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某同学利用如图甲所示的装置验证动能定理．固定并调整斜槽使它的末端O点的切线水平，在水平地面上依次铺放好木板、白纸、复写纸．将小球从不同的标记点由静止释放，记录小球到达斜槽底端时下落的高度H，并根据落...
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高三下学期物理《》真题及答案
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某探究学习小组验证动能定理的实验装置如图①实验时首先要平衡摩擦力取下沙桶把木板不带滑轮的一端垫高轻推
如图甲所示的演示实验中不论演示装置距地面的高度如何观察到的现象是说明某同学设计了如图乙所示的实验将两
如图14甲所示是某同学验证动能定理的实验装置.其步骤如下a.易拉罐内盛上适量细沙用轻绳通过滑轮连接在
为了探究动能定理一位同学设计了如图所示的实验装置他先固定并调整斜槽让末端O.点的切线水平再将一木板竖
某同学利用如图甲所示的装置验证动能定理．固定并调整斜槽使它的末端O点的切线水平在水平地面上依次铺放
为了探究动能定理一位同学设计了如图6所示的实验装置他先固定并调整斜槽让末端O.点的切线水平再将一木板
动能定理和机械能守恒定律是物理学中很重要的两个力学方面物理规律有一名同学设计了如图I.所示的实验装置
某探究学习小组验证动能定理的实验装置如图①实验时首先要平衡摩擦力取下沙桶把木板不带滑轮的一端垫高轻推
晨晨同学利用如图所示的装置探究动能定理ABC为在B点平滑连接的斜槽装置AB倾斜BC水平．该同学操作
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某同学利用如图甲所示的装置验证动能定理．固定并调整斜槽使它的末端O点的切线水平在水平地面上依次铺放
某兴趣小组在做探究动能定理的实验前提出了以下几种猜想①W.∝v②W.∝v2③W.∝他们的实验装置如下
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某同学利用如图甲所示的装置验证动能定理．固定并调整斜槽使它的末端O点的切线水平在水平地面上依次铺放
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某同学利用如图甲所示的装置验证动能定理．固定并调整斜槽使它的末端O点的切线水平在水平地面上依次铺放
某同学利用如图所示的装置验证动能定理将木板竖直放置在斜槽末端的前方某一固定位置在木板上依次固定好白纸
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机动车驾驶的考核过程中科目三又称道路安全驾驶考试是机动车驾驶人考试中道路驾驶技能和安全文明驾驶常识考试科目的简称假设某人每次通过科目三的概率均为且每次考试相互独立则至多考两次就通过科目三的概率为．
在△ABC中若|+|＝|﹣|AB＝2AC＝1EF为BC边的三等分点则•＝
有学生用五氧化二磷作为乙醇脱水制乙烯的催化剂进行相关实验．按如表所示的量和反应条件在三颈瓶中加入一定量P2O5再注入95%的乙醇并加热观察现象． 实验结果如下 根据上述材料完成下列填空． 写出实验室用乙醇制乙烯的化学方程式． 2如图装置中冷凝管的作用是 3实验1使溴的四氯化碳溶液褪色的物质是写结构简式 4根据实验12可以推断 ①以P2O5作为催化剂获得乙烯的反应条件是 ②P2O5与95%乙醇在水浴70℃加热条件下三颈瓶收集瓶中的液体经检验为磷酸三乙酯可以发生的有机反应的类型是反应．
Hundredsofpeoplehaveformedimpressionsofyouthroughthatlittledevice装置onyourdesk.Andthey'veneveractually41you.Everythingtheyknowaboutyou42throughthisdevicesometimesfromhundredsofmilesaway.43heyfeeltheycanknowyou44fromthesoundofyourvoice.That'showpowerfulthe45is.Powerfulyesbutnotalways46.ForyearsIdealtwithmytravelagentonlybyphone.RanimyfacelessagentwhomI'dnevermet47gotmerock﹣bottompricesonairfarescarsandhotels.Buthercoldvoicereally48me.Isometimeswishedto49anotheragent.OnemorningIhadto50animmediateflighthomeforafamilyemergency.IranintoRani'soffice51.Thewomansittingatthedesk52mymadnesssympatheticallyjumpedup.Shegavemea53smilenoddedwhilelisteningpatientlyandthenprintedoutthe54immediately.'Whatawonderfullady!'Ithought.Rushingout55Icalledoutovermyshoulder'Bythewaywhat'syourname?''I'mRani'shesaid.Iturnedaroundandsawa56womanwithabigsmileonherfacewavingtowishmeasafetrip.Iwas57!WhyhadIthoughtshewascold?Raniwaswellso58.SittingbackinthecaronthewaytotheairportIfigureditallout.Rani's59﹣﹣﹣herwarmsmilehernodsher‘I'mhereforyou'60﹣﹣﹣wereallsilentsignalsthatdidn'ttravelthroughwires.41.A.accepted B.noticed C.heard D.met42.A.came B.moved C.ran D.developed43.A.Thus B.Yet C.Then D.Indeed44.A.rather B.also C.just D.already45.A.Telephone B.voice C.connection D.impression46.A.direct B.useful C.easy D.accurate47.A.inperson B.bymyself C.inpublic D.onpurpose48.A.annoyed B.interested C.discouraged D.confused49.A.promote B.train C.find D.know50.A.arrange B.postpone C.confirm D.book51.A.forthefirsttime B.atanytime C.fromtimetotime D.ingoodtime52.A.expecting B.seeing C.testing D.avoiding53.A.shy B.comforting C.familiar D.forced54.A.bill B.form C.ticket D.list55.A.hopefully B.disappointedly C.gratefully D.regretfully56.A.careful B.serious C.nervous D.pleasant57.A.amused B.worried C.helpless D.speechless58.A.calm B.nice C.proud D.clever59.A.forgiveness B.eagerness C.friendliness D.skillfulness60.A.explanation B.attitude C.concept D.Behavior
已知函数fx＝|x+1|+|x﹣2|的最小值为a． 1求实数a的值 2若xyz∈R+且求证x+3y+5z≥3．
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某研究性学习小组设计了一组实验验证元素周期律． 1甲同学在abcd四只烧杯里分别加入50mL冷水再分别滴加几滴酚酞溶液依次加入大小相近的钠Na镁Mg铝Al钾K金属块观察现象． ①甲同学设计实验的目的是验证同一主族从上到下元素的元素金属性逐渐增强同一周期从左到右元素金属性 ②反应最剧烈的烧杯里金属是填字母 A钠B镁C铝D钾 ③写出a烧杯里发生反应的离子方程式． ④实验中发现bc两只烧杯中几乎没有什么现象要想达到实验的目的请你帮助选择下列合适的方法． A．把镁铝的金属块换成金属粉末 B．把烧杯中的冷水换成热水 C．把烧杯中的冷水换成盐酸 D．把烧杯中的冷水换成氢氧化钠溶液 2乙同学设计实验验证非金属元素的非金属性越强其最高价含氧酸的酸性就越强．他设计了如图装置以验证碳氮硅元素的非金属性强弱．乙同学设计的实验可直接证明三种酸的酸性强弱已知A是强酸其浓溶液在常温下可与铜反应B是块状固体烧杯中盛放C的水溶液打开分液漏斗的活塞后C中可观察到白色胶状沉淀生成． ①写出所选用物质的化学式AC． ②写出烧瓶中发生反应的化学方程式． ③碳氮硅三种元素的非金属性由强到弱顺序为．
已知函数fx＝lnxφx＝mx． 1若两函数图象有两个不同的公共点求实数m的取值范围 2若求实数n的最大值．
已知两个数列{an}{bn}的前n项和分别为SnTn其中{an}是等比数列且． 1求{bn}的通项公式 2求{3n•bn}的前n项和．
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AnewcollectionofphotosbringsanunsuccessfulAntarcticvoyagebacktolife.FrankHurley'spictureswouldbeoutstanding﹣﹣﹣﹣undoubtedlyfirst﹣ratephoto﹣journalism﹣﹣﹣iftheyhadbeenmadelastweek.Infacttheywereshotfrom1914through1916mostofthemafteradisastrousshipwreck海难byacameramanwhohadnoreasonableexpectationofsurvival.Manyoftheimageswerestoredinanicechestunderfreezingwaterinthedamagedwoodenship.TheshipwastheEnduranceasmalltightNorwegian﹣builtthree﹣masterthatwasintendedtotakeSirErnestShackletonandasmallcrewofseamenandscientists27meninalltothesouthernmostshoreofAntarctica'sWeddellSea.FromthatpointShackletonwantedtoforceapassagebydogsled雪橇acrossthecontinent.ThejourneywasintendedtoachievemorethanwhatCaptainRobertFalconScotthaddone.CaptainScotthadreachedtheSouthPoleearlyin1912buthaddiedwithhisfourcompanionsonthemarchback.AswriterCarolineAlexandermakesclearinherforcefulandwell﹣researchedstoryTheEnduranceadventuringwaseventhenathoroughlycommercialeffort.Scott'slastjourneycompletedasbelayinatentdyingofcoldandhungercaughttheworld'simaginationandafilmmadeinhishonordrewcrowds.ShackletonaonetimeBritishmerchant﹣navyofficerwhohadgottowithin100milesoftheSouthPolein1908startedabusinessbeforehis1914voyagetomakemoneyfrommovieandstillphotography.FrankHurleyaconfidentandgiftedAustralianphotographerwhoknewtheAntarcticwashiredtomaketheimagesmostofwhichhaveneverbeforebeenpublished.33.WhatdoweknowaboutthephotostakenbyHurley?A.TheyweremadelastweekB.TheyshowedunderseasceneriesC.TheywerefoundbyacameramanD.Theyrecordedadisastrousadventure34.WhoreachedtheSouthPolefirstaccordingtothetext?A.FrankHurleyB.ErnestShackletonC.RobertFalconScottD.CarolineAlexander35.WhatdoesAlexanderthinkwasthepurposeofthe1914voyage?A.ArtisticcreationB.ScientificresearchC.MoneymakingD.Treasurehunting.
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在直三棱柱ABC﹣A1B1C1中底面为等腰直角三角形AB＝BC＝2AA1＝1若EFD别是棱ABCBA1C1的中点则下列四个命题①B1E⊥FD ②三棱锥A﹣BCC1的外接球的表面积为9π ③三棱锥B1﹣DEF的体积为 ④直线C1E与平面ABC所成角为． 其中正确的命题有．把所有正确命题的序号填在答题卡上
若变量xy满足约束条件则x+2y的最大值是
九章算术是我国古代的数学名著体现了古代劳动人民的数学智慧其中第六章“均输”中有一竹节容量问题某教师根据这一问题的思想设计了如图所示的程序框图若输出m的值为67则输入a的值为
FiveyearsagowhenItaughtartataschoolinSeattleIusedTinkertoysasatestatthebeginningofatermtofindoutsomethingaboutmystudents.IputasmallsetofTinkertoysinfrontofeachstudentandsaid'MakesomethingoutoftheTinkertoys.Youhave45minutestoday﹣and45minuteseachdayfortherestoftheweek.'Afewstudentshesitatedtostart.Theywaitedtoseetherestoftheclasswoulddo.Severalotherscheckedtheinstructionsandmadesomethingaccordingtooneofthemodelplansprovided.Anothergroupbuiltsomethingoutoftheirownimaginations.OnceIhadaboywhoworkedexperimentallywithTinkertoysinhisfreetime.Hisconstructionsfilledashelfintheartclassroomandagoodpartofhisbedroomathome.Iwasdelightedatthepresenceofsuchastudent.Herewasanexceptionallycreativemindatwork.HispresencemeantthatIhadanunexpectedteachingassistantinclasswhosecreativitywouldinfect感染otherstudents.Encouragingthiskindofthinkinghasadownside.Irantheriskoflosingthosestudentswhohadadifferentstyleofthinking.Withoutfailonewoulddeclare'ButI'mjustnotcreative.''Doyoudreamatnightwhenyou'reasleep?''Ohsure.''Sotellmeoneofyourmostinterestingdreams.'Thestudentwouldtellsomethingwildlyimaginative.Flyingintheskyorinatimemachineorgrowingthreeheads.'That'sprettycreative.Whodoesthatforyou?''Nobody.Idoit.''Really﹣atnightwhenyou'reasleep?''Sure.''Trydoingitinthedaytimeinclassokay?'25.TheteacherusedTinkertoysinclassinorderto?A.knowmoreaboutthestudentsB.makethelessonsmoreexcitingC.raisethestudents'interestinartD.teachthestudentsabouttoydesign26.WhatdoweknowabouttheboymentionedinParagraph3?A.Helikedtohelphisteacher.B.Hepreferredtostudyalone.C.Hewasactiveinclass.D.Hewasimaginative.27.Whatdoestheunderlinedword'downside'inParagraph4probablymean?A.Mistake.B.Drawback.C.Difficulty.D.Burden.28.Whydidtheteacheraskthestudentstotalkabouttheirdreams?A.Tohelpthemtoseetheircreativity.B.Tofindoutabouttheirsleepinghabits.C.Tohelpthemtoimprovetheirmemory.D.Tofindoutabouttheirwaysofthinking.
已知两点A10Bb0若抛物线y2＝4x上存在点C使△ABC为等边三角形则b的值为
根据金属活动顺序表Cu不能发生如下反应Cu+2H2O＝CuOH2↓+H2↑．但选择恰当电极材料和电解液进行电解这个反应就能变为现实．下列四种电极材料和电解液中能实现该反应最为恰当的是
Readingcanbeasocialactivity.Thinkofthepeoplewhobelongtobookgroups.Theychoosebookstoreadandthenmeettodiscussthem.NowthewebsiteBookCrossing.comBookCrossing.comturnsthepageonthetraditionalideaofabookgroup.Membersgoonthesiteandregisterthebookstheyownandwouldliketoshare.BookCrossingprovidesanidentificationnumbertostickinsidethebook.Thenthepersonleavesitinapublicplacehopingthatthebookwillhaveanadventuretravelingfarandwidewitheachnewreaderwhofindsit.BrucePedersonthemanagingdirectorofBookCrossingsays'Thetwothingsthatchangeyourlifearethepeopleyoumeetandbooksyouread.BookCrossingcombinesboth.'Membersleavebooksonparkbenchesandbusesintrainstationsandcoffeeshops.Whoeverfindstheirbookwillgotothesiteandrecordwheretheyfoundit.Peoplewhofindabookcanalsoleaveajournalentrydescribingwhattheythoughtofit.E﹣mailsarethensenttotheBookCrossingtokeepthemupdatedaboutwheretheirbookshavebeenfound.Brucepetersonsaystheideaisforpeoplenottobeselfishbykeepingabooktogatherdustonashelfathome.BookCrossingispartofatrendamongpeoplewhowanttogetbacktothe'real'andnotthevirtual虚拟.Thesitenowhasmorethanonemillionmembersinmorethanonehundredthirty﹣fivecountries.29.Whydoestheauthormentionbookgroupsinthefirstparagraph?A.Toexplainwhattheyare.B.TointroduceBookCrossing.C.Tostresstheimportanceofreading.D.Toencouragereaderstosharetheirideas.30.Whatdoestheunderlinedword'it'inParagraph2referto?A.Thebook.B.Anadventure.C.Apublicplace.D.Theidentificationnumber.31.WhatwillaBookCrosserdowithabookafterreadingit?A.Meetotherreaderstodiscussit.B.Keepitsafeinhisbookcase.C.Passitontoanotherreader.D.Mailitbacktoitsowner.32.Whatisthebesttitleforthetext?A.OnlineReadingAVirtualTourB.ElectronicBooksAnewTrendC.ABookGroupBringsTraditionBackD.AWebsiteLinksPeoplethroughBooks.
已知NH3和HCl都是能用来做喷泉实验的气体．若在同温同压下用等体积烧瓶一个收集满NH3另一个收集HCl和N2的混合气体如图所示．喷泉实验停止后两个烧瓶内溶液的关系是不考虑烧瓶内溶质的扩散氨水的溶质按NH3计算
Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable.Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished.Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy.Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout.
在一次连环交通事故中只有一个人需要负主要责任但在警察询问时甲说“主要责任在乙”乙说“丙应负主要责任”丙说“甲说的对”丁说“反正我没有责任”四人中只有一个人说的是真话则该事故中需要负主要责任的人是
Agardenthat'sjustrightforyouHaveyouevervisitedagardenthatseemedjustrightforyouwheretheatmosphereofthegardenappearedtototalmorethanthesum总和ofitsparts?36.Butitdoesn'thappenbyaccident.Itstartswithlookinginsideyourselfandunderstandingwhoyouarewithrespecttothenaturalworldandhowyouapproachthegardeningprocess.●37Somepeoplemaythinkthatagardenisnomorethanplantsflowerspatternsandmassesofcolor.Othersareconcernedaboutusinggardeningmethodsthatrequirelesswaterandfewerfertilizers肥料.38.Howeverthereareanumberofotherreasonsthatmightexplainwhyyouwanttogarden.Oneofthemcomesfromourearliestyears.●Recall回忆yourchildhoodmemoriesOurmodelofwhatagardenshouldbeoftengoesbacktochildhood.Grandma'srosegardenandDad'svegetablegardenmightbegoodorbadbutthat'snotwhat'simportant.39﹣﹣howbeinginthosegardensmadeusfeel.Ifyou'dliketobuildapowerfulbondwithyourgardenstartbytakingsometimetorecallthegardensofyouryouth.40thengooutsideandworkoutaplantotranslateyourchildhoodmemoriesintoyourgrown﹣upgarden.Havefun.A.KnowwhyyougardenB.FindagoodplaceforyourowngardenC.It'sourexperienceofthegardenthatmattersD.It'sdelightfultoseesomanybeautifulflowersE.StillothersmaysimplyenjoybeingoutdoorsandclosetoplantsF.YoucanproducethatkindofmagicalqualityinyourowngardentooG.Foreachofthosegardenswriterdownthestrongestmemoryyouhave.
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括 1.主题环境保护 2.展览时间 3.投稿邮箱intlphotoshow@gmschool.com. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
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