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已知集合M={x|-2<x<2},i为虚数单位,a=|1+i|,则下列选项正确的是( )
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高二下学期数学《》真题及答案
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已知U.=R.集合A.={x|x2-x-2=0}B.={x|mx+1=0}B.∩∁U.A.=∅则m=
已知复数1-2ii其中i为虚数单位在复平面内对应的点M.在直线y=mx+n上其中mn>0求+的最小值
已知集合M.={12zi}i为虚数单位N.={34}M.∩N.={4}则复数z=
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已知=1-yi其中xy是实数i是虚数单位则x+yi的共轭复数为
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已知集合M={x|﹣2<x<2}i为虚数单位a=|1+i|则下列选项正确的是
a∈M
{a}∈M
{a}⊄M
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已知集合M.={ii2}i是虚数单位Z.为整数集则集合Z.∩M.中的元素个数是
3个
2个
1个
0个
已知复数z满足z-2i=1+ii为虚数单位则z的模为________.
已知复数z=1+i1-2ii为虚数单位则z的实部为.
已知i为虚数单位a∈R若a-1a+1+i=a2-1+a-1i是纯虚数则a的值为
-1或1
1
3
-1
已知xy∈Ri为虚数单位.若=1-yi则x+yi=
2+i
1+2i
1-2i
2-i
已知集合M.=i是虚数单位Z.为整数集则集合Z.∩M.中的元素个数是
3个
2个
1个
0个
已知xy∈Ri为虚数单位.若=1-yi则x+yi=
2+i
1+2i
1-2i
2-i
设集合M.={y|y=|cos2x-sin2x|x∈R.}N.={x||x-|
(0,1)
(0,1]
[0,1)
[0,1]
已知集合M.=i是虚数单位Z.为整数集则集合Z∩M中的元素个数是
3个
2个
1个
0个
已知集合A={x||x|=2}B={x|mx=﹣1}若B⊆A则m值的集合为.
已知集合
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2
-1)i}(a∈R.,i是虚数单位),若A.⊆R.,则a=( ).A.1
-1
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0
已知集合M.=i是虚数单位Z.为整数集则集合Z.∩M.中的元素个数是
3个
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2
1
0
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-4
4
-1
1
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Food﹣securitychallengeswillnotbemetbysimplyincreasingprimaryproduction.ManymostlypoorpeoplelivingindevelopingcountriesdoneedmorecaJoriesandnutrientsandincreasesinproductionarerequiredtosatisfythisneed.Butasignificantproportionofthesepeoplearebecomingwealthierandiftheconcomitant伴随而来的changesindiettowardstheconsumptionofhigherenergyfoodscontinuethenutritionalstatusofthisrapidlyincreasinggroupwillprobablydiminishevenasitscalorificintakegrows. Thecurrentstatusofglobalnutritionisfarfromsatisfactory.AccordingtotheFoodandAgricultureOrganizationFAOoftheUnitedNations795millionpeoplearehungry.Paradoxically自相矛盾的是atleast2billionpeopleconsumetoomanycaloriesmanyofwhomalsodonotgetenoughnutrients. Thefailuretoconsistentlyrecognizethatitisnotonlypeoplewhoarehungrybutalsothosewhohavetoofewnutrientsandthosewhooverconsumecalorieschallengeseffortstoaddresstheproblemcomprehensively.Itisessentialtoincreasethesupplyoffoodforpeoplewhoarehungry.Therearehowevergrowingconcernsaboutthehealthconsequencesofoverconsumptionparticularlyintheformofemptycalories'fromfoodsthatcontainsolidfatsoraddedsugarsthatsupplyenergybutlittleornoothernutrition. Malnutrition营养不良isrelatedtoconsumptionpatternsofcaJoriesandnutrientsratherthanfoodproduction.Majordeterminantsofconsumptionincludefoodpreferenceallocationculturalnormscookingskillandconvenience.Butai^uablythemostimportantisaffordability.Itistheincreasedavailabilityandaffordabilityofprocessedhigh﹣energyfoodsfortheemergingglobalmiddleclasstoconsumeamore﹣Westerndietthatismakingmalnutritionaglobalproblem. Mostinternationaleffortstoimprovefoodsecurityfocusonlyonhungerandundemutrition.andhencepushtoincreasefoodproduction.Butthisproductionistapproachwillnotsolveallformsofmalnutrition.Moreemphasisshouldbeplacedonchangingconsumptionpatterns.Thiswillnotonlyhelptoidentifytherootcausesofmalnutritionbutalsosendasignaltoproducersaboutthenatureoffoodsneededtoaddressmalnutrition. Evenwithagreateremphasisonconsumptionsolutionswillbefarfromstraightforward.Eachactorinvolvedinthefoodsystem﹣fromprimaryproducertoretailer零售商一hastheirownmotivationsandmodesofinteraction.TomeettheUnitedNations'goalofendingallformsofmalnutritionby2030weneedtothinkaboutthewholefoodsystem.Apurelyproductionistapproachwillnotbesufficient﹣weneedtomanagefooddemandnotjustmeetit. 58.TheunderlinedworddiminishinParagraph1mostprobablymeans. A.change B.weaken C.improve D.maintain 59.Accordingtothepassagewhatproblemwithmalnutritionhasraisedgrowingconcerns? A.Manypeoplearestillsufferingfromstarvation. B.Morepeopleprefertoresistthewesternlifestyle. C.Peoplefailtorealizeitscausesandconsequences. D.Peopleoverconsumecalorieswithpoornutrition. 60.Wecanlearnfromthepassagethataddressingmalnutritionwillrequire. A.themotivationoftheproducers B.changesacrosstheentirefoodsystem C.anincreaseinfoodproductionandsupply D.theimprovementofpeople'slivingstandard 61.Whatisthebesttitileforthepassage? A.Fightagainststarvation B.Cutdownconsumption C.Lookbeyondproduction D.Polishupsecurity.
某同学欲测定一节干电池的电动势和内阻已知选用的实验仪器如下 电压表V0.3V.Rv=10kΩ 电流表A0﹣0.6ARA=0.5Ω 滑动变阻器R0~500Ω2A 开关S导线若干 1为了准确地测量干电池的电动势和内阻实验电路图应选择如图1所示. 2闭合开关改变滑动变阻器电阻进行测量读出电压表和电流表的读数画出对应的U﹣I图线如图2所示由图线可得该电池的电动势E=V内阻r=Ω.结果保留两位小数.
如图所示光滑水平面上存在有界匀强磁场边界为MN和PQ磁场方向直水平面向里边长为L的正方形导线框以一定的初速度在水平面上穿过有界磁场有界磁场的宽度d大于正方形线框的边长L下列说法正确的是
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EP 2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Q 3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
某同学利用如图甲所示的电路测定电源的电动势和内电阻实验中电表内阻对实验结果的影响很小均可以忽略不计.闭合电键S后变阻器的滑动触头P由变阻器的一端滑到另一端的过程中两电压表示数随电流变化情况分别如图乙中的直线ab所示. 1将如图丙所示实物图中未连接的部分元件按电路图连接成实验电路 2通过分析可知图乙中直线填a或b表示电压表V1示数随电流表A示数变化的关系 3根据U﹣I图象中坐标轴表示的数据可求出电源电动势E=内电阻r=.
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OneafternoonIarrangedmynotesonthepodium讲台andbeganmylecture.1noticedthatwhatIwassayingwasnot36myoutline.IkeptstrugglingtogetbacktomyoutlineforthetalkbutafterafewminutesIrealizedthetalkIhadnot37wasbetterthantheoneIhad.SoIjustletthe38flowoutofmeforthenexttwohours.Atthe39ofmypresentationawomanapproachedmeandsaidI've40youbefore.Thistalkisbetterthanusual.Thenextwoman41andsaidSeeminglystandinginfrontofyoufortheentiretalkwasthisman.I42hispictureforyou.WhenIlookedatthepictureIknew43itwas. GeorgeismyinnerguidewhomImetwhendoingguidedimagery意向符号asanonbelieverforthefirsttime.FromthatdayforwardGeorgedoesaJimy44forme.Theycomefromakindofconsciousness45withtheaudience. Ihavebeeninfourlife﹣threatening46.includingchokingnearlytodeathcarcollisionsand47theroofwhentheladderbrokeEachtimeIwalkedawaywithnoserious48.IsaidtoanaudienceonsnightImusthavean49. Ibelieveweallhaveangelsorguides.Ican'thelpbutSOthestoryoftheladywhohearsavoicesayJumpback.She51andrealizesshewouldhavebeenhitbyabusifshekeptcrossingthestreet.It'sagoodthingshe52! Wemustrememberthatthereisalways53inlife.Wearecapableof54thingsandwhenwedonotfearfailurewchavenothingto55byattemptingtoachievethemiraculous奇迹般的. 36.A.revising B.following C.drawing D.providing 37.A.planned B.attended C.missed D.hosted 38.A.anger B.water C.words D.moods 39.A.beginning B.expense C.point D.conclusion 40.A.called B.consulted C.admired D.heard 41.A.cameup Bwavedoff C.lookedaway D.burstout 42.A.printed B.drew C.described D.bought 43.A.what B.why C.how D.who 44.A.talks B.writings C.suggestions D.drawings 45.A.replaced B.discussed C.shared D.compared 46.A.accidents B.occupations C.coincidences D.experiments 47.A.jumpingover B.fallingoff C.breakinginto D.gettingonto 48.A.diseases B.barriers C.mistakes D.injuries 49.A.angel B.mystery C.devil D.soul 50.A.adapt B.remember C.write D.explain 51.A.hesitates B.wakes C.fears D.obeys 52.A.stopped B.listened C.helped D.delayed 53.A.harmony B.success C.knowledge D.wonder 54.A.struggling B.amazing C.inspiring D.disgusting 55.A.ignore B.get C.lose D.forget
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Gamblers赌徒atMonteCarloarepursuingmoneyandmostofthemloseitinsteadbutthereareotherwaysofpursuingmoneywhichoftensucceed.Soitiswithhappiness.EpicurusaGreekphilosopherpursueditbylivingonlyinpleasantsocietyandeatingonlydrybreadforthesakeofhispoorhealthwithalittlecheeseonfeastdays.Hismethodprovedsuccessfulinhiscasebutsomethingmorenutritiouswouldbeneededformostpeopleforwhomthepursuitofhappinessunlesssupplemented补充invariouswaysistooabstractandtheoreticaltobeadequateasapersonalruleoflife. Weimagineourselvesmoredifferentfromtheanimalsthanweare.Animalsliveonimpulse冲动andarehappyaslongasexternalconditionsarefavorable.Acatwillenjoylifeifithasfoodandwarmthandopportunitiesforanoccasionalnightontheroof.Yourneedsaremorecomplexthanthoseofacatbuttheystillhavetheirbasisrelatedtonature.IncivilizedsocietiesespeciallyinEnglish﹣speakingsocietiesthisistoolikelytobeforgotten.Peopleproposetothemselvessometopmostobjectiveandpreventallimpulsesthatdonotseemtoserveit.Abusinessmanmaybesoanxioustogrowrichthathesacrificeshealthandprivateaffections.Whenatlasthehasbecomerichnopleasureremainstohimexceptannoyingotherpeoplebyinspirationstoimitatehisnobleexample.Manyrichladiesalthoughnaturehasnotqualifiedthemwithanyspontaneous自发的pleasureinliteratureorartdecidetobethoughtculturedandspendboringhourslearningtherightthingtosayaboutfashionablenewbooksthatarewrittentogivedelightnottoaffordopportunitiesfordustysnobbism势利. Ifyoulookaroundatthemenandwomenwhomyoucancallhappyyouwillseethattheyallhavecertainthingsincommon.Themostimportantofthesethingsisanactivitywhichatmostgraduallybuildsupsomethingthatyouaregladtoseecomingintoexistence.Womenwhotakeaninstinctivepleasureintheirchildrencangetthiskindofsatisfactionoutofbringingupafamily.Artistsandauthorsandmenofsciencegethappinessinthiswayiftheirownworkseemsgoodtothem.Alsomanymendevotetheirweekendstovoluntaryandunpaidlaboiintheirgardensandwhenthespringcomestheyexperienceallthejoysofhavingcreatedbeauty. Thewholesubjectofhappinesshasinmyopinionbeentreatedtooseriously.Ithadbeenthoughtthatmancannotbehappywithoutatheoryoflifeorareligion.Perhapsthosewhohavebeenledtounhappinessbyabadtheorymayneedabettertheorytohelpthemtorecoveryjustasyoumayneedatonic补药whenyouhavebeenill.Butwhenthingsarenormalamanshouldbehealthywithoutatonic.Itisthesimplethingsthatreallymatter.Ifamandelightsinhiswifeandchildrenhassuccessinworkandfindspleasureinthealternationofdayandnightspringandautumnhewillbehappywhateverhisphilosophymaybe.Ifontheotherhandhefindshiswifefiatetlilhischildren'snoiseunbearableandtheofficeanightmareifinthedaytimehelongsfornightandatnightsighsforthelightofdaythenwhatheneedsisnotanewphilosophybutanewlifestyle一adifferentdietormoreexerciseorwhatnot. Manisananimalandhishappinessdependsonhisphysiology生理morethanhelikestothink.Thisisasimpleconclusionbut1cannotmakemyselfdisbelieveit.Unhappybusinessmen1amconvincedwouldincreasetheirhappinessmorebywalkingsixmileseverydaythanbyanyimaginablechangeofphilosophy. 66.WhatdoestheauthorthinkofEpicurus'wayofpursuinghappiness? A.Itdeserveswiderecognition. B.Ithelpsgamblerspursuemoney. C.Itissuitableforafewindividuals. D.Itisadequateasapersonalruleoflife. 67.Fromthepassagewecanlearn. A.humanscanfindpleasurewithoutthinkingtoomuch B.animalstendtobecontentwithbasicrequirements C.animalsliveinharmonywithnaturelikehumans D.humansshouldlearntoavoidhighexpectations 68.Thebusinessmanmentionedinthepassage. A.succeedsininspiringpeoplearoundhim B.attacheslittleimportancetohislifegoal C.makeseffortstomeetbasicrequirements D.endsupwithwealthbutlittlehappiness 69.Accordingtothepassagewhatdohappypeoplehaveincommon? A.Theyaregoodatreadingsomefashionablenewbooks. B.Theyexpectbothfamilyhappinessandcareersuccess. C.Theypossessthespiritofsacrificewithoutanyreward. D.Theygetsatisfactionfromtheirworthwhileactivities. 70.What'stheauthor'sopinionoflifephilosophy? A.Philosophyshouldn'tbestressedtoomuchinourlife. B.Philosophyplaysamoreimportantrolethanlifestyle. C.Philosophywilldeterminehowhappypeoplefeel. D.Philosophyisgenerallybasedonone'sphysiology.
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ReadingalotwhenyoungmakesJackheisatpresent. A.where B.when C.why D.how
设i为虚数单位则x+i6的展开式中含x4的项为
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高二下学期数学
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理
高三上学期生物
高三上学期化学
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库