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如图表示4﹣溴﹣1﹣环己醇所发生的4个不同反应．其中产物只含有一种官能团的反应是（ ）
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右图表示4-溴环已烯所发生的4个不同反应其中产物只含有一种官能团的反应是
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2.00分如图表示4﹣溴﹣1﹣环己醇所发生的4个不同反应．其中产物只含有一种官能团的反应是
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下图表示4—溴环己烯所发生的4个不同反应其中产物只含有一种官能团的反应是
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下图表示4—溴环己烯所发生的4个不同反应其中产物只含有一种官能团的反应是
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下图表示4–溴环己烯所发生的4个不同反应其中产物只含有一种官能团的反应是
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如图表示4-溴环己烯所发生的4个不同反应.其中有机产物只含有一种官能团的反应是
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如右图表示4溴环己烯所发生的4个不同反应其中产物只含有两种官能团的反应是
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右图表示4–溴环己烯所发生的4个不同反应其中产物只含有一种官能团的反应是
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下图表示4-溴-1-环己醇所发生的4个不同反应产物只含有一种官能团的反应是
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下图表示4－溴环己烯所发生的4个不同反应.其中产物只含有一种官能团的反应是
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下图表示4-溴-1-环己醇所发生的4个不同反应其中产物含有两种官能团的反应是
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如图所示在半径为R的半圆形玻璃砖上部有一层厚度为R的透明液体图中半圆形玻璃的上表面水平当射向圆心O的一束光与竖直方向成夹角α1＝30°时恰好没有光进入液体上方的空气中如果射向圆心O的一束光与竖直方向成夹角α2＝45°时恰好没有光进入透明液体中求 ①透明液体的折射率和玻璃相对透明液体的折射率． ②已知真空中的光速为c该光在真空中的波长为λ0求光在透明液体中的波速和波长．
OvertheyearsIhavereceivedmanyChristmasgifts.HoweverthebestoneI'veeverreceivedwaspresentedbya41IneverknewhisnameandIonlyhad42withhimforlessthan60secondsbutthemomentchangedthe43IthinkaboutpeopleandChristmas. I44BlackFridaysales.It'softenlotsofpeople45theshopsmerelytopickupbargains.Theirintentionsarecompletelyunrelatedtothe46timeofyear. ItwasoneBlackFridaymorningseveralyearsago47mywifeandIwenttothelocaldepartmentstoretopurchaseachild's48forourson.Westoodwithaverylargecrowd49forthemanagetoblowthewhistle.Onhearingthe50peoplewereallscrambling争先恐后togetthebargains.I51myopportunityandliftedoneoftheboxescontainingbikes52Ifeltsomemildresistance.Ilooked53toseeoneofthelargestgentlemenI'deverseeninmylife.Frighteningwasnottheworldto54hispresence.Iunwillingly55theboxbuttomysurprisehegentlypusheditbackin56direction.Oureyesmadecontactandhegavemea57smilesayingMerryChristmas.MywifeandIwenttothe58andpaidforthebike.AllthewayhomeIwasthinkingthatthismomentwasmuchthebestChristmasgiftI'deverreceived.Asimple59ofkindnessfromastranger60allstereotypes成见andprejudicesImayhavehad.I'llneverforgetit. 41.A.friend B.colleague C.stranger D.brother 42.A.fun B.argument C.conversation D.contact 43.A.way B.habit C.attitude D.pattern 44.A.enjoy B.forget C.hate D.expect 45.A.breakinginto B.crowding C.gettinginto D.wandering 46.A.joyful B.discouraging C.annoying D.busy 47.A.since B.when C.before D.until 48.A.toy B.book C.box D.bike 49.A.preparing B.looking C.waiting D.crying 50.A.whistle B.bell C.screams D.cheers 51.A.missed B.saw C.offered D.quitted 52.A.Gradually B.Immediately C.Occasionally D.Suddenly 53.A.down B.up C.through D.forward 54.A.introduce B.state C.describe D.say 55.A.takeaway B.takedown C.putaway D.putdown 56.A.his B.its C.my D.another 57.A.friendly B.regretful C.frightening D.special 58.A.exit B.checkout C.store D.stand 59.A.act B.behavior C.word D.movement 60.A.deepened B.replaced C.cleaned D.removed
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设abc∈R且a＞b则
i为虚数单位复数z满足z1+i=i则复数z为
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lg2+lg5==．
若关于x的不等式ax2-6x+a2＜0的解集是1m则m等于．
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已知函数fx=xex-x-ax2． Ⅰ若曲线y=fx在点1f1处的切线与直线y=-x+1平行求实数a的值 Ⅱ当x≥0时fx≥0．求实数a的取值范围．
图示为甲乙两物体的位移随时间变化关系的x﹣t图象下列说法中正确的是
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处错误每句中最多有两处.错误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∧并在此符号下面写出该加的词. 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. LookingbacktotheNationalEnglishSpeakingCompetitionItakepartinseveraldaysagoIhavealottosharetoyou. FirstlyIfeelrealdelightedthatI'vewonthefirstprizeinthecompetitionwhichmakesmetounderstandthetruemeaningoftheproverbNopainsnogains.BesidesI'veestablishedthefriendshipwithstudentsfromalloverourcountryfromwhichI'velearnedalot.Moreimportantlyparticipateinthiscompetitionhasenabledmetoovercomemyfearofspeakinginpublicthusdevelopingmyself﹣confidence.AdditionallyIowemuchthankstomyteachersandjudges.WithouthishelpIcouldn'thavedonesuchexcellentjob. TosumupIwillalwaystreasurethismeaningfulandmemorableexperiences.
Imaginelookingataviewofmountaintopsandwonderingaboutthenameofeachpeak.Suddenlyaboveeachmountaintopanameappearsonthesky.Thewordsarenotwritteninsmokebyskywritingplanes.Thewordsareactuallynotintheskyatall.Theycomefromtinycomputersincontactlenses隐形眼镜. Computershavebecomesmallerandsmalleroverthedecades.Thefirstcomputersfilledhouses.Transistors晶体管andthenchipsallowedcomputerstobecomesmallenoughtofitonadesktopthenalaptopandfinallyaphone.Whenexperimentingwithfurtherreductionsinsizedevelopersoftenhavetodealwiththelimitsofhumaneyesightwhichcontrolhowsmallthecomputerscanbeandstillpresentvisibleinformation. Onenewsolutionemploysmicroprojectors微型投影机tocreateareadabledisplay显示fortinycomputers.Thesemachinesprojectcomputerinformationontoanysurface.Thoughanimpressivebreakthroughtherearepotentialproblems.Suchpublicdisplayscanleadtoprivacyconcernsmostpeopledonotwanttheirinformationdisplayedonawallforeveryonetosee.Besidestheseprojectorsareextremelyexpensiveandtheirscreensgiveusersheadaches. BabakParvizaresearcherattheUniversityofWashingtoncreatedanothersolutioninventingascreenvisibleonlytoapersonwearingacontactlens.Parvizcreatedacomputerinacontactlensthatusesthewearer'sfieldofvisionasthedisplay.TocreatethedisplayParviztookordinarysoftcontactlenseswithawirelesslycontrolledsystem.AtsomepointParvizsaysitwillbepossibletoconnectthelenstoaremotepersonalcomputerdevicesuchasacellphoneoralaptop.Bylookinginacertaindirectionthewearersendsthecomputervisualinformationaboutwhatheorshesees.Thedevicethenusesthisinformationtopointoutthenamesofpeaks. Thesecontactlensesareinsertedandremovedinmuchthesamewayasordinarycontactlenses.Inadditionthecomputersinthelenseswon'tblockthewearer'ssightatall.AlthoughnowthecomputersarenotonlensestreatingeyesightproblemsParvizhopesthatsomedaythetechnologywillprogresstothatlevel. 63.Thecontactlensesinthetextcan. A.treateyesightproblems B.offerbeautifulviewsofnature C.projectinformationonwallsurface D.showinformationaboutwhatwearerssee 64.AccordingtoParagraph3themicroprojectors. A.putpeople'sprivacyatrisk B.savecomputerinformation C.causeseriousillnesses D.supportusers'needs 65.Accordingtothepassagethesecontactlensescontributeto. A.savingusers'expenses B.reducingcomputers'size C.limitingthefieldofvision D.guardingremotecomputers 66.Whatmightbethebesttitleforthepassage? A.TinyComputersAmazingSights B.SmallerLensesCloserViews C.ProgresstowardsClearness D.RoadtotheSmallWorld.
美国某中学举办英语暑假训练营开设以下课程cookingswimminggivingfirst﹣aidplayingfootball/basketball.假定你是李华请你写封申请信报名参加其中一门课程的学习.内容包括1.你感兴趣的一门课程2.为什么想学这门课程3.你期望从中学到什么.注意1.词数100左右2.可以适当增加细节以使行文连贯.DearSir/MadamYoursLiHua.
要测量一节干电池的电动势和内阻电动势约为1.5V内阻约为1Ω．实验室提供了以下器材 A．电压表量程3V内阻RV＝10kΩ B．电流表量程3mA内阻RG＝100Ω C．滑动变阻器R1阻值范围0～20Ω额定电流2A D．滑动变阻器R2阻值范围0～1000Ω额定电流1A E．定值电阻R3＝0.5Ω F．开关S和若干导线． 1实验中应选用的滑动变阻器为填器材前面的字母代号即选“C”或“D”． 2结合选用的器材在下面的方框里画出实验电路图． 3通过调节滑动变阻器测出多组电流表的示数I0和电压表的示数U并以I0为横坐标U为纵坐标作出如图所示的图线根据图线可求出电源的电动势E＝V结果保留三位有效数字电源的内阻r＝Ω结果保留两位有效数字．
WhenothersgetoffthetraintofinallygohomeLeonieMullerslaysbehind.That'sbecausesheisalreadyhomeThetrainisherapartmentandshesaysshelikesitthatway.TheGermancollegestudentgaveupherapartmentinspring.ItallstartedwithanargumentIhadwithmylandlordMullertoldTheWashingtonPostviae﹣mail.IimmediatelydecidedIwanttolivethereanymoreandthenIrealizedActuallyIdidn'twanttoliveanywhereanymore. Insteadsheboughtasubscription会员费thatallowshertoboardeverytraininthecountryforfree.NowMullerwashesherhairinthetrainbathroomandwriteshercollegepaperswhiletravelingataspeedofupto190mph.Shesaysthatsheenjoysthefreedomsinceshegaveupherapartment.Ireallyfeelathomeontrains.It'slikebeingonvacationallthetimeMullersaid. IwanttoinspirepeopletoquestiontheirhabitsandthethingstheyconsidertobenormalMullertoldThePost.Therearealwaysmoreopportunitiesthanonethinksthereare.Thenextadventureiswaitingjustaroundthecomer﹣providedthatyouwanttofindit. Mullerfrequentlytravelslateatnightalthoughshetriestosleepattheapartmentsofrelativesorfriends.Oftensheisaccommodatedbyherboyfriendhermotherorgrandmother.Normallywewouldhavetohavealong﹣distancerelationshipbutlivingonatrainenablesmetoseehimallthetimeMullertoldGermanTVstationSWRregardingherboyfriend.Mostofrayfriendsreallyliketheideaalthoughsomeconsiderittobequiteadventurous.Othershoweverhavereactedmorenegatively.TheyfeeloffendedbythefactthatIquestiontheordinarywayoflifeandliving. Theonlyproblem?Possessingaheadsetthatreducesmostsurroundingnoisesisimportantshesaid. 28.WhatdoweknowaboutthedirectreasonforMullerschoicetoliveontrains? A.Shehadanargumentwithherlandlord. B.Shewantedtovisitmorepeopleontheway. C.Shehadtofinishhergraduatepaperonthetopic. D.Sheplannedtoactagainsttradition. 29.AccordingtoMullerwhichisoneoftheadvantagesoflivingontrains? A.Shecanhavemoreholidays. B.Shecanescapefromcollegelife. C.Shecanpossessaheadset. D.Shecanseeherboyfriendmoreoften. 30.WhatdoesMullerwanttoexpressinParagraph3? A.Thereareopportunitieseverywhereinlife. B.Thenextadventureiscomingsoon. C.Peopleneedtomakechangesintheirlife. D.Peopleneedtofollowinherfootstepstoliveontrains. 31.WhatdoestheunderlinedworditinParagraph4referto? A.Theordinarywayoflifeandliving. B.Thethoughtoflivingonatrain. C.GermanTVstationSWR. D.Along﹣distancerelationship.
有各不相同的5红球3黄球2白球事件A从红球和黄球中各选1球事件B从所有球中选取2球则事件A发生是事件B发生的
Nowadaysmoreandpeoplehavechancestotravelstudyworkorevenliveabroad.Itisnecessaryforyoutokeepinmindthesegeneral61ruleforpolitebehavior. Ifyou62invitetoanAmericanfriend'shomefordinnerfirstofallarriveapproximatelyontimebutnotearly.Americansexpectpromptness准时. Whenyou'reinvitedtosomeone'shomeforameal63ispolitetobringasmallgift.Flowersorcandiesarealwaysappropriate.Ifyouhaveanattractiveitem64makeinyournativecountryyourhostorhostesswouldcertainlyenjoyreceivingthatasagift. Wearingproperclothesandabeautifulsmileissimplynotenough.Tablemannersarealsoofgreat65important.Donotopenyourmouthtotalk66youhaveswallowedyourfood.Alsochewfoodwithyourmouth67close.Whenyouwanttogetthefoodthatisatadistancedonotstretchyourhandstoreach68it.Insteadaskforthefoodtobepassedtoyou. Don'tleave69immediateafterdinnerbutdon'toverstayyourwelcomeeither.Whenyourfriendsseemtobegettingtiredandrunningoutofconversationtaketheirbehaviorasasignaltoleave.Thenextdaycallorwrite70thank﹣younotetosayhowmuchyouenjoyedtheevening.
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