivitiesThe Book Nook will hold monthly book signings by different writers, giving you a chance to meet and speak with well-known writers. Do not miss the unforgettable experience of hearing famous writers read their own books aloud! We also have summer reading programs for children of all ages. These programs are a great way to meet other children and share ideas about your favorite books.The Book-of-the-Month ClubAs a member of our Book-of-the-Month Club, you can choose one new book each month. The membership fee is $120. That is a great price for 12 books a year! So please join us on Saturday and learn about all that The Book Nook offers. You can come anytime between 10 A.M. and 10 P.M.—the celebration lasts all day long!（1）At the opening, The Book Nook will ________.A.offer free food and drinksB.help you to become a writerC.invite children to play musicD.give away books about music（2）At the monthly book signings, you can________.A.read books aloud to famous writersB.meet and speak with famous writersC.hear famous writers read your favorite booksD.talk about your favorite books with famous writers（3）The price of the Book-of-the-Month Club membership is ________.A.$12 a yearB.$12 a monthC.$120 a yearD.$120 a month（4）Which of the following is TRUE?A.The Book Nook has five floors.B.The celebration will last a whole week.C.Mary can go to the Book Nook at 11 A.M. on June 8.D.A member of the club can choose two new books each month.5.Peter was the best table tennis player in his school and hardly ever lost a match. He hated losing anything. When he won, he would feel really good. If he lost, he would feel terrible. It seemed to Peter that losing was the worst thing in the world.A new kid, Albert, came to Peter's school. He was good at table tennis, too. Soon there would be a match between Peter and Albert. Peter worked hard to get ready for the match, but Albert didn't seem to think much of it. When the match began, Albert was a real player. There was always a smile on his face, while Peter looked serious all the time. Peter thought it was so important to win the match that he even wanted to cheat, but he lost in the end."You played very well, Peter. I think we can play again sometime," said Albert.But Peter didn't feel happy and couldn't fall asleep that night.One day, Peter saw Albert playing basketball. Though he lost again and again, the happy smile never left his face. Peter found Albert was great at table tennis but bad at basketball. However, he enjoyed both of them.Whether he won or lost the game, Albert enjoyed it. Peter came to realize that enjoying a game was much more important than winning or losing it. He felt happier than ever before.（1）How did Peter feel when he lost a match?A.Afraid.B.Easy.C.Nervous.D.Terrible.（2）What did Peter learn from Albert?A.Cheating on a test was wrong.B.Finding a friend could make us happier.C.Enjoying a game was the most important.D.Winning the game was something to be proud of.（3）Suppose Peter loses the second game with Albert, he will ________.A.be angry with AlbertB.not fall asleep that nightC.give up playing table tennisD.be happy to have a good time6.Dear Mom and Dad,The time has come: I'm graduating, and I thank you both for all your help during these 15 years. I still remember when you used to say, "You can be whatever you want". I'm so glad you are my parents, especially when I hear kids say they don't get on well with theirs. I'm glad that you support me when I decide to do anything. You always try to help, and that's important tome.Dad, I remember when you first took me fishing. I loved going even though I nevercaught anything. I also remember when you would get angry with me. I realize you were only trying to show me the right way. When I would cry, you would always be there to try to cheer me up.That's what I call a good, loving, caring Dad. Sometimes you and Mom don't agree with me, but you are there by my side in anything that I do, and that's why I love you both so much.Mom, I enjoy going out with you and having our happy time every Friday night, and I hope that never changes. I love telling you everything; the best part about you is that you listen. I'm glad we do a lot together. You love to have fun, and Dad does, too. You always give me your advice and I listen.Thank you for bringing me up.Love always,Allison（1）Allison writes the letter to her parents to show ________.A.wishesB.thanksC.worriesD.regrets（2）When might Allison's father get angry with her?A.She didn't catch any fish.B.She failed and wanted to cry.C.She disagreed with her parents.D.She didn't do things in the right way.（3）What can we know from this passage?A.Allison's mother loves telling her everything.B.Allison's parents are always there by her side.C.Allison doesn't get on well with her parents.D.Allison loves her mother more than her father.7.The Huaping Senior High School for Girls in Lijiang, Yunnan is famous not onlybecause lots of students there enter universities, but also because it is the first girls' public high school that doesn't charge students any money in our country—it's free to everyone in it.Nothing would have happened without Zhang Guimei, head teacher of the Huaping Senior High School for Girls. The 64-year-old woman has been fighting against the unfair things girls face in the mountain for a long time.In 2001, Zhang noticed that many girls from poor families had little chance of getting education. Then the idea of starting a free school for girls came into her mind. To raise money, between 2002 and 2007, Zhang spent the summer and winter vacations on the streets asking people to give away money to her school. However, she only collected about 10,000 yuan.Later, a reporter reported her story. At last, she got one million yuan from the government, and the Huaping Senior School for Girls was opened in September, 2008.There were many difficulties at first, but Zhang didn't give up. "I want my students to go to good universities," she said. So far, over 1,600 girls have left school and received higher education at universities. These came at the cost of Zhang's health.When asked why she tried to help girls in the mountain, Zhang said, "Education for women can influence three generations（代）."（1）What does the underlined word "charge" mean in Chinese?A.收费B.赞助C.支付D.拨款（2）Why did Zhang want to start a free girls' school?A.To create more chances for girls.B.To raise money for the poor families.C.To fight against the unfair things for girls.D.To help girls from poor families get education.（3）Zhang succeeded in setting up the school because of the following reasons EXCEPT that ________.A.she was well known in Lijiang in Y unnanB.she faced many difficulties but she didn't give upC.she spent her holidays collecting money on the streetsD.a reporter reported her story and she got the money to start the school（4）What does the text mainly talk about?A.A high school for girls.B.Ways to start a girls' school.C.Ways of collecting money.D.A woman head teacher in the mountain.8.From red apples to yellow bananas, fruit comes in many different colors. Why do different kinds of fruit have so many colors?According to Lu Wei from the Chinese Academy of Sciences, fruit colors come from their different pigments（色素）. Different amounts（数量）of pigments, depending on the fruit's environment, cause the fruit to turn a certain color.To find out how environment influences fruit colors, Chinese scientists studied more than280 different fruit colors, including white, red, blue, purple and black.They found that red fruit usually grow in cooler places. Blue and purple fruit mostly grows in warm places. These fruits often grow a lot in just one area. The scientists also found that the closer the fruit is to the equator（赤道）, the darker its color will be.Animals have also had an influence on fruit colors. Animals eat fruit and drop the seeds （种子）in other places later. This helps the fruit spread and grow in different places. So, in order to interest animals, some fruit develops colors that are easy for animals to see. For example, birds can see red more easily than humans can. So there are more red fruit in areas where birds live.（1）What decides the fruit colors?A.Pigments.B.The amount of sunshine.C.Water.D.Different places.（2）What's the weather probably like in areas where the black fruit grows?A.It's cool.B.It's warm.C.It's hot.D.It's cold.（3）What does Paragraph 5 mainly talk about?A.Fruit in different places.B.Fruit and seeds in other places.C.Ways to interest animals.D.The influence of animals on fruit colors.参考答案1.【答案】CCBDB2.【答案】ACADB3.【答案】CDABA4.【答案】ABCC5.【答案】DCD6.【答案】BDB7.【答案】ADAD8.【答案】ACD。

限时训练5

班级：小组：姓名：限时训练5出题人：张小平审题人：马俊坡时间：2014年3月4日 1．如图表示一交变电流随时间变化的图象，此交变电流的有效值是（）A ．52A ；B ．5A ；C ．3．52A ；D ．3．5A 2．小型交流发电机中，矩形金属线圈在匀强磁场中匀速转动。

产生的感应电动势与时间呈正弦函数关系，如图所示，此线圈与一个R ＝10Ω的电阻构成闭合电路，不计电路的其他电阻，下列说法正确的是A ．交变电流的周期为0.125B ．交变电流的频率为8HzC ．交变电流的有效值为2AD ．交变电流的最大值为4A3、一只矩形线圈匀强磁场中绕垂直于磁场的轴匀速转动穿，过线圈的磁通量随时间变化的图像如图中甲所示，则下列说法中正确的是( ) A.t=0时刻线圈平面与中性面垂直 B.t=0.01s 时刻，Φ的变化率达最大 C.t=0.02s 时刻，交流电动势达到最大D.该线圈相应的交流电动势图像如图乙所示4一理想变压器的原线圈上接有正弦交变电压，其最大值保持不变，副线圈接有可调电阻R 。

设原线圈的电流为I 1，输入功率为P 1，副线圈的电流为I 2，输出功率为P 2。

当R 增大时 A ．I 1减小，P 1增大 B ．I 1减小，P 1减小 D ．I 2增大，P 2减小 D ．I 2增大，P 2增大5．如图，一理想变压器原线圈接入一交流电源，副线圈电路中R 1、R 2、R 3和R 4均为固定电阻，开关S读数分别为U1和U 2；为理想电流表，读数分别为I 1、I 2和I 3。

现断开S ，U 1数值不变，下列推断中正确的是 A ．U 2变小、I 3变小 B ．U 2不变、I 3变大 C ．I 1变小、I 2变小 D ．I 1变大、I 2变大6．下列运动中，在任何相等的时间内物体的动量变化完全相同的是( )． A ．竖直上抛运动(不计空气阻力) B ．平抛运动(不计空气阻力) C ．匀速圆周运动 D ．自由落体运动7、如图1示，两个质量相等的物体，在同一高度沿倾角不同的两个光滑斜面由静止自由滑下到达斜面底端的过程中，相同的物理量是（）A ．重力的冲量B．弹力的冲量C．合力的冲量D．刚到达底端的动量E．刚到达底端时的动量的水平分量F．以上几个量都不同8、A、B两个物体都静止在光滑水平面上，当分别受到大小相等的水平力作用，经过相等时间，则下述说法中正确的是 [ ]A．A、B所受的冲量相同B．A、B的动量变化相同C．A、B的末动量相同 D．A、B的末动量大小相同9、关于冲量、动量与动量变化的下述说法中正确的是 [ ]A．物体的动量等于物体所受的冲量B．物体所受外力的冲量大小等于物体动量的变化大小C．物体所受外力的冲量方向与物体动量的变化方向相同D．物体的动量变化方向与物体的动量方向相同10、一个质量为m的小球以速率v垂直射向墙壁，被墙以等速率反向弹回．若球与墙的作用时间为t，则小球受到墙的作用力大小为[ ]A．mv/t B．2mv/t C．mv/2t D．011、人从高处跳到低处，为了安全，一般都是让脚尖先着地，接着让整个脚底着地，并让人下蹲，这样做是为了[ ]A．减小人受到的冲量 B．减小人的动量变化C．延长与地面的作用时间，从而减小人受到的作用力D．延长与地面的作用时间，使人所受地面给他的弹力小于人所受的重力12、动量相等的甲、乙两车，刹车后沿两条水平路面滑行，若两车质量之比m1/m2=1/2，路面对两车的阻力相同，则两车滑行时间之比为（）A．1：1 B．1：2 C．2：1 D．1：4一、选择题（把答案填到下表中）二、计算题13、如图50－1所示，质量为m的小球以速度v碰到墙壁上，被反弹回来的速度大小为2v/3，若球与墙的作用时间为t，求小球与墙相碰过程中所受的墙壁给它的作用力．14、一质量为1kg的小球从0．8m高处自由下落到一软垫上，若从小球刚接触软垫到小球陷到最低点经历0．2秒，求软垫对小球的平均作用力。

基础知识限时训练(五)

基础知识限时训练（五）一、单项选择题（下列各小题均有四个选项，其中只有一个选项符合题意。

每小题2分） 1. 以下用品中，在通常情况下属于导体的是A ．塑料刻度尺B ．橡胶轮胎C ．绘画橡皮D ．食盐水 2. 下列实例中，属于增大摩擦的是A ．行李箱安装滚动的轮子B ．轮胎上制有花纹C ．车轴加润滑油D ．磁悬浮列车悬浮行驶 3. 下列现象中属于光的直线传播的是A 、墙壁上装面大镜子，有增大空间的感觉B 、清澈的河底，看起来变浅了C 、人在路灯下行走，出现人影相随D 、清晨，太阳还在地平线以下时，就看到它 4. 在下列四种情境中，人对物体做功的是A ．提着水桶在水平地面上匀速前进B ．扛着米袋慢慢爬上楼梯C ．用力推汽车，汽车没动D ．举着杠铃原地不动 5. 一束光线入射到平面镜上发生反射，若反射角为30°，则入射角为 A 、0° B 、30° C 、45° D 、90°。

6. 图1所示的几种物态变化属于升华的是7. 水无常形，变化万千，如图2所示的各种自然现象，在形成过程中需要吸收热量的是初春，河流中忡夏，草叶间深秋，枝头上寒冬，窗玻璃上冰雪消融露珠晶莹挂满白霜冰花剔透 A B C D图2 8. 下列说法最接近实际情况的是A 、普通中学生使用的课桌高度是1.8mB 、初三年级男生的平均体重约为500NC 、一个鸡蛋的质量约为1gD 、学校教室的高度约为10m9. 关于静止在水平地面上的物体，以下叙述中的两个力属于相互作用力的是A ．地球对物体的吸引力与物体受到的重力B ．地面对物体的支持力与物体的重力C ．物体对地面的压力与地面对物体的支持力D ．物体对地面的压力与物体的重力10. 如图3是简化了的电冰箱的电路图。

图中M 是压缩机的电动机，L 是电冰箱内部的照明灯。

当电冰箱接入电路后，打开电冰箱门时，压缩机停止工作，照明灯照明；关闭电冰箱门时，压缩机开始工作，照明灯停止照明。

人教版高一物理物理限时训练5

人教版高一物理物理限时训练5一、单选题1．如图所示是双人跳水比赛的情景，下列说法正确的是（）A．教练为了研究两人的技术动作，可将图片中的两人视为质点B．两人在下落过程中，感觉水面是静止的C．甲运动员感觉乙运动员是静止的D．观众观看两人比赛时，可将两人视为质点2．如图所示，汽车向右沿直线运动，原来的速度是v1，经过一小段时间之后，速度变为v2，Δv表示速度的变化量，由图中所示信息可知（）A．汽车在做加速直线运动B．汽车的加速度方向与v1的方向相同C．汽车的加速度方向与v2的方向相反D．汽车的加速度方向与Δv的方向相反3．一个做自由落体运动的物体，能正确表示其下落速度v随时间t变化的图象的是()A．B．C．D．4．下列说法正确的是()A．走路时，只有地对脚的作用力大于脚蹬地的力时，人才能往前走B．走路时，地对脚的作用力与脚蹬地的力总是大小相等，方向相反的C．物体A静止在物体B上，A的质量是B的质量的10倍，则A对B的作用力大于B对A的作用力D．以卵击石，石头没有损伤而鸡蛋破了，是因为鸡蛋对石头的作用力小于石头对鸡蛋的作用力5．下列关于重心及重力的说法中，正确的是（）A．一个物体放于水中称量时，弹簧测力计的示数小于物体在空气中时弹簧测力计的示数，因此，物体在水中时的重力小于在空气中的重力B．据G=mg可知，两个物体相比较，质量较大的物体的重力一定较大C．物体放于水平面上时，重力方向垂直于水平面向下，当物体静北于斜面上时，其重力垂直于斜面向下D．物体的形状改变后，其重心位置往往改变6．一个实验小组在“探究弹力和弹簧伸长的关系”的实验中，使用两条不同的轻质弹簧a和b，得到弹力与弹簧长度的图象如图所示。

下列表述正确的是（）A．a的原长比b的长B．a的劲度系数比b的大C．a的劲度系数比b的小D．测得的弹力与弹簧的长度成正比二、多选题7．如图是娱乐节目“中国新歌声”设计的“导师战车”，当坐在战车中的导师按下按钮时，战车就由静止开始沿长10 m 的倾斜直轨道向下运动，某时刻开始减速，到达站在轨道末端的学员面前时，恰好静止，整个过程历时4 s，将加速、减速过程视为匀变速直线运动，则（）A．战车多动过程中导师先失重后超重B．战车运动过程中所受外力不变C．战车加速过程中的加速度一定等于减速过程中的加速度D．战车运动过程中的最大速度为5 m/s三、填空题8．重为400N的木箱放在水平地面上，木箱与地面间的最大静摩擦力是120N，动摩擦因数是0.25，如果分别用70N和150N的水平力推木箱，则木箱受到的摩擦力分别为____N和___N。

吉林省长春市十一中2014届高三下学期限时训练(五)地理试题

长春市十一高中2013—2014学年度高三下学期地理学科限时训练（五）（限时40分钟完成）第Ⅰ卷(选择题，44分)本卷共11个小题，每小题4分，共44分。

在每小题给出的四个选项中，只有一项是符合题目要求的。

读“发达地区与欠发达地区的城市人口和城市化水平对比图”，完成1～2题。

1．图中表示欠发达地区城市化水平变化的曲线是 ( )A ．M1B ．M2C ．N1D ．N22．依图可知在20世纪70年代中期，世界城市人口 ( )A ．总数量开始出现下降趋势B ．发达地区所占比重在增加C ．欠发达地区所占比重在减少D ．两个地区所占比重基本持平下图为“我国某城市简图”，读图完成3～4题。

3．铁路穿越该市区的影响因素最可能是()A ．经济因素B ．社会因素C ．行政因素D ．历史因素 4．图中能正确表示a —b 间地租变化情况的曲线是( )A ．①B ．②C ．③D ．④沃克环流是指正常情况下发生在赤道附近太平洋洋面上的一种热力环流。

若某些年体验探究合作展示份赤道太平洋东部(秘鲁附近)海水大范围持续异常变冷，海水表层温度低于气温平均值0.5℃以上，则称为“拉尼娜”现象。

读下面“沃克环流示意图”，回答5～6题。

5．在沃克环流中 ( )A．甲地为高压 B．乙地为低压 C．气流由乙吹向甲 D．甲地气流垂直下沉6．当“拉尼娜”现象出现时，下列地区降水可能增加的是 ( )①秘鲁沿海②我国南方③北美南部④印度尼西亚A．①② B．③④ C．①③ D．②④读“某地地形剖面图以及气温、年降水量随地形分布示意图。

”，回答7～9题。

7．有关图中A、B两坡的叙述，正确的是( )A．A坡为阳坡、迎风坡 B．B坡为阳坡、迎风坡C．A坡为阳坡、背风坡 D．B坡为阳坡、背风坡8．图中反映的地段，根据气温和降水状况判断，在山麓B地区的自然带最可能是( ) A．温带落叶阔叶林带 B．亚寒带针叶林带C．亚热带常绿硬叶林带 D．热带雨林带9.该地形剖面图可能反映的山地区域是（）A．喜马拉雅山地 B．大分水岭山地 C．阿尔卑斯山地 D．安第斯山地读两区域示意图，回答10-11题。