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用如图所示的电路图研究电流表和电源，其中电源电动势约为3V，内阻不计，电流表量程为100mA （1）有阻值分别为5Ω和30Ω的定值电阻R1和R2分别安装在a、b两处，则a处的电阻为 （填“R1...
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高三下学期物理《》真题及答案
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在实验室用伏安法测定电源的电动势和内阻现备有如下实验器材被测电源一节干电池电压表电流表滑动变阻器开关
某同学采用如下图甲所示的电路测定电源电动势和内电阻已知干电池的电动势约为1.5V内阻约2Ω电压表0～
10分现想要测量某电源的电动势E.和内电阻rE约为4.5Vr约为1.5Ω而手头只有以下器材A.电源电
某同学采用如图甲所示的电路测定电源电动势和内电阻已知干电池的电动势约为1.5V内阻约2Ω电压表0～3
现用伏安法较准确的测一个阻值约为30KΩ的电阻可供选用的实验仪器有A.电源电动势3V内阻0.5ΩB.
用如图电路测电源电动势和内电阻电路中定值电阻R0=4Ω依据测得的数据画出U-I图象如图所示①根据图象
利用如下实验仪器测量某电源的电动势E.和内电阻rA.电源电动势E.约为4.5V内电阻r约为1.5ΩB
某同学采用如图甲所示的电路测定电源电动势和内电阻已知干电池的电动势约为1.5V.内阻约2Ω电压表0～
某同学采用如图甲所示的电路测定电源的电动势和内电阻.已知干电池的电动势约为1.5V内阻约为0.5Ω电
某同学设计了一个如图1所示的实验电路用以测定电源电动势和内阻使用的实验器材为待测干电池组电动势约3V
在用伏安法测定电源电动势和内电阻的实验中1根据实验数据画出如右图所示的图线由图线可知该电源的电动势为
某同学采用如图甲所示的电路测定电源电动势和内电阻已知干电池的电动势约为1.5V.内阻约为1Ω电压表0
某实验小组利用如图甲所示电路测定一节电池的电动势和内电阻备有下列器材①待测电池电动势约为1.5V小于
现用伏安法较准确的测一个阻值约为30KΩ的电阻可供选用的实验仪器有A.电源电动势3V内阻0.5ΩB.
图甲是用伏安法测量金属丝电阻率ρ的实验电路图.1用螺旋测微器测得金属丝直径d如图乙所示可读出d＝__
如图所示是测量干电池的电动势和内电阻的实验器材1画出实验电路图2用实线代替导线将实验器材连成实验电路
把量程为3mA的电流表改装成欧姆表其结构如图所示其中电源电动势E.=3V改装后将原来电流表3mA的刻
某同学采用如下图甲所示的电路测定电源电动势和内电阻已知干电池的电动势约为1.5V内阻约2Ω电压表0～
某同学采用如图甲所示的电路测定电源电动势和内电阻已知干电池的电动势约为1.5V内阻约2Ω电压表0～3
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如图所示并联电路中R0不变Rx增大时电路的总电阻R会选填“增大”“减小”或“不变”． 现有如下器材符合实验要求的电源已调零的电流表和电压表各一个开关一个阻值已知且不同的四个定值电阻R1R2R3和R4导线若干．请设计一个实验来验证上述结论．要求 1画出实验的电路图 2写出实验的步骤以及记录数据的表格．
如图所示轻质细绳将物体AB通过两个定滑轮分别连在同一弹簧测力计的两端其中GA＝10NGB＝50NB是边长为20cm的正方体整个装置处于静止状态不计弹簧测力计的重力及滑轮与绳子的摩擦下列说法正确的是
LongagotherelivedinGreecea1learnman.Hewas2well﹣knownforhisknowledgeofalmosteverythingthatlotsofpeoplefromalloverthecountrycametolearnfromhim.Thegreatmantaughthisstudentswhole﹣heartedlyandansweredtheirquestionswithgreat3patient. OnedayastudentaskedhimMydearteacherdidn'tyousayyouyourselfhavemanymorequestionsaboutthingsthanwedo?4Ithinkwestudentshavefarmorethanyou. Withasmileonhisfacetheteacher5drawtwocirclesoneaslargeasabigcaketheothersmaller.ThenhesaidOfcourseIhavelearnedmuchmore.But6iswrongtothinkateacherhasfewerquestionsthanhisstudents.Nowlookatthesetwocircles.Theinsideofthebiggeroneismyknowledgeofthingsandtheinsideofthesmalleroneis7you.Outofthecirclesiswhatisstillunknowntous.SincemineislargerIhave8usethelongerlinetodrawthebiggercircle.That9meanIhavemoreopportunitiestofacewhatisstillunknown.Andthat'swhyImyselfhavemorequestionsthanyoudo.The10muchyoulearnthemorequestionsyouhave.Youwillneverlearnenoughyouknow.
如图所示的电路电源电压不变小灯泡L标有“3V1.5W”的字样定值电阻R1的阻值为4Ω．当开关S2闭合开关S1S3断开时电流表的示数为0.3A．忽略灯丝电阻的变化求 1小灯泡L的电阻 2电源电压 3当开关S1S3闭合开关S2断开时lmin内电流通过整个电路所做的功．
小金在研究性学习活动中通过查阅资料查到了一种由半导体材料做成的热敏电阻R热的阻值随温度变化的曲线如图1并设计了如图2所示的温度自动控制装置．已知电磁继电器的线圈电阻R0为50欧左侧控制电路电源电压为6伏当继电器线圈中的电流大于或等于20毫安时继电器的衔铁被吸下右侧发热电路就断开． 1求此温度自动控制装置能将温度控制在多少摄氏度以下写出具体计算过程 2若将控制电路的电源电压增大则此装置控制的温度值将变填“高”或“低” 3发热电路中电热丝电阻为44欧正常工作电流5安则加热10分钟产生热量为焦．
小金用图1所示电路来测量小灯泡的电功率部分实验器材的规格已标明．1请用笔画线代替导线将图1中滑动变阻器连入电路使之接入电路的阻值最大2实验中小明发现无论怎样调节滑动变阻器两电表指针始终处于图2所示位置则在③④和③⑥及⑤⑦之间有导线出现了选填短路或断路3故障排除后小明从滑动变阻器接入电路阻值最大时开始记录数据得到小灯泡U﹣I图如图3所示．则小灯泡的额定功率是W所用滑动变阻器的规格是下列四个选项中的选填选项前字母A．10Ω2AB．20Ω2AC．25Ω2AD．30Ω2A
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如图所示将系在细线下的小球拿至A点然后释放小球将在AC两点之间往复摆动如果不考虑空气对小球的阻力下列分析中正确的是
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如图电路电源电压恒为3VR1＝10ΩR2是规格为“20ΩlA”的滑动变阻器．闭合开关S后在向左移动滑片P的过程中下列说法正确的是
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Youmayfeelshortofmoneyevenifyouhaveagoodsalary.Thefollowingaresometipson1tosaveyourmoney.Firstsetgoalstosavemoneyandformmoney﹣saving2habitwhilestayingawayfromthosewhowastemoney.Thinktwicebeforeusingmoneyonexpensiveskincareproducts. Secondcutdownyourdailyexpenses.Whengoingtoasupermarketwritedownwhatyouwanttobuytoavoid3buyunnecessarystuff.Girls4alwaysspendmoneyonclothesshouldkeep5eyeopenfordiscounts﹣﹣﹣you'relikelytobuygoodsummerdressinwinterata6reasonprice.Thirdeconomizeyoursociallife.Whenit'syourturntobuyamealinviteyourfriendstoyourhomeandcookthedinner7you.Ifyouseparatefromyourboyfriendyou8supposetodonatethegiftshesenttoyoutosomecharitiesinstead9throwingthemaway.10finalyouneedtofindotherwaystoearnextramoney.
如图所示在竖直平面内用轻质细线悬挂一个小球将小球拉至P点使细线处于张紧状态．由静止开始释放小球到最低点Q处细线恰好断裂若不计一切阻力下列说法正确的是
图甲是一个豆浆机的实物图豆浆机的中间部位是一个电动机电动机通过金属杆带动其下部的刀片旋转从而将原料粉碎打浆刀片外部是一个环状加热管电热丝用来对豆浆加热该豆浆机的部分参数如表所示．制作豆浆的过程是加热和打浆交替进行图乙是该豆浆机做好一次豆浆的P﹣t图象．求 1加热管正常工作时电阻丝的阻值是多少 2在8～11分钟的时间内设豆浆质量为1.5kg比热恒为4×103J/kg•℃加热管产生的热量全被豆浆吸收到第11分钟时豆浆温度恰好为100℃则第8分钟时豆浆温度为多少 3豆浆机在粉碎打浆时电动机的内阻为40Ω则电动机输出的机械功率是多少
老师利用如图所示的电路做演示实验用电动机提升不同质量的重物稳定上升．小明发现当重物的质量变化时电流表的示数也随之变化电动机的电功率也发生变化．小明猜想如果保证电动机的电流不变电动机的电功率将和重物的质量无关．请你利用图中的器材再根据实验需要添加适当的器材设计一个实验判断小明的观点是否正确． 1画出实验电路图． 2简述实验过程中并写出根据数据判断小明观点是否正确的方法．
如图所示电路中甲乙两处分别接入电流表或电压表．当S闭合后为使两灯均能发光则
最近你们班召开了以我的中国梦MyChineseDream为主题的班会活动.请写一篇日记记述班会情况及自己的感受. 内容要点如下1.每位同学都畅谈了自己对中国梦的理解 2.你谈到了自己的梦想 3.如何实现自己的梦想. 注意1.总词数100左右. 2.可适当增加细节以使行文连贯. May8WednesdaySunday
假定你是李华你在网上看到你所在城市的一个英语培训中心拟招收暑期助教请根据以下要点写一封英语申请信.内容包括1.申请原因2.自我优势口语能力组织能力沟通能力3.希望获准. 注意1.词数100左右 2.可以适当增加细节以使行文连贯 3.信的开头和结尾已给出不计入总词数. 参考词汇助教teachingassistant DearSir/Madam I'mgladtoseeyouradvertisementontheInternet. . Yourssincerely LiHua.
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下画一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. OnedayIwascookinginthekitchenwhilethetelephonerang.Iwenttoansweritimmediately.ShewasmyclosefriendLisa.Whenweweretalkingonaphonethefirealarmsounded.Irunbacktothekitchen.Theroomwasfullsmokeandthebeefwasbadburnt.Iquicklyturnedoffthegasopeningallthewindowsandthenwentoutofthehouse.Tomygreatsurprisestwofireengineswereoutsidemyhouse.Iwasratherworried.Itoldaboutthefirementhatitwasmycarelesscookingwhichcausedtheheavysmoke.
HowSuperAreSupermarkets? Buyingeweek'sgroceriesistiring.Youwanttogetitoveranddonewithquicklysoyouheadforthenearestsupermarketyoufindeverythingyouneedunderoneroofandyoufeelgladthatthosedaysofgoinginandoutofdifferentshopsinthehighstreetareover.Supermarketsseemtobeabigplus.Thereisadownsidethough. IntheUK90%ofallthefoodpeopleconsumeisboughtat5differentsupermarketchains.Thismakesthesecompaniesextremelypowerfulwhichletsthemusetheirhugebuyingpowertosqueezesmallsupplierstogetthebestdeal.Milkisagoodexample.Supermarketsliketousethingslikemilkwhichisthetopofalmosteveryone'sshoppinglisttoattractcustomers.Toofferthelowestpricepossibletotheconsumerthesupermarketsforcedairyfarmerstosellmilkatlessthanthecostofproduction.Supermarketsguaranteetheirgoodprofitswhilefarmersareleftstrugglingtomakeendsmeetandthetaxpayerpaystosupportthesystemwithoutevenknowingit. Itwouldbeniceiflocalgrocerssupportedlocalagriculture.Butforthebigsupermarketsthisjustdoesn'tmakesense.Supermarketsdon'twantlittlefarmersthinkingtheycandecideprices.Sosupermarketshavestartedaglobalsearchforthecheapestpossibleagriculturalproduce.Inmanysupermarketsitisdifficulttofindanythingwhichisproducedlocally. UKfarmersusedtogrowalotofapples.Notanymore.In199936%ofappleswereimported.By2015thefigurehadrisento80%andthedomesticproductionofappleshadfallenbytwothirds.TheconsumermightjustbehappytogetareasonablypricedmealmadeupoffoodsfromThailandSpainItalyandZambiabutweshouldalsobearinmindtheInfluenceonlocalproducers. Thenthere'spackaging.Supermarketslikeeverythingtobepackedandwrappedsoitcanbepiledneatlyonshelves.Supermarketsproducenearly10milliontonsofwastepackagingintheUKeveryyearofwhichless5%isrecycled.Somesupermarketsmakesurethatlargerecyclingbinsareobviousintheircarparksshowingthattheyareenvironment﹣friendly.Butthatisjustanimage. Whenanewsupermarketisplannedthereareclaimsaboutthenumberofnewjobsthatwillbecreated.Unfortunatelythenumberofjobslostintheareaislargerthanthenumberofnewpositionsinthesupermarket.Onaverageeachnewsupermarketleadstothelossof276jobs. Howeverthemodernworldisallaboutshoppingandthefreedomtobuywhateveryouwhatsoitwouldbeimpossibletostoppeopleshoppingatsomeparticularkindofshop.Butsomemeasuresdoneedtobetakenwhensmallsuppliersloseprofitslocalproducerssuffersealevelsriseandjobsarelostanywaywecan'tjustcareaboutafreecarparkandspecialoffers. 1Theauthormentionsmilkinparagraph2toexplainhowsupermarkets. A.harmsmallsuppliers‘benefits B.supportlocaldairyfarmer C.cheatthetaxpayers D.providecustomerswiththecheapestproduct 2Accordingtothepassagesupermarketskeeppriceadvantageby. A.competingagainsteachother B.reducingproducttax C.purchasinglocalproducts D.importingforeignproducts 3Whatistheauthor'sattitudetowardssupermarkets? A.Doubtful B.Sympathetic C.Critical D.Cautious
MyRealParentsBiologyistheleastofwhatmakessomeoneamother.﹣﹣﹣﹣﹣OprahWinfreyIdon'tlookliketherestofmyfamily.AsamatteroffactI1outquiteabitwithmyyellowskinandblackeyes.WhenpeopleseeustogetheritisclearthatIam2.IamhappytohavesuchalovingandcaringfamilybutsometimesIwishIknewwhomybirthparentsare.Myfriendsoftenask'Areyou3thatyoudon'tknowyourrealparents?'Iknowthattheyarejustcuriousandconcernedaboutme﹣﹣﹣I'mfine.Forthemostpart﹣﹣﹣﹣4Ifeltlikethere'ssomethingmissingmylifelikeagiant5inmyheart.MymotherlistenswhenItellheraboutmy6andshefeelsthatitisimportantformetobeintouchwithmy7.BecauseofthissheandIgotoChineseHeritageCampeachyear.CHCisatwo﹣daycamp8hundredsofadoptedkidslikemespendtimewitheachother.We9abouthowitfeelstotheadoptedandweparticipateinfunoutdooractivities.It's10becausewecantalkaboutourfeelings.ItmakesmefeellikeIamnot11andthatthereissomeoneouttheregoingthroughthesamefeelings.Whetherwe'retalkinglaughingcryingordancing.CHCisalwaysanexperienceto12.IadoreallofthenewpeopleImeetandIwillkeeptheminmyheart13becauseitalwaysfeelsgoodtoknowtherearepeopleoutjustlikeme.Camphas14thewayIlookatthings.Eachyearseemstoopenupnewsurprisesadventuresandfriendships.CHC15metolearnthatbeingadopteddoesn'tmeanthatI'mstrangeitjustmeansthatIwasn'tbornintothe16Ilivewith.Beingadoptedwon'tmakemyparentslovemeanyless.17toChineseHeritageCampnowwhenpeopleaskme'Areyousadyoudon'tknowyourrealparents?'Icansafelyanswer'MaybeIdon'tknowwhomybirthparentsareand18makesmealittlesad.ButIdoknowthatI19withmyrealparentsinarealhousewitharealfamilyandI20.Mylifejustthewayitis.'1A.work B.give C.watch D.stand2A.followed B.honored C.believed D.adopted3A.sad B.ashamed C.surprised D.curious4A.and B.but C.so D.or5A.disease B.wish C.hole D.plan6A.dreams B.suggestions C.feelings D.complaints7A.school Bhometown Cculture D.relatives8A.where B.when Cwhy D.which9A.think B.talk C.write D.look10A.terrible B.funny C.hard D.great11A.happy B.alone C.silent D.alive12Aremember B.describe C.provide D.learn13A.sometimes B.forever C.soon D.later14A.made Bfound C.changed D.Cleared15A.forced B.hoped C.taught D.asked16A.family B.world C.friends D.kids17A.thanks B.Congratulations C.wishes D.Greetings18A.who B.which C.that D.what19A.compare B.deal C.agree D.live20A.enrich B.love C.regard D.improve
Doeshappinesshaveascent? Whensomeoneishappycanyousmellit? Youcanusuallytellwhensomeoneishappybasedonseeingthemsmilehearingthemlaughorperhapsfromreceivingabighug.Butcanyoualsosmelltheirhappiness?SurprisingnewresearchsuggeststhathappinessdoesindeedhaveascentandthattheexperienceofhappinesscanbetransmittedthroughsmellreportsPhys.org. Forthestudy12youngmenwereshownvideosmeanttobringaboutavarietyofemotionswhileresearchersgatheredsweatsamplesfromthem.Allofthemenwerehealthyandnoneofthemweredrugusersorsmokersandallwereaskedtoabstainfromdrinkingoreatingsmellyfoodsduringthestudyperiod. Thosesweatsampleswerethengivento36equallyhealthyyoungwomentosmellwhileresearchersmonitoredtheirreactions.Onlywomenwereselectedtosmellthesamplesapparentlybecausepreviousresearchhasshownthatwomenhaveabettersenseofsmellthanmenandarealsomoresensitivetoemotionalsignaling﹣thoughit'sunclearwhyonlymenwerechosentoproducethescents. Researchersfoundthatthebehaviorofthewomenaftersmellingthescents﹣particularlytheirfacialexpressions﹣indicatedarelationshipbetweentheemotionalstatesofthemenwhoproducedthesweatandthewomenwhosniffedthem. Humansweatproducedwhenapersonishappybringsaboutastatesimilartohappinessinsomebodywhobreathesthissmellsaidstudyco﹣authorGunSeminaprofessoratKocUniversityinTurkey. Thisisafascinatingfindingbecauseitnotonlymeansthathappinessdoeshaveascentbutthatthescentiscapableoftransmittingtheemotiontoothers.Thestudyalsofoundthatotheremotionssuchasfearseemtocarryascenttoo.Thisensurespreviousresearchsuggestingthatsomenegativeemotionshaveasmellbutitisthefirsttimethishasprovedtobetrueofpositivefeelings. Researchershaveyettoisolate分离exactlywhatthechemicalcompoundforthehappinesssmellisbutyoumightimaginewhatthepotentialapplicationsforsuchafindingcouldbe.Happinessperfumesforinstancecouldbeinvented.Scenttherapies香味疗法couldalsobedevelopedtohelppeoplethroughdepressionoranxiety. Perhapsthemostsurprisingresultofthestudyhoweverisourbroadenedunderstandingofhowemotionsgetcommunicatedandalsohowourownemotionsarepotentiallymanagedthroughoursocialcontextandtheemotionalstatesofthosearoundus. 1Whatisthemainfindingofthenewresearch? A.Pleasantfeelingscanbesmeltout. B.Negativeemotionshaveasmell. C.Menproducemoresweats. D.Womenhaveabettersenseofsmell. 2TheunderlinedpartabstainfrominParagraph3probablymeans. A.continue B.practice C.avoid D.try 3Whatistheapplicationvalueofthenewresearch? A.Perfumescouldhelppeopleunderstandeachother. B.Somesmellscouldbecreatedtoimproveourappearance. C.Perfumescouldbeproducedtocurephysicaldiseases. D.Somesmellscouldbedevelopedtobetterourmood. 4Wecanlearnfromthelastparagraphthat. A.happinesscomesfromascentofsweat B.socialsurroundingscaninfluenceouremotions C.peopleneedmoreemotionalcommunication D.positiveenergycandeepenunderstanding
探究影响电磁铁磁性强弱的因素时按图示电路进行实验．逐渐增大电路中的电流进行多次实验每次都能观察到电磁铁甲吸引大头针的数目比乙多．此现象能够说明
ThreeyearsagoaflashoflightningalmostdestroyedLynDiana‘shouseinAberdeen﹣﹣﹣withhertwochildreninside.Therewasahugerainstormshesaysrecallingtheterrifyingexperience.MybrotherandIwereoutsidemakingeveryefforttostopfloodwaterfromcominginthehouse.SuddenlyIwasthrowntothegroundbyaverylargebang.WhenIpickedmyselfuptheroofandthewholeupperstoreyofthehousehadbeendestroyed.Thedoorwasblockedbybrokenbricksbutweforcedourwayinandfoundthechildrenthankfullyunharmed.LaterIwastoldthattobestruckbylightningisachanceinmillion.Infactit'satonechancein600000.EvensoDr.MarkKeysofAERTechnologyanorganizationthatmonitorstheeffectsoflightningthinksyoushouldbecareful.Headvisesanyonewhoisunluckyenoughtobecaughtinastormtogetdownonthegroundandbendintoaballmakingyourselfassmallaspossible. NancyWilderwasplayinggolfataclubinSurreywhenshewashitbyaflashoflightning.Mrs.Wilder'sheartstoppedbeatingbutshewasbroughtbacktoconsciousnessandafterafewdaysinhospitalwhereshewastreatedforburnstoherheadhandsandfeetshewaspronouncedfitagain.Sincethattimeshehasbeenacompletelyfair﹣weathergolfer.Infactagolfcourseisoneofthemostdangerousplacestobeduringathunderstorm.Thebestplacetobeisinsideacar! HaroldDealaretiredelectricianfromSouthCarolinaUSAwasstruckbylightning26yearsago.Heseemedtobeunhurtbutitlaterturnedoutthatthestrikehaddamagedthepartofthebrainwhichcontrolsthesensationoftemperature.SincethenthefreezingSouthCarolinawintershaven'tbotheredHarold. 1WhatdamagedidtherainstormcausetoMrs.Diana'sfamily? A.Herhousewasfloodedandfelldown. B.Herchildrenwereseriouslyillandhurt. C.Thetopstoreyofherhousewascompletelydestroyed. D.Thedoorinthehousewasbrokenbyaverylargebang. 2WhatdidMrs.Wilderdoaftersurvivingthelightningstrike? A.Sheplayedgolfonlyonfinedays. B.Sheneverplayedgolfagain. C.Sheoftenwenttoseeadoctor. D.Shenevertookanymedicine. 3WhatdoweknowaboutHaroldDealfromthelastparagraph? A.Thelightningstrikedidnotdoanyharmtohim. B.Thelightningstrikeburnthishairandskinterribly. C.HesufferedalotfromthefreezingcoldinSouthCarolina. D.Hewasn'tsensitivetotemperaturesafterthelightningstrike. 4Whatcanweconcludefromthepassage? A.Ithappensquiteoftenthatlightningstrikespeopleduringastorm. B.Duringathunderstormyouaresaferinyourhousethaninyourcar. C.Duringathunderstormitisthesafestforyoutostayunderabigroundball. D.Ifyouarecaughtinastormyou'dgetdownaslowaspossibleontheground.
AnartistinOaklandCaliforniaisusinghisskillstohelpthehomeless.GregKloehnbuildsverysmallsheltersthatmakelifeonthestreetsalittlemorecomfortable.Thestructuresofferthehomelesssomesafetyandprotectionfrombadweather.Eachlittlehousealsohaswheelsonthebottomsoitcangowhereveritsownergoes. GregKloehnhasgivenawayatleast20tinyhouses.Severalareontheroadsidenearanactiverailroad.OnarecentdayMr.KloehnstopsatonetovisitOscarYoung.Thetwomenhug.InsidehislittleshelterMr.Younggetsrelieffromcoldnightsonthestreets.Mr.KloehnalsovisitsSweet﹣Peaanotherfriendwhoalsolivesinoneofthelittlehomestheartistbuilt.Shesaysitkeepshersafeandprotectsherbelongings. InthemorningsMr.Kloehnsearchesthestreetsforbuildingmaterials.Hegatherswhathecanandtakesittohisstudio.Thereheputsthehousestogether.Emptycoffeebagsbecomeroofmaterial.Awashingmachinedoorandrefrigeratorpartbecomewindows.Nailsscrewsandthestickyglueholdallthepiecestogether.Theartistalsoattachesasmallelectricaldevicetothehouse.Thedeviceispoweredbythesun. Someofthepeoplelivingonthestreetsoncehadnormalhousesoftheirown.Butsomeofthepeoplesaytheyhavelearnedtolivewithlessandtheyarethankfultothatman. Mr.Kloehnsayshisworkisnotasocialproject.Hesaysheisjustsomeoneusinghisskillstohelphishomelessneighbors. 1ThefollowingaretheadvantagesofthesmallsheltersEXCEPT. A.savingpowerandenergy B.decoratingthestreetswheretheyare C.protectingpossessionsofthehomeless D.keepingthehomelesssafeandcomfortable 2Wecanlearnfromthepassagethat. A.Anactofkindnesshasmadepeoplesimpleandgrateful B.GregKloehnhassoldatleast20tinyhouses C.Thesheltersareimmovable D.Thegovernmenthasgotinvolvedintheaction 3What'sthemainideaofthepassage? A.Amorecomfortableshelteronthestreets. B.Anartistcreateshomesforthehomeless. C.AsuccessfulsocialprojectinOakland. D.Anartistmakesalivingbydesigningsmallshelters.
如图1所示质量不计的弹簧竖直固定在水平面上t＝0时刻将一金属小球从弹簧正上方某一高度处由静止释放小球接触弹簧并将弹簧压缩至最低点形变在弹性限度内然后又被弹起离开弹簧上升到一定高度后又下落如此反复．通过安装在弹簧下端的压力传感器测出该过程中弹簧弹力F随时间t变化的图象如图2所示不计空气阻力． 1在整个运动过程中小球的机械能填“守恒”或“不守恒” 2小球动能最小的时刻是填t1t2或t3 3在t2～t3这段时间内小球的动能填“先增大后减小”“先减小后增大”“一直增大”“一直减小”
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