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如图所示，边界水平的条形匀强磁场区域，磁场方向与竖直平面垂直，边界间距为L；一个边长为L的正方形导线框竖直向上运动，某时刻上边恰好与磁场的下边界重合，此时线框的速度大小为v0；经时间t1线框的上边与...
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高三下学期物理《》真题及答案
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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
Peopledohavedifferentideasaboutwhat1wear.Whileyoungpeopletendtoconsidermoreaboutfashionpersonalityandhowtheylookwhen2chooseclotheselderlypeoplepay3greatattentiontowhethertheyappearrighttheyfeelcomfortableaswellaswhetherthematerialisworth4price.Howpeoplegetdressedalsochangesovertime.TakeChina5anexample.Inthe1960'sand1970'stherewerepracticallyonlytwoorthreecolorspeoplewore﹣bluegreenandgray.Thestylesoftheclothes6bealsoverydull.Inthe1980'syoungpeoplewouldonlywear7wasinfashion.8recentwehavecometounderstandthatthewayyoudress9youisareflectionofyouroccupationyourbackgroundandyourpersonality.Soweseedifferentpeopleweardifferentclothesaccordingtooccasionstheirlikesand10feel.
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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.
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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．
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