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高三下学期数学《》真题及答案
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已知复数z的虚部为在复平面内复数z对应的向量的模为2求复数z.
实数m分别取什么数值时复数z＝m2＋5m＋6＋m2－2m－15i1与复数2－12i相等2与复数12＋
复数z=1+i为z的共轭复数则．
复数的共轭复数是
按要求写出相应的词1.this反义词________2.these反义词________3.it复数
复数其中i是虚数单位则复数z的共轭复数为
复数的共轭复数是___
与正弦量具有一一对应关系的复数电压复数电流称之为
怎样用复数表示正弦量为什么要用复数表示
复数z满足z1﹣i=|1+i|则复数z的共轭复数在复平面内的对应点位于
第一象限
第二象限
第三象限
第四象限
如果一个复数的实部和虚部相等则称这个复数为等部复数若复数Z=1+aii为等部复数则实数a的值为
﹣1
0
1
2
[说明]编写一个完整的JavaApplet程序使用复数类Complex验证两个复数1+2i和3+4i
数据压缩编码方法可以分为无损压缩和有损压缩其中无损压缩编码的特点是.
有失真恢复数据、压缩比高
无失真恢复数据、压缩比高
有失真恢复数据、压缩比低
无失真恢复数据、压缩比低
复数3i-1的共轭复数是
已知复数z1＝3－iz2是复数－1＋2i的共轭复数则复数－的虚部等于________.
定义若z2＝a＋biab∈R.i为虚数单位则称复数z是复数a＋bi的平方根.根据定义则复数－3＋4i
设复数z满足z1＋i＝2＋4i其中i为虚数单位则复数z的共轭复数为__________.
下列命题正确的是________.填序号①复数的模总是正实数②虚轴上的点与纯虚数一一对应③相等的向量
设复数z=2+i则复数z1﹣z的共轭复数为
﹣1﹣3i
﹣1+3i
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组成染色体和染色质的主要物质是
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Robotsarenowbeingemployednotjustfordangeroustaskssuchasdiscoveringminesorrescuingpeopleindisasters.Theyarealsofindingapplicationashouseholdhelpsandasnursingassistants.Asincreasingnumbersofmachinesequippedwiththelatestartificialintelligencetakeonagrowingvarietyofspecializedandeverydaytasksthequestionofhowpeopleseethemandbehavetowardsthembecomesevermoreurgent. AteamledbySariNijssenofRadboudUniversityandMarkusPaulusProfessorofDevelopmentalPsychologyatLudwig﹣Maximilians﹣UniversitaetLMUhavecarriedoutastudytodeterminethedegreetowhichpeopleshowconcernforrobotsandbehavetowardsthembasedonmoralprinciples. AccordingtoSariNijssenthestudysetouttoanswerthefollowingquestionUnderwhatcircumstanceswouldadultsbewillingtosacrificerobotstosavehumanlives?Theparticipantswerefacedwithahypothetical假设的moraldilemmaWouldtheybepreparedtoputasinglepersonatriskinordertosaveagroupofinjuredpersons?Inthesituationspresentedtheintendedvictimwaseitherahumanahumanoidrobotthathadbeenhumanized人性化的tovariousdegreesorarobotthatwasclearlyrecognizableasamachine. Thestudysuggestedthatthemoretherobotwashumanizedthelesslikelyparticipantsweretosacrificeit.Situationsthatincludedvividstoriesinwhichtherobotwasdescribedasamercifulbeingorasacreaturewithitsownunderstandingsexperiencesandthou^itsweremorelikelytostopthestudyparticipantsfromsacrificingitintheinterestsofanonymous无名的humans. ThisresultindicatesthatourstudygroupattachedacertainmoralstatustotherobotsaysPau﹣lus.Onepossiblesuggestionofthisfindingisthatattemptstohumanizerobotsshouldnotgotoofar.Sucheffortscouldcomeintoconflictwiththeirintendedfunction﹣tobeofhelptous. 1Whathasbecomeaconcernaboutrobots? A.Howtohumanizethem. B.Howtotreattheminlife. C.Howtousethemeffectively. D.Howtofindmoreapplications. 2Inthestudytheparticipantsprobablyhavetodecide. A.whentosacrificearobot B.wheretoexperiencerisks C.whichrobottoworkwith D.whatrobotsshouldbelike 3WhatcanbeinferredfromPaulus'words? A.Humanizedrobotsofferlesshelptopeople. B.Humanizingrobotstoomuchmaybeimproper. C.Certainmoralstatusshouldbeattachedtorobots. D.Conflictsoftenhappenbetweenhumansandrobots. 4Whichofthefollowingwouldbethebesttitleforthetext? A.RobotsAMustforFuture B.HumanizedRobotsANewTrend C.RobotSavedPeopleTaketheHit D.HumanizedRobotsReplaceHuman
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Inacleanclinicalroommybestfriendwasdyinginmyarms.Hiseyesdarkbrownandtrustingwouldsoon1forever.HeartbrokenIsaidFlashyou2somuchhappinesstome.Iwilldosomethinggoodasa3. Flashcameintomy4whenIwasnine.Fromthemomentrayparentsbroughtthiscutedoghomehe5myfamilywithjoy. Then6happened.MymumwasdiagnosedwithbreastcancerwhenIwas11.Thenmygrandmawhowasmy7passedaway.MysisterdevelopedCrohn'sDiseaseandwhilebeingtested8aheartattack.Iwasbeingbulliedatschoolandstartedto9classesandavoidseeingpeople. Flashsoongaveroeallthe10hecouldoffer.ThereweretimeswhenIfelttherewasno11butapairofbrowneyesandlovingfacewouldsomehowcaseme.Iknewhewas12thereforme.Iknewheunderstood. Nowafter15yearsFlashwas13.Ithoughtdoingcharityworkwasthebestrewardforhim.I14inanon﹣profitorganizationinSouthamptonandcontributedabout3500hoursto15hildrenwithspecialneedswhichcompletelychangedmylife.Ilearnedtolovethe16Ihadbeenonandevenacceptthe17bits. IstillmissFlash.Itwashimthathadsomehow18metohelpingothers.Flash'sdeathwasoneofthe19momentsofmylife.Butitalsoaninspiringmomentthat20whoIwas﹣inthebestpossibleway﹣forever. 1A.open B.close C.shine D.fade 2A.brought B.told C.saved D.owed 3A.relief B.chance C.bonus D.reward 4A.mind B.room C.world D.power 5A.helped B.filled C.protected D.decorated 6A.disasters B.stories C.wonders D.mistakes 7A.burden B.trouble C.strength D.challenge 8A.caused B.noticed C.fought D.suffered 9A.skip B.give C.take D.enjoy 10A.comment B.comfort C.expectation D.relaxation 11A.hope B.time C.money D.use 12A.frequently B.sometimes C.hardly D.always 13A.aging B.gone C.missing D.deserted 14A.searched B.competed C.volunteered D.performed 15A.attendingto B.meetingwith C.talkingabout D.bringingup 16A.earth B.journey C.holiday D.street 17A.fantastic B.absurd C.hard D.pleasant 18A.led B.forced C.trained D.persuaded 19A.fullest B.craziest C.tiniest D.saddest 20A.explained B.transformed C.admitted D.described
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在动物细胞有丝分裂过程中需要进行复制的结构是
研究者将空腹的大鼠置于冷水中探究冷水刺激对大鼠生理功能的影响． 1冷水刺激引起实验大鼠皮肤产生兴奋兴奋沿传入神经到达神经中枢经神经中枢处理使传出神经末梢释放引起皮肤血管减少皮肤散热量同时引起填激素名称分泌增加细胞代谢加快产热量增加以维持体温稳定． 2冷水刺激产生的兴奋还可以通过神经中枢作用于胰岛引起分泌增加该激素促进分解血糖水平升高以对抗冷水刺激． 3胃黏膜可抵御致病微生物对机体的侵害在机体填“特异性“或”非特异性“免疫中发挥重要作用．
如图所示的电路中闭合开关S电路正常工作发现两只电压表的指针偏转角度相同其中两表均为0～3V和0～15V的双量程电压表则R1R2等于
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番茄果实的颜色由一对等位基因Aa控制着表是关于番茄果实颜色的3个杂交实验及其结果．请分析回答 1番茄的果色中是显性性状这一结论是依据实验得出． 2写出3个实验中两个亲本的基因型． 实验一实验二实验三． 3如果让第一组中的红果与第二组中的红果杂交子代的表现型为基因型为．
WhenIfirstcametoUKfromChinaat6Ienteredthefirstgrade.1.Isawchildrenthrowtheirleftoverfoodintothelargetrashcans﹣fromhalf﹣eatenpizzastountouchedburgers.Iwatchedthempourtheirmilkintoawhitebucket.InChinathiswasahugeno﹣noinschool.Wehadtofinisheverything. Onedaymyfirstgradeteacherannouncedthatwewouldbehavingapartyandeveryonewastoldtobringsomethingfromtheircountry.2.Mymomstayedupafterherlongdayofworkandmademanydumplings.SheputtheminthefridgeandwokeupearlyinthemorningtosteamthemandfrythemsotheywouldtasteextrafreshwhenIbroughtthemtoschool.Theysmelledgreatandlookedgoldenbrownaftertheywerecooked. Iwassoexcitedtosharethesewithmyclassandteachers.Itwasplacedinthecornerofthetablenexttoalltheotherdeliciousfood.3.OneortwokidsbravelytookapieceandknewwhattheywerebecausetheyhaditwiththeirparentsataChineserestaurant.Attheendofthepartyitwascleanup.MyteacherwalkeduptomeandaskedpointingtothedumplingsWouldyouliketotakethesehome?IcarefullyrepliedNo…4.IthoughtshewasgoingtoshareitwithotherteachersbutimmediatelyafterIsaidthatshethrewallthedumplingsintothetrashandcontinuedcleaning.Iwasconfused;whatjusthappened? 5.AndtodayIstillwitnessthisfrequentlyinmyEnglishfiends.Pleaseeatallyourfoodortakeittogoorshareitorjustgetenoughsoyoudon'thavetothrowitaway.Thankyou. A.InChinanousuallymeansyes B.Igotsuperexcitedandtoldmyparents C.Itwasveryimpolitetotakeyourgifthome D.ThiswasthebiggestcultureshockIhaveexperienced E.WhenIgothomeIsharedtheexperiencewithmyparents F.Manykidshadthecookiesandjuicesandwerehesitanttotrythedumplings G.Ididn'tunderstandwhykidsweregettingtheirlunchfoodandnotfinishingit
Aroundtheworldmalnutrition营养不良hasbecomeaproblemthatcosts﹩3.5trillionperyearaccordingtothelatestGlobalNutritionReport1givesananalysisoffoodandnutritionissueseachyear. Althoughmostcountrieshavefallenshortintheirefforts2dealwithpoornutritionandfoodinsecuritytheUSappearstobebadlyofftrackthereportfound.Theworld's3largeeconomycontinuestosufferfromhighratesofobesitydiabetesandanemia贫血accordingtothedataandhasmorethanamillionoverweightchildren. Malnutritionisresponsibleformoreill﹣health4anyothercause.5healthconsequencesofoverweightandobesitycontributetofourmilliondeaths6globe.CorinnaHawkesdirectoroftheCenterforFoodPolicy7writeinthereport. Accordingtothestudymostcountrieshaveatleasttwoissuesrelatedtomalnutrition.Themostseriousissuesarechildrenwhoareeitheroverweightanemic8sufferfromundevelopedgrowth.Overallmalnutritioncontributestoabouthalfofallchildhooddeathstheresearchshowed.Andthose9affectmaynotbeabletogetasgoodajobastheycouldhaveiftheyhadbeenfedwell.Italsopreventsthem10beabletocontributetosocietyandtheeconomyaswellastheywouldhaveinahealthierenvironment.
假设你是李华你的英国笔友Tony即将完成学业上周他来信就是否到中国工作询问你的意见.请根据以下提示回一封电子邮件内容包括 1建议他来中国就业; 2阐述你的理由就业机会多专业受欢迎不同的文化体验等; 3承诺可以提供帮助. 注意1词数100左右开头和结尾已给出不计入总词数; 2可适当增加细节以使行文连贯. DearTony Yours LiHua
下列对酶的叙述中正确的是
小郑同学利用手边的器材天平和砝码空玻璃瓶足够的水某种液体顺利的完成了测量“某种液体密度”的实验．下面给出的是小郑完成实验时的第一个步骤请你将实验步骤补充完整．已知水的密度为ρ水待测液体足够多 1用调节好的天平和砝码测出空玻璃瓶的质量m0并记录在表格中 2用调节好的托盘天平测量并记录在表格中 3用调节好的托盘天平测量并记录在表格中 液体密度的计算公式ρ液＝．
顶端优势现象产生的原因是
如图是标准大气压下质量为1g的某液体的体积﹣﹣温度图以下说法正确的是
我们可以用图示的电路图测量未知电阻RX的阻值．调节电路当电压表示数U为3.0V时电流表的示数为0.3A．如果考虑到电流表的电阻值RA为0.5Ω待测电阻RX′的阻值应为Ω．
手和脚有时会磨出“水泡”．“水泡”中的液体主要是
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