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在△ABC中,M是BC的中点,AM=1,点P在AM上且满足=2,则•(+)等于( )
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高三下学期数学《》真题及答案
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如图在直三棱柱ABC﹣A1B.1C.1中AC⊥BCCC1=4M是棱CC1上的一点.1求证BC⊥AM2
1如图1在等边△ABC中点M.是边BC上的任意一点不含端点B.C.联结AM以AM为边作等边△AMN联
如图在△ABC中己知AB=AC=5BC=6且将△ABC≌△DEF将△DEF与△ABC重合在一起△AB
在△ABC中M是BC的中点AM=1点P在AM上且满足=2则·+=________.
在△ABC中M是BC的中点AM=3点P在AM上且满足则=.
如图所示△ABC中点M.是BC的中点点N.在边AC上且AN=2NCAM与BN相交于点P.求APPM
如图四边形ABCD中∠B.=90°AB∥CDM.为BC边上的一点且AM平分∠BADDM平分∠ADC求
图四边形ABCD中∠B=90°AB∥CDM为BC边上的一点且AM平分∠BADDM平分∠ADC.求证1
如图在△ABC中点D.在AB上且CD=CB点E.为BD的中点点F.为AC的中点连结EF交CD于点M.
如图在三棱锥P.-ABC中AB=ACD.为BC的中点PO⊥平面ABC垂足O.落在线段AD上.已知BC
在△ABC中M.是BC的中点AM=1点P.满足=.
2
-2
-
如图所示在△ABC中点M.是BC的中点点N.在边AC上且AN=2NCAM与BN相交于点P.求AP∶P
【提出问题】1如图1在等边△ABC中点M是BC上的任意一点不含端点B.C连结AM以AM为边作等边△A
【提出问题】1如图1在等边△ABC中点M是BC上的任意一点不含端点BC连结AM以AM为边作等边△AM
【提出问题】1如图1在等边△ABC中点M.是BC上的任意一点不含端点B.C.连结AM以AM为边作等边
如图四边形ABCD中∠B.=90°AB∥CDM为BC边上的一点且AM平分∠BADDM平分∠ADC.求
如图在△ABC中M.为边BC的中点沿AM将△ABC折起使点B.在平面ACM外.则当时直线AM⊥平面B
在△ABC中M是BC的中点AM=3点P在AM上且满足则的值为
﹣4
﹣2
2
4
在△ABC中M是边BC上的点N为AM中点则λ+u=.
提出问题1如图1在等边△ABC中点M.是BC上的任意一点不含端点B.C.连结AM以AM为边作等边△A
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MTLEDANONICECENTER*900CEDARBOULEVARD* PITTSBURGHPA15228 412561﹣4363www.mtlebanon.org WHOSkatersofallagesandabilities.Mustbe3yearsofageandpottytrained. AnyPreschoolKindergartenagechildwhohasnevertakenlessonsattheMr.LebanonIceCenterneedstobeevaluated. TheOn﹣lineregistrationfeaturedoesnotapplytoevaluationregistration. Evaluationdatesandtimesarelistedbelow. EVALUATIONSEvaluationshelptodeterminebothreadinessandclassplacement.Uponcompletionoftheevaluationitisrecommendedthatyouregisterforclasseswithanassociatelocatedintheicecenterbooth.AvarietyofdaysandtimesfortheevaluationsarealsolistedonlineandattheIceCenter. Evaluationregistrationmaybedoneinpersonorbyphoneat412﹣561﹣4363. AdditionalevaluationdatesmaybeofferedforsessionⅡ. REFUNDPOLICYRefundrequestsmustbemadeaminimumof7dayspriortoevent.Seewww.mtlebanon.orgfordetails. REGISTRATION Inperson﹣StopbytheMt.LebanonRecreationCentergroundfloorMondaythroughSaturday900a.m.900p.m.orSunday900a.m.530p.m. ByPhone﹣CalltheIceCenterat412561﹣4363toscheduleyourskatingevaluationappointment MakecheckspayabletoMt.LebanonPAvisaMasterCard&DebitCardsaccepted QLESTIONSPleasecalltheMt.LebanonIceCenterstaffat412561﹣4363 LeboALERT﹣AFREEnotificationservicephonetexte﹣mail.Intheeventofanemergencyandtoprovideyouwithupdatesaboutcancellationsandrecreationdepartmentprogramsandevents.Pleasevisitwww.mtlebanonorgandsignupforLeboALERT.AllrecreationparticipantsshouldsignupandatminimumselecttheCancellationscategory. 1What'sthepassagemanlyabout? A.Tointroduceaskatingprogram. B.Toadvertiseaskatingcenter. C.Toserveasaskatingassessmentschedule. D.Toissueafreeskatingnotification. 2Mary'smotherwantstoregisterstheevaluationforherdaughter.Whichtimeasfollowsissuitableforhertogotothecenter? A.Monday830a.m. B.Wednesday2p.m. C.Friday930p.m. D.Sunday600p.m. 3Whichofthefollowingistrueaccordingtothepassage? A.Theevaluationisintendedforallpreschoolandkindergartenchildren. B.Refundrequestscanbeacceptedwithin7daysaftertheregistration. C.ParticipantswhosignupforLeboAlertcanreceivefreenotificationabouttheevent. D.Evaluationregistrationcanbedoneinpersonbyphoneoron﹣line
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ChinesePresidentXiJinpinghaspraisedagroupofmiddleschoolstudentsfortheireffortsinsatellitedesign.Hesaidhewaspleasedwiththeircuriosityandbraveryin1scienceexploration. ThepresidentalsowishedtheteachersandstudentsinBayiSchool2happynewyear. Ximadethepraiseinaletter3writetothestudentsinBeijing'sBayiSchoolonSaturday. Asmallsatellitedesignedanddevelopedbythem4sendintospacelastWednesdayatTaiyuanSatelliteLaunchCenter5itwasdesignedtooperateinorbitfor180days. ThreemonthsagoXireturnedto6hehighschooltovisitalaboratoryandtalktoteachersandstudents7weredesigningthesmallsatellite.Thepresidentsaidhewas8extremegladtoknowthatthesatellitedesignedbythestudentswouldbelaunchedandcalledonthemtobecome9buildofthecountry.Xiwarmlyencouragedthestudents10studyscienceandcontributetothedevelopmentofChina.Hehopedthatthestudentswouldkeephungryforknowledgeanddeveloptheirnationalspirit.
IntheshorttimeSteveandZachhadbeeninsidetheirtentpackingtheirtoolswind-blownflamehadskippedfromthetopofonetreetoanother.Thelongdrysummerhadturnedtheforestintoatinderbox. Let'sgo!Wecanmakeitbacktotheriverwecrossedtoday!StevekeptBradyontheleadandtheirheadsdownagainstthefire-wind.ButBradybarkedasharpwarning.Aheadofthemlayathickcurtainofsmokeacrossthetrack.Theywouldnevermakeitthroughthat.ThedogwaspullingathisleadtryingtodrawthemawayfromthesmokeandyetStevewasuneasy.Itseemedtohimthattheyweremovingawayfromtheriver. SuddenlyZachcried.Zach!Steveshouted.AreyouOK?Whereareyou?ThenBradypulledStevedownasharpslope坡.AtitsbaseZachwasrubbinghisankle. AsStevehelpedhisfriendtohisfeetBradyliftedhisheadandsnuffed嗅thesmoke-ladenwind.Nextmomentthedogboundedawayanddisappeared.Theboysshoutedforhimbuthedidn'tcomeback.Stevecouldn'tblameBradyforpanicking.Hehimselfwantedtoruneventhoughhedidn'thaveacluewhichway. SteveandZachhadn'tgonefarwhentherewasafamiliarbarkandBradycameboundingstoppeddirectlyinfrontofSteveandhithimwithhisheadpushinghimbacktowardtheslopethey'djustclimbed.ButStevedidn'tgetit.ThenBradygrabbedtheboy'sjeansandstartedpulling.ThemessagewasclearbutStevehesitated.OfcourseherememberedBradysavinghisuncle'slifewhenthedogwasmuchyounger.Washestillsharpenoughtogetthemthroughthis? Nearbyapinewentupinawhooshofsmoke.Bradypulledagainurgently.OKbigguyStevegritted咬紧牙关.Bradyledthembackdowntheslopeandintothetrees.Notfarfromthemfirewastouchingunderbrush.Severaltimesthebigdogstopped.Oftenhechangeddirections.StevewassotiredthathejustwantedtorestbutBradywouldn'thaveit.Thedogbulliedbothboystogoon.Howlongthey'dwalkedStevehadnoidea.Hewasalmostnumbwhenheheardit-thewonderfulsoundofrushingwater! 1WhathappenedtoSteveandZachatfirst? A.Theygotinjured. B.Theylosttheirdog. C.Theyweretrapped. D.Theybecameseparated. 2Bradyranawayto. A.seekhelp B.findawayout C.rescueZach D.escapeforlife 3HowdidStevefeelafterBradypulledhisjeans? A.Uneasy. B.Impatient. C.Numb. D.Uncertain. 4Thepassagebasicallydescribes. A.anadventure B.anexploration C.anescapegame D.atrainingprogram
Iwillneverforgetonesummerinmychildhood.Whilewalkingintheattic阁楼Isteppedonsomethingand1downwithmyhandlandingonafloorboardthatpoppedupandalmosthitmeinthehead.WhenI2andlookedinsidetheopenspaceIcouldnotbelievemyeyesTherewasgoldinthere!I3ahandfulofshininggoldcubesrantothebottomstairand4MamaIfoundgolduphereunderthefloor! BackupthestairsIdashed5mybotheralmostknockedmebackdownastheyranrightbyme.WhenMamaopenedthedoorand6herheadinshe7saidHoneythat'sinsulation隔热材料.Nowputitallback. Ifeltreallydisappointed.IhadthoughtImadeareal8. WhenI9insidetoputthefakegoldbackmyhandtouchedwhatfeltlikeabook. Ipulleditout.ItwasoldandsmallBartlett'sFamiliarQuotationswhichI'dneverheardof. And10IwasboredIdecidedtoseewhatwasinsidethislittlebook.Tomy11itwasabookofpassagesphrasesandproverbsandIcouldtellthatthiswasgoingtobe12. SoIspentquitemuchtimeonitandfound13inthesepages.AsIdidn'tknowhowtoexpressthingsclearly.Ioften14totalkaboutthemThisbookhelpedme15thatIdidn'tneedtofeelashamedor16becauseotherpopehadsimilarexperience. WhenIwenttocollegeBartlett'scamewithme.OvertheyearsI'vekeptmyoriginal17whichtothisdayIoften18Althoughitwasa19tofindthebookitliberatedmeinaway.Ithelpedmeseemorethanmyyoungmindandheartwereabletounderstand. Thebookdiscoveredunderthosefloorboardswas20gold. 1A.slowed B.calmed C.looked D.fell 2A.bentover B.showedup C.laydown D.brokein 3A.stole B.produced C.seized D.hid 4A.yelled B.sighted C.admitted D.complained 5A.or B.so C.but D.for 6A.nodded B.stuck C.lowered D.lifted 7A.simply B.thoughtfully C.honestly D.angrily 8A.difference B.choice C.mistake D.discovery 9A.sat B.slid C.reached D.walked 10A.until B.nowthat C.unless D.sothat 11A.surprise B.regret C.relief D.disappointment 12A.absurd B.controversial C.boring D.interesting 13A.sympathy B.comfort C.honor D.doubt 14A.tended B.offered C.managed D.hesitated 15A.expect B.remember C.realize D.imagine 16A.embarrassed B.satisfied C.astonished D.tired 17A.mind B.copy C.plan D.file 18A.putaway B.showoff C.referto D.pickup 19A.dilemma B.disaster C.pity D.coincidence 20A.still B.indeed C.normally D.hopefully
假设你是红星中学学生李华.你的英国笔友Jim在给你的邮件中提到他想了解北京近几年发生了怎样的变化.请给他回复邮件内容包括 1.变化 2.原因 3.感受. 注意1.词数不少于50 2.开头和结尾已给出不计入总词数. DearJim Yours LiHua
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假定英语课上老师要求同桌之间交换修改作文请你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字符号A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. OurschoolsportsmeetingfinallycametoendlastFriday.Tiringbutcheerfulwemadeitasuccess.Icansayit'sthebestoneIhaveeverbeentakenpartin.Theopeningceremonywasafeastfortheeyes.Tobeginwiththeheadmastermakesaspeech.Thencamevariousperformanceincludingsingingdancingandkungfu.Besidesstudentsdressedupasdollsandthattheywantedtoshowwasconfidentandtalent.Whentheteachers'showsbegantheaudiencewentcrazily.AsaclassphotographerItookpicturesofsuchmanybrilliantmomentswhichwithdoubtmeantalottoallofus.
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Somebestmusicandoperaholidaysfor2019. TanglewoodFestival ThevillagesofLenoxandStockbridgeinwesternMassachusettshavebeenthesummerhomeoftheBostonSymphonyOrchestraformorethan80yearsanditsannualTanglewoodfestivalisEastCoastAmerica'smostdistinguishedmusicevent.AndrisNelsonsBSOmusicdirectorconducts14oftheconcertsandstarperformersincludeEmanuelAxPaulLewisandAnne-SophieMutter.TicketsonsaleFeb10. June15-Aug25tanglewood.org AspenFestival Thisyearisthe70thanniversaryoftheAspenMusicFestivaloneofthelongest-runningandmostprestigiousfestivalsintheUnitedStates.The2019programhasyettobeannouncedbutatypicaleight-weeksummerseasonincludesmorethan400classicalmusicevents-includingconcertsbyfiveorchestrassolo独奏andclassicalmusicperformancesfullystagedoperaproductionsmusiclessonslecturesandchildren'sprogramming.TicketsanddetailsavailableinFebruary. June27-Aug18aspenmusicfestival.com GrandTetonMusicFestival Aspen'sgreatclassicalmusiccompetitorintheRockyMountainsistheGrandTetonwhichhasbeenheldinJacksonHolesince1962andatitsheartisatimberconcerthalltheWalkFestivalHallfamousforitsfriendlyatmosphereandexcellentnaturalsound.Despiteitsrelativelymodestsizethehallattractsthegreats-currentmusicdirectoristheScottishconductorDonaldRunnicles.Theprogramfor2019isyettobeannouncedbutsubscriptionsareonsalefromFeb1singleticketsfromMarch1. July2-Aug17gtmf.org SalzburgFestival TheexcitementisbuildinginSalzburgbothforthissummerandforits100thanniversaryyearin2020.BarthePromsitistheworld'soldestmusicfestivalandthisyearitwillpackinanunbelievable199performancesin43daysat16venues.Thisyear'sthemeis‘Myths'andincludesfirstpublicperformancesofMozart'sIdomeneoandGeorgeEnescu'soperadipe. July20-Aug31salzburgfestival.at 1Whichofthefestivalshastheshortesthistory? A.TanglewoodFestival. B.AspenFestival. C.SalzburgFestival. D.GrandTetonMusicFestival. 2WhatcanwelearnaboutTanglewoodFestival? A.ItisheldfromJune27toAug.18. B.ItsticketscanbeavailablefromMarch1. C.ItisbestknownintheeastcoastofAmerica. D.Itsmoreinformationcanbegotfromgtmf.org. 3WhatisthesimilarityofAspenFestivalandSalzburgFestival? A.TheirticketscanbegotinFebruary. B.Theywillbeheldinthesamemonths. C.Theybothhavemusicandoperaperformances. D.Theiraudiencecanbebothadultsandchildren.
如图所示一个水平放置的固定直圆筒左右都与大气相通内部横截面积为S=0.0lm2.中间用两个活塞A和B封住一定质量的理想气体.AB都可以沿圆筒无摩擦地左右滑动但不漏气.A的质量可以不计B的质量为M并与一个劲度系数为5×103N/m的弹簧相连.已知大气压强P0=1×105Pa平衡时两个活塞间的距离L0=0.6m.现在保持温度不变用一水平外力F缓慢推活塞A向右移动一段距离系统最终保持静止此时外力大小为200N求在此过程活中活塞A向右移动的距离.
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假如你是李华你的美国朋友Henry非常喜欢中国来信询问你校中国国学经典Chineseclassics的上课情况.请你依照下列要点写一封回信 1.表达问候; 2.介绍国学上课情况; 3.表达祝愿. 注意1.词数100左右; 2.可以适当增加细节以使行文连贯; 3.标题和落款已给出词数不计算在内. DearHenry Sincerelyyours LiHua
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利用函数图象是一种解决物理问题的常用方法.某同学利用传感器探究一玩具车沿某一路段做直线运动的性质从t=0时刻开始计时得到了一t的图象.如图所示由此可知
Chinahasbecomethefirstcountrytosuccessfullylandaspacecraftonthefarsideofthemoon.TheChang'e-4probe探测器hasalsomadethefirstlunarlandingsince1972.Ithasthetaskofexploringthesideofthemoonthatneverfacestheearth.Thedarksideofthemoonisolderandhasathickersurfacethanthevisibleside.Ittakesthemoonaslongtogoaroundonitsownaxis轴asitdoesforonecompleteorbitaroundtheEarth. TheChineseprobelandedinahugecrater2500kmindiameterand13kmdeep.Thecraterisoneoftheoldestpartsofthemoonandoursolarsystem. Scientistshopetolearnmoreaboutthegeologyofthefarsideofthemoon.Thecrafthastwocamerasonboardwhichwillsendimagesbacktoearth.Itwillalsoattempttosendsignalstodistantregionsofspacesomethingthatcannothappenonearthbecauseoftoomuchradionoise. Chang'e-4alsohasinstrumentsonboardtoexaminemineralsaswellasacontainerwithseedswhichwilltrytocreateaminiature微型的biosphere生物圈. Communicationwiththespacecraftisnoteasy.Imagesandotherdatamustbetransmittedtoaseparatesatellitebecausenodirectcommunicationwiththeearthispossible. ForChinatheChang'e-4missionisanimportantachievementbecausethecountryhassuccessfullydonesomethingnoothernationonearthhas.Itwantstobecomealeadingpowerinspaceexplorationandhasannouncedplanstosendastronautstothemoonandsetupitsownspacestation. 1WheredidtheChang'e4probeland? A.Onthelunarsidefacingtheearth B.Ontheinvisiblesideofthemoon C.Inayoungercrateronthemoon. D.Inapreviousspacestation. 2Whyisthecraftequippedwithacontainer? A.Toseewhatseedscancomeoutonthemoon. B.Tocollectsomeimportantmatteronthemoon. C.Tofindwhethertheseedscangrowonthemoon. D.Tocheckwhethersomemineralsexistonthemoon. 3Whatcanwelearnfromthetext? A.Thedarksideofthemoonisascoldastheotherside. B.Thebrightsideisyoungerandthinnerthantheotherside. C.Otherplacesinspacemayhardlyreceivesignalsfromthecraft. D.Thetwocamerasonthecraftcansendpicturestotheeartheasily. 4AccordingtothetextwhatwillChinadointhefuture? A.Chinawilllandmannedspacecraftonthemoon. B.Chinawillbuiltanotherspacestationonthemoon. C.Chinawilllaunchmorespaceprobestothemoon. D.Chinawillbecomethefirstcountryinexploringspace.
图甲为一列沿x轴传播的简谐横波在某时刻的波形图Q为平衡位置为x1=10cm的质点P为平衡位置为x2=17.5cm的质点.图乙为Q质点从该时刻起的振动图象.①判断波的传播方向②从该时刻起在哪些时刻质点Q会出现在波峰③从该时刻起P点第二次回到平衡位置通过的路程结果保留3位有效数字.
博物馆疏于管理展品积灰门厅冷清急需改善.whose
PeopleYou'veNeverHeardofWhoChangedtheWorld Itisafactthatmostpeoplelivetheirlivesunremarkedbyhistory.Whetherbydesignorbyaccidenttherearesomepioneerswhoseachievementschangedthecourseofhistorybutwhosenamesareunknowntous. JamesHarrison JamesHarrisonhassavedthelivesofovertwomillionpeoplebydonatinghisblood1173timesaGuinnessworldrecord.Hisbloodproducesarareantibody抗体whichcurestheotherwisedeadlyRhesusdiseaseinunbornchildren.Ithasalsobeenusedinthedevelopmentofamedicineanti-DwhichwillcuretheRhesusdiseaseinchildrenforever. LewisLatimer AfterhelpingAlexanderGrahamBellobtainhispatentforthetelephoneLewisLatimerpatentedacarbonfilament碳灯丝whichallowedlightbulbstoburnforhoursbeforeburningoutmuchmoreusefulthanthatinventedbyThomasEdison.Latimerwentontoinventmanyotherusefuldevicesincludingadevicewhichcooledandcleanedpatients'roomsinhospitals. MauriceHilleman Notallachievementsrequirebraveryandself-sacrifice.TakeMauriceHillemanforexample.Hefoundanotherwaytochangetheworld.Hedevelopedthemumpsvaccine疫苗afterhisdaughtergottheillness.Andhedidn'tstopthere.Intotalhehassingle-handedlydevelopedover40vaccinesincludingeightcommonlygiventochildren.Hisworkhassavedmillionsoflivesandpreventedseriousconsequencesduetothediseases. NilsBohlin In1959NilsBohlinpatentedarevolutionarydesignthathassavedmillionsoflives-thethree-pointsafetybelt.Aftertheinitialresistancefromdriverswhohatedbeingtoldwhattodoandevenfortheirowngoodthethree-pointbelthasbecomeastandardfeatureinnewcarsaroundtheworld. 1Whosepatentallowedlightbulbstoburnforhoursbeforeburningout? A.AlexanderGrahamBell. B.LewisLatimer. C.ThomasEdison. D.NilsBohlin. 2What'sthesimilaritybetweenJamesHarrisonandMauriceHilleman? A.Theybothhadspiritsofbraveryandself-sacrifice. B.Theircontributionssavedthelivesofmanychildren. C.Theydevotedthemselvestoworkbecauseoffamilymembers. D.TheybothsetaGuinnessworldrecord. 3Whatwasdrivers'initialattitudetothethree-pointseatbelt? A.Theyrefusedtouseit. B.Theyweresatisfiedwithit. C.Theyweresurprisedatit. D.Theygotexcitedaboutit.
Helicopterparentingdescribesastyleofraisingchildrenwhereparentsareoverprotectiveanddotoomuch.Itdescribesparentswhowatchovertheirkidsathomeandontheplaygroundlikeahelicopter.Todaymoderntechnologyallowsthesehelicopterparentstowatchoverfromevenfaraway.1 JulieLythcottwroteabooktitledBreakFreeoftheOverparentingTrapandPrepareYourKidsforSuccess.Inherbook.shegivesreadersacloserlookatthisparentingstyle.2 JulieLythcottsayssheexperiencedtheeffectsofhelicopterparentingfirsthandwhensheworkedasdeanoffirstyearstudents.3Butmanywereunabletotakecareofthemselves.Heywereturningtoparentsconstantlyforguidanceforproblemsolvingtohavethemmakethechoiceaboutsomething. Sowhatcanparentsdoiftheywanttobreaktheover-parentinghelicoptercycle?4 ◆Stopsayingwewhenyoumeanyoursonoryourdaughter.Alltoooftenaparentwouldsayweareonthetravelsoccerteam.Wellnoyoursonisoryourdaughteris. ◆Stoparguingwithalloftheadultsinourkids?lives.Youneedtoteachyourkidstoadvocateforthemselves. ◆Stopdoingyourkids'homework. ◆5Teachthemtocrossthestreetmakeamealandremembertoputtheirownitemsintheirbackpackswhichbecomesabriefcaseoneday. Whenkidshavealltheskillstotakecareofthemselvestheywillbepreparedforadulthood. A.Fourwaysareofferedtostopwatchingoveryourchildren. B.Shealsoexplainswhyparentsshouldstopit. C.It'sagoodideatoencourageyourkidtodothethingshecanbyhimself. D.Theycangivetheirchildrendirectionsatanymomentfromanywhere. E.Buildyourkids'skills. F.Thefreshmenwereverysmartandaccomplishedonpaper. G.Yourkidiseagerformorefreedombutshouldyougiveittohim?
Areyoutryingtofindwaystobemoreefficientatyourjob?Ifsopleasefollowthesehabitsofnaturallyproductivepeople. Theytakebreaks.1Studiesshowthatprolongedtasksthatrequirehighlevelsoffocusenergyandattentioncancauseyoutobecomelessproductiveandfocusedovertime.Takebriefmentalbreaks.Settingasidealittletimehereandtheretoreleaseyourfocuscansignificantlyhelpmaintainitforlongerperiodsoftime. 2Settledownsupermenandwomen.Whileit'sfinetoprideyourselfonyourabilitiestomultitaskit'sinyourbestinterestandyouremployer'sifyousticktooneto-doatatime.Somewherealongthelinesourculturehasembracedandpromotedthisideathatthemorewecandoatoncethebetter.3Infactthemorewemulti-taskthelessefficientandproductivewebecomeinallthetaskswearetryingtoaccomplish. Theyhaveafullnight'ssleep.Inschoolyoumayhavefoundthattoomanystudentsstayuplatetofinishapaperorstudyforanexambutdespiteyourbesteffortsresearchshowsthisisnotthewaytodobusiness.4Actuallystudieshavelinkedinsufficientsleeptodecreasedlevelsofproductivityunsatisfactoryworkperformanceandpoorersafetyoutcomes. 5Youknowthecountlessbenefitsofexercise.Italsoseriouslyimprovesyourmoodbyreleasingsomethingtorelievestressandincreaseyourbrainsproductivity.Even30-minuteburstsofmoderate-to-highphysicalactivityjustthreetofourtimesadaycangoalongwayinhelpingyouaccomplishyourpersonalandprofessionalgoals. A.Theyvaluefitness. B.PressingpauseIsImportant. C.Theyprefertodomoreeveryday. D.Howeverresearchshowstheopposite. E.Theydon'ttrytodoeverythingatonce. F.Enoughsleepmakesgreatcontributiontoefficientwork. G.Poorsleeporlackofsleepcarriessomeprettynegativerewards.
OKsoit'snotarealwar-buttheU.S.andChinaareatthebeginningofatradewarthankstoPresidentTrump'spolicy.TheChinesegovernmentraised34billiondollarsinnewdutiesongoodsexportedfromtheU.S.lastweekinreplytoPresidentTrump'sunwisetariffs关税of34billiondollarsonChinesegoods. Farmandseafood-producingstatesaregoingtobehithardestbyChina'snewtariffsonU.S.goods.StateswherecarsaremadeandshippedtoChinaareonthehookaswell. Intermsofvaluesome38percentofproductsonthetarifflistarerelatedtoagricultureincludingsoybeanssorghumtobaccoandmeat.That'snothinglikegoodnewsforfarm-beltstatesprimarilyintheMidwestlikeIowa. AwiderangeofseafoodisonChina'starifflist.ThatcouldhurtfisheryworkersinAlaskaandlobsterharvestersinMaine.AlaskaforexampleexportednearlyIbilliondollarsworthofseafoodtoChina.ChinaisamajormarketforAlaskaseafoodsaidAlexaTonkovichExecutiveDirectoroftheAlaskaSeafoodMarketingInstitute.Theseafoodindustrydirectlyemploysnearly60000workersinAlaskaeachyearanddirectlyemploysmoreworkersthananyotherprivateindustry. AndautomakingstatesparticularlyintheSoutharealsoatrisk.Some24percentofproductsonthelist-intermsofvalue-arecarstrucksandothervehicles.Michiganaloneexported$1.7billionworthofmotorvehiclesandvehiclepartstoChinain2017.OtherstatesbeingaffectedincludeSouthCarolinawhereBMWmakesSUVsforboththeU.S.andexportersandAlabamahometoMercedes-BenzToyotaHondaandHyundaifactories. Thisroundoftariffssparessomeindustrieslikecommercialaircraft.WashingtonStatewhichishometoBoeingcouldbreatheasighofrelief.Italsoforthemomentskipstariffsonchemicalproducts. AlexaTonkovichhaswarnedtheU.S.governmentthatthetradewarcouldriskemploymentreduce industryprofitsandcausethehigherpricesforconsumersintheU.S.! 1Whatdoestheunderlinedphraseonthehookmean? A.Delightedintheirluck. B.Lostindeepthought. C.Caughtinadifficultsituation. D.Stuckintrafficjams. 2Whichstatewillbehurttheleastonthisroundoftariffs? A.Washington. B.Iowa. C.Maine. D.Michigan. 3WhatisAlexaTonkovich'sattitudetowardsthetradewar? A.Approving. B.Sympathetic. C.Objective. D.Opposed. 4Whichofthefollowingshowsthedevelopmentofideasinthetext? A.I-P1-Spl-Sp2-P2-Sp-C B.I-PI-Sp-P2-Spl-Sp2-C C.I-P1-P2-Spl-Sp2-Sp3-C D.I-PI-Spl-Sp2-Sp3-P2-C IintroductionPPointSpSub-point次要点CConclusion
假定你是李华你的英国朋友Peter听说现在在中国人工智能已经进入人们的日常生活包括旅游业.他来信询问你十一假期是否有这方面的体验请给他回信内容包括 1.门票无现金手机支付 2.脸部识别人景区 3.邀请他来体验. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.开头和结尾已给出不计入总词数. 参考词汇人工智能artificialintelligence脸部识别facerecognition DearPeter. I'mhappytohearfromyou. Yourstruly LiHua
某物理课外活动小组学习了测量电源的电动势和内阻后自制了一个橙子电池组将该电池组接在铭牌为1.5V0.3A的小灯泡上发现小灯泡不亮用多用电表粗测该电池组电动势约为1.5V流过灯泡的电流约为2mA.为了进一步研究小灯泡不亮的原因该活动小组设计了如图所示的实验电路并用多种方法测量该电池组的电动势与内阻请协助完成实验.1除了开关和导线等基本器材外同学们还准备了以下器材A.电压表0~3VB.电压表0~15VC.电流表0~3.0mAD.电流表0~0.6AE.电阻箱0~99.9ΩF.电阻箱0~9999.9Ω实验中电压表应选用电流表应选用电阻箱应选用.均填选项字母2闭合开关S1和S2调节电阻箱并记录电阻箱的示数R0电流表的示数I0和电压表的示数U0由此可知电流表的电阻RA为用上述量表示.3闭合开关S1和S2调节R仅读出电流I和电压U并测出多组数据作出U﹣I图线可得出电池组的电动势和内阻此种办法测量的电动势与真实值相比填‘偏小相等或偏大测量的内阻值与真实值相比填偏小相等或偏大.4断开S1闭合S2仅由多组电流表的示数和电阻箱的示数R运用实验数据作出﹣R图线为一条倾斜的直线且该直线的斜率为k纵截距为b则该电池组的电动势为内阻为用kbRA表示.5针对34中所述两种方法小组交流讨论后发现所述方法内阻的测量值更精确.填3或4
“嫦娥四号”月球探测器已于2018年12月8日在西昌卫星发射中心由长征三号乙运载火箭发射成功.“嫦娥四号”将经历地月转移近月制动环月飞行最终实现人类首次月球背面软着陆和巡视勘察.已知地球质量为M1半径为R1表面的重力加速度为g月球质量为M2半径为R2.两者均可视为质量分布均匀的球体.则下列说法正确的是
Classifyingthingsiscriticalforourdailylives.Forexamplewehavetodetectspammail垃圾邮件falsepoliticalnews.WhenweuseAIsuchtasksarebasedonclassificationtechnologyinmachineearning-havingthecomputerlearnusingtheboundaryseparatingpositiveandnegativedata.Forexamplepositivedatawouldbephotosincludingahappyfaceandnegativedataphotosthatincludeasadface.Onceaclassificationboundaryislearnedthecomputercandeterminewhetheracertaindataispositiveornegative. Howeverthedifficultywithhistechnologyisthatitrequiresbothpositiveandnegativedataforthelearningprocessandnegativedataarenotavailableinmanycases.Forinstancewhenaretailer零售商istryingtopredictwhowillmakeapurchasetheycaneasilyfinddataoncustomerswhohavepurchasedfromthempositivedatabutitisbasicallyimpossibletoobtaindataoncustomerswhohaveneverpurchasedfromthemnegativedatasincetheydonothaveaccesstotheircompetitors'data. AccordingtolendauthorTakashiIshidafromRIKENAIPPreviousclassificationmethodscouldnotcopewiththesituationwherenegativedatawerenotavailablebutwehavemadeitpossibleforcomputerstolearnwithonlypositivedataaslongaswehaveaconfidencescoreforourpositivedataconstructedfrominformationsuchasbuyingintentionortheactiverateofappusers.Usingournewmethodwecanletcomputerslearnaclassifieronlyfrompositivedataequippedwithconfidence. AccordingtoIshida.Thisdiscoverycouldexpandtherangeofapplicationswhereclassificationtechnologycanbeused.Eveninfieldswheremachinelearninghasbeenactivelyusedourclassificationtechnologycouldbeusedinnewsituationswhereonlypositivedatacanbegatheredduetodataregulationorbusinessconstraints限制.Inthenearfuturewehopetoputourtechnologytouseinvariousresearchfieldssuchasnaturallanguageprocessingcomputervisionroboticsandbioinformatics. 1Howcanthecomputerdistinguishthepositivedatafromthenegativedata? A.Bylearningtheclassificationboundary. B.Byupdatingthedatacollectedregularly. C.Byseparatinghappyfacesandsadones. D.Byintroducingclassificationtechnology. 2WhyistheexamplementionedinParagraph2? A.Toprovehowimportantthepositivedataare B.Toconfirmthatdataoncustomersarecomplete C.Toarguethatretailersgettheircompetitors'data D.Toexplainwhynegativedataarehardtoacquire. 3WhatdotheunderlinedwordsnewmethodinParagraph3referto? A.Analyzingbuyingintention B.Buildingaconfidencescore C.Assessingtheactiverateofappusers D.Equippingthecomputerwithconfidence. 4Whatcanbeasuitabletitleforthetext? A.TheHistoryofClassificationTechnology B.SmarterAlMachineLearningwithoutNegativeData C.BiggerDataComputersAssistingLanguageProcessing D.TheComparisonbetweenPositiveDataandNegativeData
DuringmysecondyearinhighschoolIgotsickandmissedafewdays.WhenI1Iwasgreetedwithtwoessaysduethreedaysofmathandhistoryhomeworkplusseveraltests.2IwenthomefromschoolthatdayexhaustedIhadtostayupreallylatetofinishthemall. ThenextdayatschoolIgotarudeawakeningI'dtotallyforgottentoprepareforthe3onRomeoandJulietwhichI'dtake4mylunchhour!WorsestillIhad5thein-classdiscussionandallthenotes.WhenlunchcameIwenttotheEnglishroomtofacemycertaindoom厄运.AllIcoulddowastryto6onthequestionsIdidn'tknow. AsitturnedoutIdidn'tknowthemajorityofthequestions.Iwasjustabouttogive7whenmypencilaccidentallyfellandbroke.StandingbytheblackboardsharpeningmypencilI8downandthereinfullviewlaytheanswersheetforthetest!Whatgoodfortune!Icankissgood-byetoallmy9offailingthetest!Myheartstartedbeatingandmybrain10Yes!Readovertheanswers-quickly!ThiswasquicklyfollowedbyanothervoiceNo!You'llgetcaught!MymindturningbackandforthYes!No!Yes!No!…Thiswentonfortenofthe11secondsinmyentirelife. FinallyIdecidedtofinishthetestonmyownwithout12!Iwassatisfiedwithmydecisionbutpretty13Ihadfailedthetest. ThenextdaywhenIwalkedintotheEnglishroommygreatjoyofhavingbeenan14soulchangedintoawaveofdoomasIsawmytestpaperlyingfacedownonmydesk.Iknewwhatawaitedme.IstaredatitafewsecondsbeforeIgotupthe15toturnitover. Youcanonlyimaginemy16whenIlearnedthatIhadpassedthetest!Ihaveneverinmywholelifebeensohappytoseemy17aC-. Mymomsaysthevictoriesthat18themostcouragearewonwithin.NowIknow19whatshemeans.Nownotonlycanmyconscience良心resteasybutIdon'thavetoworryaboutgettingcaughtandmeetingasad20likeRomeoandJuliet. 1A.arrived B.returned C.appeared D.finished 2A.If B.Because C.Until D.Although 3A.lecture B.essay C.play D.test 4A.by B.upon C.over D.toward 5A.missed B.carried C.lost D.dropped 6A.depend B.agree C.guess D.improve 7A.in B.off C.out D.away 8A.wrote B.settled C.calmed D.looked 9A.boredom B.worries C.loneliness D.tiredness 10A.whispered B.warned C.persuaded D.chanted 11A.coldest B.saddest C.longest D.fastest 12A.suffering B.checking C.cheating D.thinking 13A.certain B.regretful C.annoyed D.relieved 14A.open B.honest C.optimistic D.energetic 15A.wisdom B.encouragement C.intention D.nerve 16A.anxiety B.shock C.fear D.appreciation 17A.paper B.credit C.rate D.grade 18A.take B.put C.find D.gain 19A.gradually B.exactly C.willingly D.seemingly 20A.film B.fact C.ending D.love
如图所示足够长的光滑水平台面M距地面高h=0.80m平台右端紧接长度L=5.4m的水平传送带NPAB两滑块的质量分别为mA=4kgmB=2kg滑块之间压着一条轻弹簧不与两滑块栓接并用一根细线锁定两者一起在平台上以速度v=1m/s向右匀速运动突然滑块间的细线瞬间断裂两滑块与弹簧脱离之后A继续向右运动并在静止的传送带上滑行了1.8m已知物块与传送带间的动摩擦因数μ=0.25g=10m/s2求1细线断裂瞬间弹簧释放的弹性势能EP2若在滑块A冲到传送带时传送带立即以速度v1=1m/s逆时针匀速运动求滑块A与传送带系统因摩擦产生的热量Q3若在滑块A冲到传送带时传送带立即以速度v2顺时针匀速运动试讨论滑块A运动至P点时做平抛运动的水平位移x与v2的关系传送带两端的轮子半径足够小
AsimpleprojecttohelpafamilyinneedstoppedLukeMickelsoninhistracks.In2012heandhisfamilywereinspiredtobuildanddonateabunkbedonebedontopoftheotherafterlearningtherewerelocalchildrenwhosleptonthefloor.ShockedtodiscoverhowwidespreadthisneedwasinhiscommunityMickelsonfoundedSleepinHeavenlyPeaceanonprofitthatbuildsanddeliversbedstochildreninneed. BomandraisedinIdahoMickelsonnow41hadathrivingcareer.Hecoachedhiskids'sportsteamsandfishedinthenearbyriver.Butwhenhemetchildrenwhoweresleepingonthefloorhispeacefullifechangedcourse. Usingsafetyguidelinesandhisdaughter'sbunkbedasamodelMickelsonstartedbuyingwoodandsuppliestobuildbedswithhisownmoney.Herecruitedfriendsandfamilymemberstohelparoundtheholidays.Aswordspreadinterestandinvolvementfromhisandothercommunitiesflooded-alongwithMickelson'sbunkbedoutput.Thatfirstprojectwebuilt11bunkbedsinmygaragehesaid.Thenextyearwedid15.Thenitdoubledeveryyear.In2017webuilt612bunkbeds. WiththemottoNokidsleepsonthefloorinourtownthenonprofitanditsmorethan65brancheshavebuiltanddeliveredmorethan1500freebedstochildrenacrossAmerica.ButalongwiththerapidgrowthMickelsonwasfacedwithatoughchoiceadvancinghiscareerorhisnonprofit.Hechosethelatterandwentfrommakinggreatmoneytozeromoney.He'sneverlookedback.IfoundthattheneedIhaveisn'tfinancialhesaid.TheneedIhaveisseeingthejoyonkid'sfacesknowingthatIcanmakeadifference. 1WhydidMickelsonsetupSleepinHeavenlyPeace? A.Tohelpthepoorchildren B.Tomakeabigfortune C.Toinspirehiscommunity D.Togetmoredonations 2WhatdoweknowaboutLukeMickelson? A.Hehadhisownfishfarm. B.Hechangedhiscareerfromtimetotime C.Heusedtosleeponthefloorwhenhewasakid. D.Heoriginallyhadarelaxingandpleasantlife 3HowdidotherpeoplereacttoMickelson'sproject? A.Theyshowedlittleinterestinit B.Theyweresupportiveandinvolvedinit. C.Theyweredoubtfulaboutthesafetyofthebunkbed. D.Theyvolunteeredtobuybedswiththeirownmoney 4WhatisMickelson'sattitudetothenonprofit? A.Ambiguous. B.Defensive. C.Cautious. D.Positive
LastfallIhappenedtooverhearastudenttellingtheothershehaddecidednottosignupforanintroductoryphilosophycourse.Thedemandsofhismajorhesaidseriouslymeantheneededtotakepracticalcoursesandenlightenmentwouldsimplyhavetowait.Fornowemployabilitywasthemostimportant. Thestudents'conversationfitsintoalargeralarmingnarrativeabouttheroleofthehumanitiesinhighereducation.InatimeofdizzyingtechnologicalachievementandofrapidscientificinnovationscepticsofthehumanitiesmayquestiontheusefulnessofstudyingAristotletheItalianRenaissanceorChinesefiction. ActuallyIregretnotinterruptingthatstudenttoarguefortakingthatintroductoryphilosophycourse.IwouldhavestartedbyremindinghimthatformuchofAmerica'shistorycollegegraduateswerenotconsideredtrulyeducatedunlesstheyhadmasteredphilosophyliteraturepoliticaltheoryandhistory.Thekeyroleofhighereducationwastoinvitestudentsintotheconversationsaboutmatterslikewhatitmeanstobealiveandthedefinitionofjustice.Fosteringengagementwiththesesubjectsisstillanessentialpartoftheuniversity'sfunctioninsociety. Iwouldhavealsomentionedtothestudentthathewasmisinformedaboutthejobmarket.Itistruethatmanyemployersarelookingforgraduateswithspecializedtechnicalskillsbuttheyalsolookforothercapabilities.Astheworldistransformedbyartificialintelligencemachinelearningandautomationtheuniquehumanqualitiesofcreativityimaginationandmoralreasoningwillbetheultimatecoinoftherealm.Alltheseskillsaredevelopedinhumanitiescourses. FurtherIwouldhavearguedthatwhileadegreeanchoredinthesciencesisanimportantpreconditionformanyjobsitisnottheonlyroute.LooknofurtherthanthefoundersofcompaniessuchasLinkedInSlackandFlickrwhoareamongthemanytechbusinesspersonswithdegreesinthehumanitiesandwhocreditthattrainingfortheirsuccess. Contrarytothewidelyheldbeliefthathumanitiesmajorshaveahardtimegettingjobsrecentstudiesshowthatthosewithhumanitiesdegreesaresuccessfulintheworkplaceexperiencinglowratesofunemploymentandreportinghighlevelsofjobsatisfaction.Theratiobetweenaveragemedian中位数incomesforhumanitiesdegreeholdersandthosewithbusinessengineeringandhealthandmedicalsciencesdegreeshasbeenshowntonarrowoverthecourseofacareer. Thecaseforthehumanitiescanalsobeunderstoodinlesstransactionaltermsandmoreasafoundationalpreparationforalifewelllived.Ahumanitieseducationplaysavitalroleinencouragingcitizenstoleadanexaminedlife.Itfosterscriticalthinkingself-reflectionempathyandtolerancetheusefulnessofwhichonlybecomesmoreapparentasonenavigateslife'schallenges. ByallmeansstudentsshouldtakecoursestheythinkpracticalandfollowtheirinterestsbutiftheyalsomakeapointofstudyingtheliteratureoftheRenaissanceorresearchingintomodernpoetryoreventakingintroductoryphilosophywewillallbenefit. 1Whatdothestudents'conversationshow? A.Studentsfeelemploymentdifficult. B.Studentsthinkphilosophylessimportant. C.Studentsfindscientificinnovationamazing. D.Studentsconsideruniversitycoursesunsatisfying. 2WhatdoestheunderlinedpartinParagraph4probablymean? A.Highlyvalued. B.Equallyapplied. C.Strictlyassessed. D.Greatlyimproved. 3Theauthormayagreethathumanities. A.discoverstudents'artisticability B.preparestudentsforgraduation C.raiseawarenessofsocialstatus D.providegreatinsightsintolife 4Whichofthefollowingshowsthedevelopmentofideasinthepassage? A. B. C. D. IIntroductionPPointSpSub-point次要点CConclusion
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