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某校物理兴趣小组决定举行遥控赛车比赛．比赛路径如图所示，赛车从起点A出发，沿水平直线轨道运动L后，出B点进入半径为R的光滑竖直圆轨道，离开竖直圆轨道后继续在光滑平直轨道上运动到C点，并能越过壕沟．已...
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高三下学期物理《》真题及答案
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某校物理兴趣小组决定举行遥控赛车比赛比赛路径如图所示赛车从起点A.出发沿水平直线轨道运动L.后由B.
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圆x2+y2＝1与直线y＝kx﹣3有公共点的充分不必要条件是
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若函数在区间12上单调递减则实数a的取值范围为
设函数fx＝|2x+1|﹣|x﹣2|． 1求不等式fx＞2的解集 2若恒成立求实数t的取值范围．
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ManyofusremembercloneddinosaursrunningwildinthefilmJurassicPark.Andtheideaofusingtechnologytoreviveextinctspecieshaslongfascinatedwritersdirectorsandscientists.AccordingtoTheTelegraphwoollymammoths长毛猛玛象maywalktheearthoncemorenowthatscientistshavetakenanothersteptowardrealizingalong﹣helddream﹣recreatingtheirDNA.Mammothsbecameextinctaround10000yearsago.HoweversincethediscoveryofnearperfectpreservedremainsinArcticpermafrost北极冻土带inMay2013avarietyofresearchstudieshavebeencarriedoutsince.GeneticistsanalyzedDNAfromtheremainslookingforgeneswhichseparatedmammothsfromelephantssuchashairinessandearsize.Theythenusedtheresultstoreproduceexactcopiesof14mammothgenes.'Itisthefirsttimethatmammothgeneshavebeenalive﹣althoughsofarithasonlybeendoneinthelab'GorgeChurchleadresearcheroftheprojecttoldtheSaturdayTimes.ChurchthenusedanewtechniquewhichallowsscientiststoeditDNAcarefullyreplacingsectionsofelephantDNAwiththemammothgenes.So'wenowhavefunctioningelephantcellswithmammothDNAinthem'hesaid.HoweverChurchruledoutthepossibilityofbringingthemammothsbacktolifeviacloningfromfrozenremains.Hesaidhe'preferredtofocusonrebuildingthefullmammothgenomebyanalyzingDNAfrompreservedremainsandputtingitintothecellsofitsclosestlivingrelative﹣theAsianelephant'reportedTheTelegraph.Churcharguedthatthereturnofthewoollymammoths﹣orratherthereturnofsomethingverysimilar﹣couldhelpbringbackfragile脆弱的ecosystems.Howeversomescientistsbelievethatbringingbackthemammothwouldbeunethical.'What'sthemess?Wecanbeasirresponsiblewiththeenvironmentaswewantthenwe'lljustclonethingsback?'AlexGreenwoodanexpertonancientDNAtoldtheSundayTimes'Moneywouldbebetterspentfocusingonconservingwhatwedohavethanspendingitonananimalthathasbeenextinctforthousandsofyears.'1.Whatcanweinferfromthepassage?A.Scientificstudiesonrevivingextinctspeciesdidn'tbeginuntilMay2013.B.Thetechnologytoreviveextinctspeciesisalreadymature.C.ChurchandhiscolleaguestriedtoreproducemammothDNA.D.Churchmanagedtolistallthegenesseparatingmammothsfromelephants.2.AccordingtothetextwecouldconcludethatChurch.A.hadseriousdoubtsaboutdiscoveringthefullmammothgenome.B.aimedtoclonetheextinctmammothfromfrozenremainsonhisown.C.couldhelpsavefragileecosystemifbingingbacksomethingsimilartothemammoth.D.believetheirsuccessfulexperimentcouldchangetheAsianelephantintomammoths.3.AlexGreenwoodbelievesthat.A.itisunnecessarytoworryabouttheextinctionofAsianelephantsatpresent.B.it'snecessarytobringbackspeciesbeneficialtohumansfromextinction.C.thereturnofthewoollymammothwouldhelptobalanceecosystems.D.it'smoreimportanttoprotectpresentspeciesthantobringbackextinctones.4.What'sthebesttitleofthepassage?A.Mammothscouldreturn?B.Mammoths'returnhelpsecosystems.C.Mammothshavebeenextinctforages.D.Mammoths'clonefromfrozenremains.
若双曲线的实轴长是10则此双曲线的渐近线方程为．
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设曲线C是双曲线则“C的方程为”是“C的渐近线方程为y＝±2x”的
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变量xy之间的一组相关数据如表所示 若xy之间的线性回归方程为＝x+12.28则的值为
若函数为奇函数则实数a＝．
若则|z|＝
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ItwasthesecondtimethatIhavebeentothehospital.1itwasaweekdaytherewerestilllotsofpeopletherewhich2meatfirst.Mostofuslivehealthylivessoperhapsweneverrealizethattherearesomanypeople3painandtorment.AsIwalkedalongthehallwayIsawavarietyofpeopleandfeltmanythings4throughmymind.Iheardasmalllaughofjoyand5myheadtoseewhathadhappened.Awomanwasstandinginthehallwaysayingtoherhusbandbeside:'6isokay!Yourbabyismovingaroundlikealwaysinmybelly肚子.'Themansmiledandsaid:'Ourchildmusthavea7likemine.'Theysmiledateachotherandwalked8away.Asmallnew9makessomanypeoplesohappy.Iwas10whymyparentsalwayslookedso11whenItoldthemthatIfeltunwell.Parents12theirchildren'slivesmoredearlythantheirown.Anothernoise.Iheardanursesay:'Weare13theoperation.Don'tworry.'AnoperationissomethingthatIhavefearedeversince14.Ifearthe15ofit.Ifanoperationis16everybodyishappy.Butifnottheworldseemsto17.Afterallweknowthepeoplearounduswillleaveourworld18.Facingtheforcesoflifeanddeathweareas19asdropsofwaterinanoceanonlytheretobepushedbackandforth.Ifeltmyself20inthatexactmomentandplaceinmydeepestthoughts.1.A.As B.Because C.Although D.When2.A.frightened B.excited C.worried D.surprised3.A.goingfor B.goingthrough C.goingover D.goinginto4.A.flash B.appear C.form D.fly5.A.held B.raised C.rose D.kept6.A.Nothing B.Something C.Anything D.Everything7.A.hobby B.behavior C.character D.movement8.A.quietly B.happily C.sadly D.hurriedly9.A.life B.boy C.daughter D.person10.A.realized B.told C.recognized D.reminded11.A.down B.unhappy C.worried D.nervous12.A.see B.treat C.look D.think13.A.getting B.experiencing C.doing D.carrying14.A.childhood B.fatherhood C.adulthood D.neighborhood15.A.danger B.failure C.certainty D.uncertainty16.A.good B.successful C.quick D.easy17.A.darken B.change C.brighten D.stop18.A.early B.temporally C.permanently D.quickly19.A.abundant B.important C.necessary D.unimportant20.A.growup B.riseup C.growold D.growcrazy
已知函数fx＝sin2ωx+cos2ωx+bω＞0的一条对称轴为且最高点的纵坐标是． 1求ω的最小值及此时函数fx的最小正周期初相 2在1的情况下设求函数gx在上的最大值和最小值．
函数fx＝sinωx+φω＞0|φ|＜的部分图象如图所示将y＝fx的图象向右平移个单位长度后得到函数y＝gx的图象． 1求函数y＝gx的解析式 2在△ABC中角ABC满足2sin2＝gC++1且其外接圆的半径R＝2求△ABC的面积的最大值．
圆x2+y2﹣2x﹣8y+13＝0的圆心到直线ax+y﹣1＝0的距离为1则a＝
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