首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
热门试题
更多
如图所示光滑固定的竖直杆上套有一个质量m＝0.4kg的小物块A不可伸长的轻质细绳通过固定在墙壁上大小可忽略的定滑轮D连接物块A和小物块B虚线CD水平间距d＝1.2m将物块A从C处由静止释放当物块A到达细绳与竖直杆的夹角为37°的E点时物块A的速度最大．现在物块B的下端加挂一个物块Q使物块A从E点由静止释放沿杆上升并恰好能到达C处．不计摩擦和空气阻力cos37°＝0.8sin37°＝0.6重力加速度g取10m/s2．求 1物块B的质量M． 2物块Q的质量m0．
WhyDoPeopleBlinkTheirEyes Peopleblink眨眼theireyestensofthousandsoftimeseveryday．Scientistshavelongbelievedblinkingwasaninvoluntarymovementandservedmainlytokeeptheeyeballswet．Butanewstudysuggestsithasamoreimportantpurpose． AninternationalteamofscientistsfromtheUniversityofCaliforniaatBerkeleystudiedtheblinkingofhumaneyelids．ThejournalCurrentBiologypublishedtheirfindings．Theteamsaidtheyfoundthatblinkingrepositionsoureyeballssowecanstayfocusedonwhatweareseeing．Theysaidthatwhenweblinkoureyelidstheeyesrollbackintotheirsockets﹣thebonyareathatsurroundsandprotectstheeyes．Howevertheresearchersfoundtheeyesdon'talwaysreturntothesameposition．Theysaidthiscausesthebraintotelltheeyemusclestoreorganizeoureyesight． GerritMausistheleadwriterofthereport．HeservesasanassistantprofessorofpsychologyatNanyangTechnologicalUniversityinSingapore．MaussaidOureyemusclesarequitesluggish迟缓的andimprecisesothebrainneedstoconstantlyadaptitsmotorsignalstomakesureoureyesarepointingwherethey'resupposedto．Ourfindingssuggestedthatthebrainmeasuresthedifferenceinwhatweseebeforeandafterablinkandcommandstheeyemusclestomaketheneededcorrections．Theresearcherssaidthatwithoutsuchcorrectionsoursurroundingswouldappearunclearandevenjumpy．Theysaidthemovementactslikeasteadicam摄影稳定器ofthemind． Theresearcherssaidtheyaskedvolunteerstositinadarkroomwhilestaringatasmalldotonaflatsurface．Theyusedspecialcamerastofollowthevolunteer'sblinksandeyemovements．Aftereachblinkthedotwasmovedonecentimetertotheright．Thevolunteersdidnotnoticethisbutthebraindid．Itfollowedthemovementanddirectedtheeyemusclestorefocusonthedot．Afterthedotwasmovedinthisway30timesthevolunteers'eyeschangedtheirfocustotheplacewheretheypredicteditwouldbe． ProfessorMaussaidEventhoughparticipantsdidnotconsciouslyregisterthatthedothadmovedtheirbrainsdidandadjustedwiththecorrectiveeyemovements．Thesefindingsaddtoourunderstandingofhowthebrainconstantlyadaptstochangescommandingoureyemusclestocorrectforerrorsinourbodies'ownhardware． 63．AccordingtothenewstudyblinkingeyescanB． A．servetokeeptheeyeballswet B．repositioneyeballstostayfocused C．consciouslycorrecteyemovements D．makeoureyesadapttomotorsignals 64．FromtheexperimentwecanlearnthatD． A．volunteerscouldseethemovingdotwithspecialcameras B．theeyeballscouldstayintheplaceastheywerepredicted C．participantswereawareofthedot'smovementstotheright D．thebraincommandedtheeyemusclestorefocusonthedot 65．TheunderlinedwordregisterinParagraph5probablymeansA． A．realizeB．refocusC．reserveD．reason 66．ThispassageshowsthatC． A．eyemusclesarequiteinactiveandimprecise B．theresearchisofgreatvalueintheeyemovement C．thebrainplaysanimportantroleinseeingthingsclearly D．volunteerscontroltheirblinkstofollowthechangesofthedots．
FacebookIsaBigWaster Duringthefirstdecadeofthe21stcenturyapopularandnewwordhascomeintoourvocabulary﹣Facebook．ThisisthemostpopularsocialnetworkingwebsiteontheInternet．71GYoucansendmessagestoyourfriend'selectronicwallputupastatussayingsomethinglikeGoingtothemallIneedtogetanewpairofshoesorit'sfinallytheweekend!． Inspiteofthebenefititdoesoncommonpeopleitistruethatthissocialnetworkisabigwaster．Thereareabout350millionactiveusersonthiswebsiteand67%ofthemarebetweentheagesof13﹣25．Morethan35millionusersupdatetheirstatuseveryday．72A ThehighestagegroupwhouseFacebookareteenagers．Mostofthemkeepthewebsiterunningwhenevertheyareusingthecomputeriftheyaren'tinschoolorwhentheyaren'tasleep．Facebookisjustchangingthenewgenerationofyoungstersunconsciously．Theteenagelifeisoneofthemostimportantstagesoflife73BItisadistractiontotheirmindaswell．NowadayswhenalltheirhomeworkandresearchareonICT信息技术theywouldeasilyswitchtoFacebookjusttocheckiftherewasanythingupdatedamongtheirfriends． Facebookisalsowherepeoplecanseethegossipamongtheirfriendsvirtualargumentsrelationshipstatusandupdateswhoisinwhosetopfriendsyoucanbecomefanofanythingjoingroupspostpicturesandvideosplaychildishgamesinvitefriendstopartiesoreventsandalotmore．Generallyallthesewouldjustdisturbpeopleintolivinglifetothefullest．It'snotjustteenswhobecomeaddictedevengrown﹣upsdo．Anaveragepersonspendsabout55minutesonFacebook．74CTechnologymightbetakingoverpeople'slife．FurthermorepeoplewhouseFacebookthroughtheirmobilephonesare50%moreactiveonFacebookthannon﹣mobilephoneusers．ThisshowspeopleusingFacebookontheirphonesaswellascomputersjustcan'tstandbeingawayfromthewebsite．Facebookislikecracktosomefolk． 75DThiswouldmakethemthinkhowlifeislikewithoutsayingwhat'sontheirmindtoalltheirfriendsontheInternet．Abreakwouldalsomakethemmoreactivelikesocializinginperson．Thiswouldfinallyhelpthemfocusbetterinschoolorinwork．Althoughabout80%ofpeoplewhotakeabreakwouldcomebacktoFacebookwithindays． A．And2.5billionphotosareaddedeachmonth． B．WastingitonFacebookisnotencouraginginanyway． C．Thisstatisticisn'tthatbadbutsomepeoplespendabout3﹣5hours． D．ItistimepeopleshouldtakeabreakfromFacebookonceinawhile． E．AsaresulttheaverageFacebookusershave130friendswhotheysharelinkswith． F．UsuallywhenpeoplehearthewordssocialnetworkingtheirbrainsautomaticallygotositessuchasTwitterorFacebook． G．ThemainideaofFacebookisthatyoucankeepintouchwithallyourfriendsaroundtheworldwhohaveFacebook．
1+x5的展开式中项x2的系数是用数字作答．
王斌同学在解答问题“同时掷两个骰子计算向上的点数之和是5的概率是多少”时给出了如下答案 记{mn}为投掷两个骰子向上点数分别为mn 则投掷两个骰子的所有可能结果为 {11}{12}{13}{14}{15}{16}{22}{23}{24}{25}{26}{33}{3.4}{35}{36}{44}{45}{46}{55}{56}{66}共计21种． 其中“向上的点数之和是5”的有{14}和{23}共2个． 所以所求概率为． Ⅰ你认为王斌同学的解答正确吗简述理由． Ⅱ如果王斌同学的解法不正确请在下面给出正确的解答．
下列说法正确的是
物理学的发展丰富了人类对物质世界的认识推动了科学技术的创新和革命促进了物质生产的繁荣与人类文明的进步．下列表述错误的是
已知函数则函数fx的导函数f'x等于
如图所示一粗细均匀的铜制线圈宽度为l线圈从某一高处自由下落进入一水平的有界匀强磁场区域然后穿出磁场区域磁场上下边界的距离为3l线圈的运动过程中线圈的上下边始终与磁场的边界平行线圈穿过磁场的过程中形状不变则线圈穿过磁场的v﹣t图象可能是图中的
CherishtheMomentswithOurParents Therewassomethinginanelderlywoman'sbehaviorthatcaughtmyeye．UnsureofherstepsthewomanmovedslowlyalongwithayoungerwomanwhoIguessedwasherdaughter．Thedaughterwasrollinghereyesandcheckingherwatcheveryfewseconds． TheolderwomanlefttheyoungeroneandbegantotickthroughtheDVDsonthenearestshelf．WithouthesitationIwalkedoverandaskedifIcouldhelpherfindsomething．Thewomansmiledatmeandshowedmeatitleonapieceofpaper． RatherthanrushofftolocatetheDVDforthewomanIaskedhertowalkwithmesoIcouldshowherwhereshecouldfindit．LookingbackIthinkIwantedtoenjoyhercompanyforamoment．HermovementsremindedmeofmyownmotherwhohadpassedawaythepreviousChristmas． Aswewalkedthewomanseemedgladoftheunrushedcompanyandcasualconversation．Wefoundthemovieandshetoldmeitwastheoneshe'denjoyedwhenshewasherson'sageandthatshehopedhewouldenjoyitasmuchasshehad．Maybeshesaidhecouldenjoyitwithhisownyoungchildren． Iaccompaniedhertothequeueatthecashier．AsthecashierputtheDVDintoaplasticbagIwentovertotheyoungerwomanwhowasstilltappingherfootatthefrontofthestore． IsthatyourmomIasked． Ihadexpectedhertotellmeitwasnoneofmybusiness．ButsherolledhereyesandsaidYeah．Therewasannoyanceinherreply．StillwatchingthemotherIsaidMindsomeadvice Goaheadsaidthedaughter． IsmiledtoshowherIwasn'tcriticizingCherishherIsaidWhenshe'sgoneit'sthelittlemomentsthat'llcomebacktoyou．Momentslikethis．Iknow． Itwastrue．ImissedmymomstillandrememberedwithsadnessthemomentswhenI'dusedmyimpatiencetomakeherlifemiserable． Theelderlywomanmovedslowlybacktoherdaughter．Togethertheymadetheirwaytowardthestore'sexit．Theystoodthereforamomentsidebysidewatchingtherushoftheholidaycurrent．Thenthedaughterglancedoverandslowlyplacedherarmwithapparentlyunaccustomedaffectionaroundhermother'sshouldersandgentlyguidedherhome． 56．ThedaughtercheckedherwatchfrequentlybecausesheC． A．hadtowaitforafriend B．wantedtobuyanewwatch C．wasimpatienttoshopwithhermom D．wasuninterestedinwatchingtheDVD 57．FromParagraphs3and4weknowthatD． A．theelderlywomanhadn'tseenthemoviebefore B．theelderlywomanfoundherson'sfavoritemovie C．theauthorandtheeldlywomanhurriedtofindtheDVD D．theauthorandtheelderlywomanenjoyedeachother'scompany 58．WecanlearnfromthepassagethatD． A．theauthorhadtreatedhermomverywell B．theelderlywomanlookedliketheauthor'smom C．theauthorscoldedthedaughterforherbehavior D．thedaughterchangedherattitudetowardhermom．
假设你是红星中学高三1班的学生李华．下面四幅图描述了你们带留学生Jack看中医TCM的经历．请你根据图片的先后顺序为校刊英语角写一篇短文介绍你们带Jack看医生前后的全过程． 注意词数不少于60． 提示词把脉feelone'spulse
以点12为圆心且经过点20的圆的方程为
函数的最小值是．
已知函数fx=m+1x+lnxm∈R． Ⅰ当m=-2时求函数fx的单调区间和函数的最大值 Ⅱ若函数在区间12内有且只有一个极值点求m的取值范围．
若函数y=fx的定义域为M={x|-2≤x≤2}值域为N={y|0≤y≤2}则函数y=fx的图象可能是
HearingtheSweetestSongs MyparentssaidIlostmyhearingasababybutIknewIhadn'tlostanything.Noneofmypartshaddroppedoff.NothinghadchangedIcouldhearmusicthatwascloseenoughtome.Icouldalsohearmymomwhenshewasinthesameroom.IcouldevenhearmycatpurrifIputmygoodearontopofhim. Iwasn'tawareofanyhearinglossuntilIbegantowearahearingaidwhenIstartedlivingalone.Inoticeditruinedmypeaceofmindpencilstappingphonesringingandrefrigeratorshumming.ThenIbegantodiscovermanythingsIcouldn'tdo.Icouldn'ttellwheresoundscamefromnorcouldItellfirealarmsfromburglaralarms.IoncemissedajobinterviewbecauseImisheardtheaddressonthephone.ForthefirsttimeIhadtoadmitthatIhadlostsomething. Unlikeawheelchairmydisabilitydoesn'tannounceitself.WhenIgotjobsIchosetokeepitasasecret.OnedayabusinessfriendsaidNicolettesometimesinmeetingsyouanswerthewrongquestions.Peopledon'tknowyoucan'thearsotheythinkyou'restrangestupid﹣orjustplainrude.Itwouldbebettertojusttellthem.ButIknewifItoldpeoplemightseeonlymydisabilityandtheymightforgetthatIwasalsoawriterapainterandagoodgardener.Ifeltdisabledandhelpless. ThisbotheredmetillImetmyhusband.OnemorningattheshoreIwaslisteningtothesoundsoftheseawhenmyhusbandsaidHearthebird?Whatbird?IlistenedharduntilIheardatinysound.Ifhehadn'tmentioneditIwouldneverhavenoticedit.AsIlistenedslowlyIbegantohear﹣orperhapsimagine﹣adistantsong.DidIreallyhearit?Orjustheardinmyheartwhathesharedwithme?Irealizedthatsongsimaginedwereassweetassongsheardandsongssharedweresweeterstill. Thissharingiswhatboththedisabledandnon﹣disabledwant.Everyoneofusifwelivelongenoughwillbecomedisabledinsomeway.Let'sshare.Nowjustletmeseeyourlipswhenyouspeak.Andaskwhatyouwanttoknow.Theseareconversationsweallshouldhaveandit'snotthathardtobegin. 60.Whentheauthorworethehearingaidshe. A.feltbetterpreparedforthejobinterviews B.wasabletoenjoydifferentsounds C.experiencedasenseofloss D.wasteasedbyothers 61.Shedidn'ttellherdisabilitytoothersbecause. A.peoplemightfocusonherhearingloss B.shecouldgettheworkdoneasabled C.peoplemightbecuriousaboutit D.shewantedtodomorejobs 62.WhydidNicolettewritethepassage? A.Todrawpeople'sattentiontothehearingproblem. B.Totellpeoplenottotreatthedisableddifferently. C.Torememberthechallengesshefaced. D.Toshowhowmuchshemissedbefore.
如图甲所示为探究加速度与质量关系的实验装置示意图． 1在平衡摩擦力后保持悬挂钩码的质量不变改变小车上砝码的质量从而改变小车和砝码的总质量根据不同质量下打出的纸带求出对应的加速度其中某次实验中打出了如图乙所示的纸带打点计时器所用电源的频率为50Hz则这个加速度值a＝m/s2． 2某同学把实验得到的几组数据列在图的表中为了更直观地描述小车的加速度与其质量的关系请你根据图丙的数据在图丁中画出a﹣图象． 3根据你作出的a﹣图象可知加速度a与填“m”或“”成正比．
直线x-y+3=0的倾斜角是
首都师范大学数学科学学院在阶段测试中要考查六个学科已知数学分析考试必须安排在首场且高等代数与复变函数不能相邻则这六个学科不同的考试顺序总共有种
为了解水稻价格的波动情况某人对ABC三个城市中某一天的水稻价格进行调研得到三个城市的所有销售点的水稻价格元/吨数据如表所示 Ⅰ甲以B城市5个销售点水稻价格的中位数作为购买价格乙从C城市4个销售点中随机挑选2个了解水稻价格．记乙挑选的2个销售点中水稻价格比甲的购买价格高的个数为X求X的分布列及数学期望 Ⅱ如果一个城市的销售点水稻价格方差越大则称其价格差异性越大．请你对ABC三个城市按照水稻价格差异性从大到小进行排序只写出结果．
第一节 假设你是红星中学高三学生李华你的美国笔友Chris在给你的邮件中提到他最近在准备SAT考试美国高考心理压力很大很苦恼希望得到你的帮助.请你给他回信内容包括 1.安慰对方 2.分析心理压力过大会导致的后果 3.给出相应的建议及其理由. 注意词数不少于50. DearChris Yours LiHua.
下列说法正确的是
Thesubtitleofmy1995bookEmotionalIntelligenceEIreadsWhyItCanMatterMoreThanIQ.ThatsubtitleunfortunatelyhasledtomisunderstandingsofwhatIactuallysay.SomepeopleevenmaketheabsurdclaimthatEIaccountsfor80percentofsuccess. IwasremindedthisagainwhenlookingthroughcommentsonanAustralianstudythatfailstofindmuchofaconnectionbetweenteenagers'levelofemotionalintelligenceandtheiracademicachievements.Formethere'snosurprisehere.ButforthosemisguidedpeoplewhothinkIclaimEImattersmorethanIQforacademicachievementitwouldbeaGotcha!moment. Myargumentisactuallythatemotionalandsocialskillsgivepeopleadvantagesinareaswheresuchabilitiesmakethemostdifferencelikeloveandleadership.EIdoesbetterthanIQinsoftareaswhereintelligencemattersrelativelylittleforsuccess.ThatsaidanothersuchareawhereEImattersmorethanIQisinperformanceatworkwhencomparingpeoplewithroughlythesameeducationalbackgroundslikeMBAsoraccountants. IQisamuchstrongerpredictorthanEIofwhichjobsorprofessionspeoplecanenter.Howeverhavingenoughintelligencetoholdagivenjobdoesnotbyitselfpredictwhetheronewillbeastarperformerorrisetomanagementorleadershippositionsinone'sfield.Inpartthisisbecauseeveryoneatthetoplevelofagivenprofessionhasalreadybeenexaminedforintelligence.AtthosetoplevelsahighIQbecomesabasicabilityoneneededjusttogetintoandstayinthegame. TheoneplaceIexpectwewillbeseeingmoredatashowingarelationshipbetweenskillsintheemotionalandsocialareaandschoolperformancewillbeinstudiesofchildrenwhohavegonethroughsocial/emotionallearningSELprograms.Thesecoursesgivestudentstheself﹣managementskillstheyneedtolearnbetter.Andsotothedegreethatadvantagepromoteslearningtheyshoulddobetteronacademicachievementscores.AstudyfromtheUniversityofIllinoisfindsarounda10percentincreaseinachievementtestscoresamongthesestudents.ProbablytheSELprogramswouldalsohavemeanthigherscoresontheparticularassessmentofEIusedintheAustralianstudyandsoiftheyhadtestedsuchchildrentheremaywellhavebeenapositiveconnection. SolearningseemstobeanotherareawhereEImaymatter﹣whethermorethanIQisaquestionbasedonexperience. 67.Theauthorwritesthepassageto. A.statehisnewopiniononIQandEI B.explaintheimportanceofIQandEI C.clearupsomemisreadingofhisbook D.argueforhisstudyintoschoollearning 68.AccordingtotheauthorEImattersmorethanIQfor. A.familyrelationsbeingpromotedatwork B.beingaleaderreceivinganMBAdegree C.winningaquizbecomingastarperformer D.becominganaccountantgettinganinterview 69.Theauthormightagreethat. A.intelligencemattersgreatlyforsuccess B.thesubtitleofhisbookiseasilymisunderstood C.EImattersmorethanIQforacademicachievement D.IQdeterminesone'sbasicabilitytoenteracertainfield 70.WecanlearnfromParagraph5that. A.thetwosamestudieshaveoppositefindings B.theSELprogramsimprovestudents'scoresrapidly C.students'schoolperformanceisdecidedbytheirEI D.theSELprogramsattempttopromotelearningwithEI.
LookingUp IcanstillrememberthewaymytennisshoeslookedasIstareddownatthemfeelinganxiousaboutwhatwasabouttotakeplace.Itwastimefortheweeklyeleventh﹣gradevolleyballgame.IknewIwouldneverbethebest36onanyteam.ButeveryweekIstaredatmyshoesandsimplywishedIwouldn'tbepicked37.AndyetIwaslastalmosteverytime.Noteamwantedthegirlwhoalways38theballandmissedtheeasyserves. YearslaterIrealizedhowmuchthosemomentsof39hadaffectedme.Ibegantoexpectthe40ineverysituationrepeatedlytellingmyselfthatIjustwasn'tgoodenough.Igrewupstaringatmy41. Allthatbeganto42duringthesummervacationinhighschool.Mymom'ssisterAuntKarenofferedmeapart﹣timejob.IhadalwaysadmiredAuntKaren43shewassuccessfulandledsuchanexcitinglife.Hergoodmannerandwarmsmileweretotallydifferentfromthe44wayIapproachedtheworld.Butthatsummershetaughtmetolookatthings45. AuntKarensaidthatthesecret46successcomesfromtheinsidenottheoutside.Iwasshockedtolearnherexperiencehadbeensimilartomine.Shehadn'tbeengoodat47either!AuntKarensaidshefinallyrealizedwhatotherpeoplethoughtofherdidn't48asmuchaswhatshethoughtofherself.Shetoldmewhenshestartednoticingherowngoodqualitiesshe49beingsoself﹣critical. SothatsummerItookher50toheart.IlistenedtowhatIwassayingtomyselfanddecidedtofocusmoreonthegood.ForexamplewhenImisfiledanimportantpaperI51myselfofalltheotheronesIhadfiledcorrectly.AndwhenIwasshownthedirtyclosetIsaidtomyselfthatIwouldbegreatat52it.BeforelongIhadlearnedavaluablelesson.53thinkingactuallyworks! BythetimeschoolstartedthatfallIwasmuchmore54.Iwentalongwithpeoplearoundmewithatotallydifferentattitude.Whenmychemistryteacherannouncedthatweshouldeachfindalabpartner55lookingdownatmyshoesIlookedupandsmiled.Anddoyouknowwhathappened?Averynicegirlimmediatelyaskedmetobeinonegroup! 36. A.player B.teacher C.worker D.manager 37. A.fast B.soon C.only D.last 38. A.liked B.dropped C.sold D.studied 39. A.relaxation B.celebration C.rejection D.discussion 40. A.worst B.best C.latest D.least 41. A.hands B.shoes C.shorts D.legs 42. A.change B.continue C.settle D.grow 43. A.if B.unless C.until D.because 44. A.proper B.nervous C.careless D.comfortable 45. A.kindly B.seriously C.carefully D.differently 46. A.to B.with C.from D.at 47. A.chemistry B.language C.sports D.computer 48. A.stand B.matter C.cost D.expect 49. A.minded B.practiced C.stopped D.suffered 50. A.steps B.plans C.time D.advice 51. A.reminded B.rid C.warned D.accused 52. A.repairing B.cleaning C.designing D.decorating 53. A.Critical B.Deep C.Positive D.Creative 54. A.confused B.careful C.cautious D.confident 55. A.inchargeof B.inspiteof C.insteadof D.incaseof
在正方体ABCD-A1B1C1D1中当点E在B1D1与B1D1不重合上运动时总有 ①AE∥BC1②平面AA1E⊥平面BB1D1D ③AE∥平面BC1D④A1C⊥AE． 以上四个推断中正确的是
对于定义在R上的函数fx下列命题 ①若f-2=f2则函数fx一定为偶函数 ②若f-2≠f2则函数fx一定不是偶函数 ③若f-2=f2则函数fx一定不是奇函数． 其中正确的命题的序号是把所有正确命题的序号都填上．
若直线l1ax+y-l=0与直线l2x+ay+l=0平行则a的值为
下列说法中正确的是
天宫一号在距地面高度约为350公里的近地圆轨道上运动同步卫星运行的轨道距地面高度约为天宫一号距地面高度的81倍关于天宫一号和同步卫星的运动下列说法正确的是
已知两条直线mn两个平面αβ下面说法正确的是
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
湘公网安备 43130202000226号