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如图所示，电阻R、电容器C与固定在同一水平面上的光滑平行导轨相连，导轨间有竖直向下的匀强磁场．一导体棒垂直放在导轨上且与导轨接触良好，导体棒与导轨电阻不计．现让导体棒获得一初速度v0从位置A向右滑动...
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高三下学期物理《》真题及答案
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在同一水平面中的光滑平行导轨P.Q.相距l=1m导轨左端接有如图所示的电路其中水平放置的平行板电容器
导靴在轿厢对重的上下横梁上固定必须保持横向两导靴在同一水平面上
如图所示电容器固定在一个绝缘座上绝缘座放在光滑水平面上平行板电容器板间距离为d右极板有一小孔通过孔有
两根光滑的长直金属导轨导轨MNM'N'平行置于同一水平面内导轨间距为l电阻不计M.M.'处接有如图所
如图所示是一个由电池电阻R.与平行板电容器组成的串联电路在增大电容器两板间距离的过程中
电阻R.中没有电流
电容器的电容变大
电阻R.中有从b流向a的电流
电阻R.中有从a流向b的电流
电源开关S.定值电阻R.1光敏电阻R.2和电容器连接成如图所示电路电容器的两平行板水平放置当开关S.
液滴向下运动
液滴向上运动
电容器所带电荷量减少
电容器两极板间电压变大
电源开关S.定值电阻R1灯泡L.光敏电阻R2和电容器连接成如图所示的电路电容器的两平行板水平放置当开
灯泡亮度变暗
电容器两极板间电压变小
电容器所带电荷量减小
液滴向上运动
两根光滑的长直金属导轨导轨MNM'N'平行置于同一水平面内导轨间距为l电阻不计M.M.'处接有如图所
10分如图所示为某一电路的俯视图空中存在着竖直向下的匀强磁场磁感应强度为B.在同一水平面上固定着平行
如图所示两根很长的光滑平行导轨相距L放在水平面内其左端接有电容C.阻值为R1和R2的电阻整个装置放在
如图所示是一个由电池电阻R.电键K.与平行板电容器组成的串联的电路电键闭合在增大电容器两极板间距离的
电阻R.中没有电流
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电阻R.中有从a流向b的电流
电阻R.中有从b流向a的电流
如图所示为某一电路的俯视图空中存在着竖直向下的匀强磁场磁感应强度为B.在同一水平面上固定着平行金属轨
如图所示的电路中匀强磁场的磁感应强度为B.在同一水平面上固定着平行金属轨道MN和PQ两轨道间的距离为
如图所示的电路中匀强磁场的磁感应强度为B.在同一水平面上固定着平行金属轨道MN和PQ两轨道间的距离为
如图所示间距为L.的光滑M.N.金属轨道水平放置ab是电阻为R.0的金属棒此棒可紧贴平行导轨滑动.导
两根光滑的长直金属导轨MNM.′N.′平行置于同一水平面内导轨间距为l电阻不计MM.′处接有如图所示
2017年·锦州二模半径分别为r和2r的同心圆导轨固定在同一水平面内一长为r电阻为R的均匀直导棒A
如图所示间距为L.的光滑M.N.金属轨道水平放置ab是电阻为R0的金属棒此棒可紧贴平行导轨滑动.导轨
如图所示空间存在竖直向上的匀强磁场磁感应强度B=0.50T两条光滑的平行金属导轨固定在同一水平面内导
两根光滑的长直金属导轨MNM′N′平行置于同一水平面内导轨间距为l电阻不计M.M′处接有如图所示的电
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在正方体ABCD﹣A1B1C1D1中E为棱CD上一点且CE＝2DEF为棱AA1的中点且平面BEF与DD1交于点G则B1G与平面ABCD所成角的正切值为
设F1F2分别是离心率为的椭圆E＝1a＞b＞0的左右焦点经过点F2且与x轴垂直的直线被椭圆截得的弦长为．1求椭圆E的方程2设直线ly＝x+m与椭圆E交于AB两点线段AB的垂直平分线交x轴点P当m变化时求△PAB面积的最大值．
10分假定英语课.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. 修改在错的词下划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. WelcometotheGreatWall.Measuredmorethan6000kilometersinlengththeGreatWallisknownasthelongwallintheworld.Ithasalonghistoryofmorethan2000years.ThatisamazingabouttheGreatWallisthatitismainmadeofstonesandbricksandalltheconstructionwasdonebyhand.ThoughitwasusedtoprotectthecountryfromforeigninvaderseveryfewhundredmetersalongwiththeGreatWalltherewasawatchtower.NowassymbolofChinatheGreatWallwillbecomeoneofthemostfamoustouristattractionsintheworld.ItisnowonderfulthattheGreatWallattracthundredsofthousandsofforeigntouristseveryyear.
30分Stevewasaseventhgraderabigboylookingmorelikeateenagerthana12﹣year﹣old.Yethewentunnoticed﹣﹣hehadbeen1everyexaminationsincefirstgrade一untilMissWilma. Inthemiddleofthefirstsemesterofschooltheentireseventhgradewas2forbasicskills. YoualldidprettywellMissWilmatoldtheclassaftergoingoverthe3.exceptforoneboy.Andit4myhearttotellyouthisbut..she5thesmartestboyintheseventhgradeisfailingmyclass.Steve6hiseyesandcarefullyexaminedhisfingertips. AfterthatStevestillwouldn'tdohishomework.EvenifMissWilma7punishedhimheremained8 Steveplease!Icareaboutyou! 9Stevegotit!SomeoneCARESABOUTME?! OneMondayacoupleofweekslaterMissWilmagavea10ontheweekendhomework.Steve11throughthetestandwasthefirsttohandinhispaper.Withalookof12MissWilma1ookhispaperandbegantolookitover. MissWilma'sfacewasin13shock!SheglancedupatStevethen14then up.Thesmartestboyintheseventhgradehadjustpassedhisfirsttest! FromthatmomentnothingwasthesameforSteve.Hediscoveredthatnotonlycouldherememberandunderstand15buthecouldtranslatewhathelearnedintohislife.Hebecame16 AfterhighschoolSteveenlistedintheNavyandhehadan17militarycareer.Duringhisnavalyearsheinspiredmanyyoungpeoplewhomightnothave18themselveswithouthim. A19tookplacewithintheheartofaboyallbecauseofoneteacherwho20. 1A.missing B.failing C.passing D.skipping 2A.tested B.classified C.separated D.dismissed 3A.questions B.effects C.lessons D.results 4A.fills B.presses C.breaks D.destroys 5A.shouted B.hesitated C.interrupted D.laughed 6A.dropped Braised C.covered D.closed 7A.strangely B.steadily C.severely D.secretly 8A.helpless B.stubbom C.flexible D.crazy 9A.Commonly B.Unwillingly C.Particularly D.Suddenly 10A.quiz B.chance C.speech D.presentation 11A.slept B.looked C.lived D.hurried 12A.disppointment B.surprise C.satisfaction D.inspiration 13A.btter B.total C.precious D.ridiculous 14A.down B.away C.out D.back 15A.homework B.grades C.knowledge D.subjccts 16A.outstanding B.lazy C.rough D.troublesome 17A.tiring B.ordinary C.hardworking D.successful 18A.reliedon B.lookedafter C.turnedto D.believedin 19A.competition B.choice C.change D.campaign 20A.waited B.listened C.wished D.cared
设集合A＝{x|x+1≤3}B＝{x|4﹣x2≤0}则A∩B＝
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已知双曲线的左右焦点分别为F1F2若双曲线的渐近线上存在点P使得|PF1|＝2|PF2|则双曲线C的离心率的取值范围是．
8分LOSANGELESNov.12Xinhua﹣LegendarycomicbookwriterStanLeehasdiedattheageof95accordingtomediareportsonMonday. LeeborninStanleyLieberonDec.281922beganhiscareerin1939andjoinedtheMarvelComicsin1961. HeisconsideredasoneofthemostlegendarynamesinthehistoryofcomicbooksandtheleadingcreativeforcebehindtheriseofMarvelComics.Heco﹣creatediconicfictionalcharacterssuchasSpider﹣ManX﹣MentheAvengersandmanymore. Lee'scharactersoftenhavesuperpowersbuttheyalsohaveweaknesses.Theywerehumansnotgods.Theynotonlystruggledtosavetheworldbutalsotopaytheirbillsmakefriendsandholdjobs.ThismadeMarvelcomicbookheroesstandapartfromitscompetitorDCwhichproducedtheseeminglyperfectheroeslikeSupermanandWonderWoman.ThosesuperheroeshavebeenadaptedintoblockbusterfilmsmostofwhichweremadeafterDisneyacquiredMarvelina4﹣billion﹣dollardealin2009. InastatementBobIgerchairmanandCEOoftheWaltDisneyCompanysaidStanLeewasasextraordinaryasthecharactershecreated. MarvelalsopraisedLeeonitswebsitebyputtingononeofLee'sfamousquoteswhichgoesIusedtobeembarrassedbecauseIwasjustacomic﹣bookwriterwhileotherpeoplewerebuildingbridgesorgoingontomedicalcareers.AndthenIbegantorealizeentertainmentisoneofthemostimportantthingsinpeople'slives.Withoutittheymightgooffthedeepend.Ifeelthatifyou'reabletoentertainyou'redoingagoodthing. PraisefromhisHollywoodpeersandcolleagueswasgenerous.PresidentofMarvelStudiosKevinFeigeappreciatedLee'sunparalleledimpactontheindustry.NoonehashadmoreofanimpactonmycareerthanStanLeeFeigesaid.OurthoughtsarewithhisfamilyandthemillionsoffanswhohavebeenforevertouchedbyStan'sgeniuscharismaandheart. 1HowdoLee'scharactersdifferfromthoseofDC? A.Theyareperfectheroes. B.Theyoftenhavesuperpowers. C.Theyarenothumansbutgods. D.Theyhavehumanshortcomings. 2WecanlearnfromLee'sstatementinParagraph6that. A.itisembarrassingtobeacomic﹣bookwriter B.atasteofentertainmentisnecessaryinpeople'slives C.entertainmentisthemostimportantthingintheworld D.youcandoeverythingwellifyouareabletoentertain 3Accordingtothepassagewecouldknowthat. A.LeeinfluencedKevinFeige'scareeralot B.LeejoinedtheMarvelComicsinhisforties C.Leecreatedthefictionalcharactersallbyhimself D.ThesuperheroeswereadaptedintofilmsbeforeDisneyacquiredMarvel 4Whatcanbethebesttitleforthepassage? A.ComicsLegend﹣theMarvelsandDC B.TheSuperheroesinStanLee'sComics C.Marvel'sComicsLegendStanLeeDiesat95 D.TheLifeStoryofMarvelComicsLegendStanLee
已知函数fx＝|x+2a|a∈R． 1当a＝1时解不等式fx+|x﹣a|≤5 2若fx+|x﹣1|≤2的解集包含[12]求a的取值范围．
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若x＝1是函数fx＝x3+x2+ax+1的极值点则曲线y＝fx在点0f0处的切线的斜率为
在平面直角坐标系xOy中曲线C1的参数方程为α为参数直线C2的方程为以O为极点以x轴非负半轴为极轴建立极坐标系． 1求曲线C1和直线C2的极坐标方程 2若直线C2与曲线C2交于PQ两点求|OP|•|OQ|的值．
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已知函数fx＝xlnx﹣kx2﹣xab是函数x的两个极值点a＜b． 1求k的取值范围 2证明a•b＞e2．
6分KendickLamarhasn'thadmuchluckwhenitcomesiowningaGramy.Butthat'sOKTheUSrapper说唱歌手hasjustwonaPulitzerPrizeforhismusic. In2014in2016andagainthisyear.Lamarwasnominated提名foranalbumoftheyearGrammy.EachtimehewasbeatenoutfirstbyTaylorSwiftnextbyDaftPunkandmostrecentlybyBrunoMars. ButthePulitzePrizecommitteewasispiredcnoughbyLamar's2017albumDamn.toawardthe30﹣year﹣olditsPulizerPrizeinmusiconApril16.It'sanamazingalbumthatdocumentsthereallifeofmodemAfrican﹣AmericansinSouthLosAngeleswithwildlyaccomplishedbeatsandrhythms. Lamar'swinisconsideredtobehistorical.'ThePulizershavelongdisplayedtheirpreferencetowardhighartratherthanthepopcultureofthemasses.Soit'snotjustthatnorapperhaseverwonaPulitzernopopmusicmakerhaseverwononeintheaward's75﹣yearhistory. ButLamarisnotjustasinger一he'scleveratusinglanguage.Likethebestwritershismusicdescribessmallmomentsthatilustrate阐明largerpoints.HissongsareabouthisexperienceasablackmanwhogrewupinCalifomiastruggledgotintotroubleandfoundhiswayoutbyworkinghardandmakingsenseofthehistoryandrealityofracialproblemsintheUS. He'sanartistwhochallengesideasaidRyanCooglerdirectoreoftheblockbuste大片hitBlackPantherforwhichLamarcreatedmusic.Onebigthemeinourfimisthisideaof'WhatdoesitmeantobeAfrican?'Kendrickinhismusicisveryexactlyanddirectlychallengingthatquestion. Goodartistsentertainusgreataristsmakeusthinkandexceptionalaristshelpusempahize感同身受.Therearealotofgoodgreatevenexceptionalartistsinrockpopcountryandhip﹣hop.ButonlyLamarhasaPulizterPrize. 1WhatisLamarsalbumDamnabout? A.African﹣Americans'historyandculture. B.HardshipsoftheAfrican﹣Americanartists. C.ThewaystheUSgovemmentdealwithracialproblems. D.ThelivesofmodemblackpeopleinSouthLosAngeles. 2WhyisLamar'sPulitzerPrizewinsignificant? A.Heisthefirstfilm﹣makertowintheprize. B.Itisconsideredamilestoneforpopmusic. C.Heisthefirstblackpersontowintheprize. D.HehasmissedGrammyseveraltimesbefore. 3WhatcanwelearnfromRyanCoogler'swords? A.Lamardrewinspirationfromhisownexperience. B.Lamarhasthecouragetotakeonbigcallengesinlife. C.BlackPantheriswellknownbecauseofLamar'smusic. D.Lamar'smusicmathesthethemeofBlackPantherwell.
Your2018ReadingListProvidedbyBillGates Mostofuscan'tlivelikebillionaireMicrosoftco﹣founderBillGatesbutwecanreadlikehim.Gatesrecommendedfourbooksin2018﹣thoughsomewerepublishedearlier. LeonardodaVincibyWalterIsaacson2017 ThebestsellingbiographerofSteveJobsandAlbertEinsteinresearcheddeeplyintodaVinci'scontributionsbeyondarthighlightingthebreadthofhisscientifictechnologicalandcreativeoutput.Leonardonearlyunderstoodalmostallofwhatwasknownontheplanetatthetime.That'smostlybecauseofhiscuriosityabouteveryareaofnaturalscienceandthehumanexperiencesaidGates. TheBestWeCouldDoAnIllustratedMemoirbyThiBui2017 Gatescallsthisgraphicnovelreallyimpressive.BuiisthedaughterofVietnameserefugeeswhocametoAmericaafterthefallofSaigonandbecomingaparentinspiredhertolookintoherownparents'miserablehistory.IwasstruckbyhowtheexperiencesBuiillustratesmanagetobebothuniversalandspecifictotheircircumstancessaidGates. LincolnintheBardobyGeorgeSaunders2018 Saundersalong﹣timeshortstorywriterwonhighpraiseforthisnovel.Thebookimaginestheghoststhathaunt萦绕thebasementofWillieLincolnAbrahamLincoln'ssonwhodiedat11inreallife.Willie'sdeathaftertheCivilWarmadethepresidenthaveanewunderstandingofthegriefhe'screatinginotherfamiliesbysendingtheirsonsofftodieinbattlesaidGates. OriginStoryABigHistoryofEverythingbyDavidChristian2018 ThisnewbookisbythecreatorofBigHistoryafreeonlinesocialstudiescourse.IttraceshistoryinwidesweepingmovementsstartingwiththeBigBanganditprovidesineffectashortcourseinmodernscience.Thisisabriefhistoryoftheuniverse.DavidgetsalittlestuckonthecurrenteconomicandpoliticalproblemsintheWestandIwishhetalkedmoreabouttheroleinnovationwillplayinpreventingtheworsteffectsofclimatechangesaidGates. 1Whichbooksrefertothefieldofscience? A.OriginStoryandLeonardodaVinci B.LincolnintheBardoandOriginStory C.LeonardodaVinciandTheBestWeCouldDo D.TheBestWeCouldDoandLincolnintheBardo 2Ifyouareinterestedinthrillerswhosebookwillyoumostprobablychoose? A.WalterIsaacson B.ThiBui C.GeorgeSaunders D.DavidChristian 3WhichofthefollowingstatementsisTRUE? A.TheBestWeCouldDoisanautobiography. B.LincolnintheBardohasbeenwarmlyreceived. C.DavidChristiantalksmuchaboutthepartthatinnovationwillplay. D.ReaderscanonlyreadaboutLeonardodaVinci'scontributionstowardsart.
10分Ifonethingonyourwish﹣listisastress﹣freeholidaythenherearesomeshoppingtipspreparedforyouwhichwillsavebothyourtimeandmoney. Don'tbetoughonyourbrains.1Don'tbeafraidtolookforcluesandaskforideas.Firstseewhetherthefolksonyourto﹣buy﹣forlisthavealreadydroppedsomevaluablehintsoftheirdreameditems.Ifyoustrikeoutencourageyourluckyrecipientstopostitemstheywishsomeonewouldbuyforthem.Youcanalsofindinspirationinthemanyonlinegiftguides.2﹣GiftsforDadsGiftsforGolfersandsuch.Thenyou'llgettheidea. 3Youreallycanenlistyourownpersonalhelpers.Don'tfeelguiltyaboutthat﹣afterallSantaemployshelperstoo.Manystoreshavefreeprofessionalshopperswhocanpickoutpresentsforyou.We'renottalkingjusthigh﹣endstoressuchasBlooming﹣dale'sandNordstrom.4They'reallhungrytowinyourbusinessawayfromonlineretailers.Butyou'lllikelyneedanappointmentsocallaheadorsearchstores'websitesforpersonalshopping.You'lltypicallyfindalinkonthehomepageunderContactUsorServices. Havegiftsdelivered.Timeismoneyandfornotalotofmoneyyoucansavealotoftimebyhavingyourgiftsdeliveredrighttoyourdoor.Somemom﹣and﹣popshopsofferdeliveryservicewhilechainstorestendtochargeforthatbutitstillmightbeworthpayingfortheconvenience.5Firstgotopostmates.comordownloadthefreeappandseewhetherit'savailableinyourarea.Thentypethenameofastoreintothesearchbarclickonthestoreandentertheitemyouwant. A.Makeanappointmentahead. B.Can'tfigureoutwhattobuy? C.Doyouwishforastress﹣freeholiday? D.Getsomeoneelsetodoshoppingforyou. E.Theyaretypicallyorganizedbyrecipientinterestand/orpricerange. F.OtherslikeMacy'sandJ.Crewwillalsoletyouleavetheshoppingtothem. G.Forlocalstoresthatdon'tofferthisconveniencetrythePost﹣matesdeliveryservice.
已知复数z＝为纯虚数则实数a＝
若函数fx＝m+sinx﹣cosx的最大值为0则m＝
若函数fx＝m+sinx﹣cosx的最大值为0则m＝
设椭圆＝10＞b＞0的右顶点为A上顶点为B．已知椭圆的焦距为2直线AB的斜率为﹣．1求椭圆的标准方程2设直线ly＝kxk＜0与椭圆交于MN两点且点M在第二象限l与AB延长线交于点P若△BNP的面积是△BMN面积的3倍求k的值．
某学生5次考试的成绩单位分分别为8567m8093其中m＞0若该学生在这5次考试中成绩的中位数为80则得分的平均数不可能为
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