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若不等式在t∈（0，2]上恒成立，则实数a的取值范围是 ．
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高三上学期数学《》真题及答案
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若不等式在t∈02]上恒成立则实数a的取值范围是．
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已知关于x的不等式x2-ax+2a>0在R.上恒成立则实数a的取值范围是.
若关于的不等式在0+上恒成立则实数的取值范围是.
若不等式在t∈02]上恒成立则实数a的取值范围是．
若不等式2xlnx≥－x2＋ax－3对x∈0＋∞恒成立则实数a的取值范围是
(－∞，0)
(0，＋∞)
(－∞，4]
[4，＋∞)
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若不等式在条件a>b>c时恒成立则实数λ的取值范围是________.
在R.上定义运算△x△y=x1一y若不等式x—a△x+a
若不等式上恒成立则实数a的取值范围为_
若不等式在t∈02]上恒成立则实数a的取值范围是．
若不等式在t∈02]上恒成立则实数a的取值范围是．
若不等式a-2x2+2a-2x-4
已知函数fx＝x＋2|x－2|.1若不等式fx≤a在[－31]上恒成立求实数a的取值范围2解不等式f
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10分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处语言错误每句中最多有两处.每处错误仅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Λ并在其下面写出该加的词. 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. Amostinterestingthinghappenedtomelastwinter.DuringmywintervocationIspendmyluckymoneyonagiftforGrandma.OneFridayafternoonIwenttoacellphonestoreandchosealargerbuttonphonespecialdesignedforseniors.IgavethemtomygrandmawhenIcametovisitherattheweekend.UponreceivethephoneGrandmawasveryhappyandeagerlearnhowtouseit.Ihadpatientlyexplainedalltheimportantfunctionssheneeded.Grandmalearnedcarefullybutwantedtohaveatrystraightaway.Undermyhelpshesuccessfullycalledhergoodfriend.ThatafternoonGrandmaproudlytoldtheneighborthatshecouldmakecallswiththenewphoneIboughther.TheyallpraisedwhatthoughtfulIwas.
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8分RecentlytheTVshow'WherearewegoingDad?'producedbyHunanSatelliteTelevisionisabighitacrossnation.Manyfamousstarsbroughttheirchildrentoastrangevillagealoneandtheyhadtospend72hourswiththeirchildrenthere.Theprogramfullyshowedusamodernversionofthe'howtobeagoodfather'.Astheyoungparentstodayaretoobusytotakecareoftheirchildrenthisnewformof'Lostontheway'playedbynannyDaddyandcutekidstriggered触发alotofpeople'semotionalresonance共鸣.Boththekidsandtheirparentswillfindthattheirheartsarebeingdrawncloser.Butthiskindoffeelinghasjustprovedthatthereisabigspiritualbarrierbetweenthemodernparentsandchildren.TheTVshowslike'Childrenarehardtosupport!''WherearewegoingDad?''hotmom'and'cutekids'arebecomingmoreandmorepopular.Alloftheseshowthenewparents'confusioninchildren'seducationandtheappealforthebalancebetweencareerandfamily.Inthereallifeontheonehandtheyoungparentsfeelhelplessbecausetheyaretoobusytoaccompanytheirchildrenunderthepressuresofworkandlifeontheotherhandtheycontinuetodoso.ThedatacollectedbyHNTVshowsthatnearlytwo﹣thirdsoftheiraudiencearefemaleamongwhom36%areagedfrom25to34.Wecanimaginesuchascenethatoneeveningayoungmotheriswatchingtheshowwithheryoungchildrenwhileherhusbandisstillatworkortrappedinsocializingormaybeisjustplayingcomputergamesinthebedroom.Thestoryofachildwithoutthecompanyoffatherisstillgoingon.Infactitissometimesthesametomothers.Inamodernfamilyitisoftentheoldwhotaketheresponsibilityofraisingachild.Theparticipationofmotherinthechildren'seducationisalsoverylow.Itisjustthiskindofconfusionwheretheparentshavegoneinthemodernfamilyeducationandwheretheparentswillguidetheirchildrentogothat'WherearewegoingDad?'showsus.Ifachildwantstogrowuphealthilyandsafelyintoamoderncitizenwithindependentpersonalityandfreespirititisveryimportantforhimorhertofollowtheparentswhoserveastheirfirstteacher.MaybethisistherealreasonwhysuchkindofTVprogramscouldgethot.Thetruthisthatchildrenwillgowheretheirparentsgoandsocietywillgowherethechildrengo.1Toraiseachildinmodernsocietyparentsshould.A.breakdownthebarrierbetweenchildrenandteachersB.balancewellbetweenfamilyandcareerC.playcomputergameswiththeirchildrenD.keeptheirchildrenathometoavoidsocializing2Whatdoestheunderlinedword'participation'probablymean?A.takingresponsibilityB.understandingC.takingpartD.keepingcompany3Whatattitudetowardsmodernfamilyeducationdoestheauthorexpressinthesecondparagraph?A.Optimistic.B.Indifferent.C.Proud.D.Worried.4Whichoneisthebesttitleofthepassage?A.NewproblemsinModernChildren'sEducationB.ModernEducationisImportantC.ConfusionBehind'Wherearewegoingdad?'D.NannyDaddyandCuteKids
AnewcollectionofphotosbringsanunsuccessfulAntarcticvoyagebacktolife.FrankHurley'spictureswouldbeoutstanding﹣﹣﹣﹣undoubtedlyfirst﹣ratephoto﹣journalism﹣﹣﹣iftheyhadbeenmadelastweek.Infacttheywereshotfrom1914through1916mostofthemafteradisastrousshipwreck海难byacameramanwhohadnoreasonableexpectationofsurvival.Manyoftheimageswerestoredinanicechestunderfreezingwaterinthedamagedwoodenship.TheshipwastheEnduranceasmalltightNorwegian﹣builtthree﹣masterthatwasintendedtotakeSirErnestShackletonandasmallcrewofseamenandscientists27meninalltothesouthernmostshoreofAntarctica'sWeddellSea.FromthatpointShackletonwantedtoforceapassagebydogsled雪橇acrossthecontinent.ThejourneywasintendedtoachievemorethanwhatCaptainRobertFalconScotthaddone.CaptainScotthadreachedtheSouthPoleearlyin1912buthaddiedwithhisfourcompanionsonthemarchback.AswriterCarolineAlexandermakesclearinherforcefulandwell﹣researchedstoryTheEnduranceadventuringwaseventhenathoroughlycommercialeffort.Scott'slastjourneycompletedasbelayinatentdyingofcoldandhungercaughttheworld'simaginationandafilmmadeinhishonordrewcrowds.ShackletonaonetimeBritishmerchant﹣navyofficerwhohadgottowithin100milesoftheSouthPolein1908startedabusinessbeforehis1914voyagetomakemoneyfrommovieandstillphotography.FrankHurleyaconfidentandgiftedAustralianphotographerwhoknewtheAntarcticwashiredtomaketheimagesmostofwhichhaveneverbeforebeenpublished.33.WhatdoweknowaboutthephotostakenbyHurley?A.TheyweremadelastweekB.TheyshowedunderseasceneriesC.TheywerefoundbyacameramanD.Theyrecordedadisastrousadventure34.WhoreachedtheSouthPolefirstaccordingtothetext?A.FrankHurleyB.ErnestShackletonC.RobertFalconScottD.CarolineAlexander35.WhatdoesAlexanderthinkwasthepurposeofthe1914voyage?A.ArtisticcreationB.ScientificresearchC.MoneymakingD.Treasurehunting.
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Agardenthat'sjustrightforyouHaveyouevervisitedagardenthatseemedjustrightforyouwheretheatmosphereofthegardenappearedtototalmorethanthesum总和ofitsparts?36.Butitdoesn'thappenbyaccident.Itstartswithlookinginsideyourselfandunderstandingwhoyouarewithrespecttothenaturalworldandhowyouapproachthegardeningprocess.●37Somepeoplemaythinkthatagardenisnomorethanplantsflowerspatternsandmassesofcolor.Othersareconcernedaboutusinggardeningmethodsthatrequirelesswaterandfewerfertilizers肥料.38.Howeverthereareanumberofotherreasonsthatmightexplainwhyyouwanttogarden.Oneofthemcomesfromourearliestyears.●Recall回忆yourchildhoodmemoriesOurmodelofwhatagardenshouldbeoftengoesbacktochildhood.Grandma'srosegardenandDad'svegetablegardenmightbegoodorbadbutthat'snotwhat'simportant.39﹣﹣howbeinginthosegardensmadeusfeel.Ifyou'dliketobuildapowerfulbondwithyourgardenstartbytakingsometimetorecallthegardensofyouryouth.40thengooutsideandworkoutaplantotranslateyourchildhoodmemoriesintoyourgrown﹣upgarden.Havefun.A.KnowwhyyougardenB.FindagoodplaceforyourowngardenC.It'sourexperienceofthegardenthatmattersD.It'sdelightfultoseesomanybeautifulflowersE.StillothersmaysimplyenjoybeingoutdoorsandclosetoplantsF.YoucanproducethatkindofmagicalqualityinyourowngardentooG.Foreachofthosegardenswriterdownthestrongestmemoryyouhave.
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取胆矾CuSO4•5H2O和铁粉组成的混和物放入足量水中充分反应后过滤洗涤干燥得到固体称量其质量比原混和物的质量减轻48.4g另取同质量的原混和物放入水中充分反应后再加入足量的稀硫酸充分作用后过滤将滤液蒸干得到FeSO4•7H2O晶体称其质量比原混和物的质量增加16.6g．则混合物中胆矾和铁粉的物质的量之比为
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8分•Putsunscreen防晒油onbeforegoingoutinthesun.•Takeitwithyou.•Useit﹣afteraswim.﹣everyhourorsowhileplayingoutdoors.﹣ifyougetsweaty.•Coverupwhenthesunisoverhead﹣10a.m.﹣2p.m..﹣especiallyatlunchtime.•Getyoursuntan晒黑graduallyandnottoomuch.•Controlledexposure暴露tosunshinehelpsavoidskincancer.Askyourchemisttorecommendasuitablesunscreen.QueenslandCancerFundP.O.BoxSpringHillQLD.4000Phone078397077ProvidedforcommunityawarenessbytheQueenslandCancer1Thispassageismostlikelytobe.A.anarticlefromastudenttextbookB.adirectionfromabottleofmedicineC.asuggestionfromachemistD.anadvertisementfromanewspaper2WhichstatementisTRUE?A.Youshouldfrequentlyputonsunscreenwhileplayingoutdoors.B.You'llneverhaveskincancerwithcontrolledexposure.C.Youmustn'tstayoutsidefrom10a.m.to2p.m.D.Themoreyougetsunshinethebetteryourhealthwillbe.3AccordingtothepassagewecanseethatQueenslandCancerFundwantsto_.A.sellsunscreenshirtandhatB.helppeopleguardagainstskincancerC.encouragepeopletoplayinthesunD.makemoneyoutofsunscreen4Ifyouwantasunscreenyoushouldaskforadvice.A.thesellerB.theadvertiserC.yourdoctorD.yourparents
G是一种新型香料的主要成分之一其结构中含有三个六元环．G的合成路线如下部分产物和部分反应条件略去已知①RCH＝CH2+CH2＝CHR′CH2＝CH2+RCH＝CHR′②B中核磁共振氢谱图显示分子中有6种不同环境的氢原子③D和F是同系物．请回答下列问题1CH32C＝CH2的系统命名法名称为．2A→B反应过程中涉及的反应类型依次为．3D分子中含有的含氧官能团名称是G的结构简式为．4生成E的化学方程式为．5同时满足下列条件①与FeCl3溶液发生显色反应②苯环上有两个取代基含C＝O的F的同分异构体有种不包括立体异构其中核磁共振氢谱为4组峰能水解的物质的结构简式为．6模仿由苯乙烯合成F的方法写出由丙烯制取α﹣羟基丙酸的合成线路．
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FiveyearsagowhenItaughtartataschoolinSeattleIusedTinkertoysasatestatthebeginningofatermtofindoutsomethingaboutmystudents.IputasmallsetofTinkertoysinfrontofeachstudentandsaid'MakesomethingoutoftheTinkertoys.Youhave45minutestoday﹣and45minuteseachdayfortherestoftheweek.'Afewstudentshesitatedtostart.Theywaitedtoseetherestoftheclasswoulddo.Severalotherscheckedtheinstructionsandmadesomethingaccordingtooneofthemodelplansprovided.Anothergroupbuiltsomethingoutoftheirownimaginations.OnceIhadaboywhoworkedexperimentallywithTinkertoysinhisfreetime.Hisconstructionsfilledashelfintheartclassroomandagoodpartofhisbedroomathome.Iwasdelightedatthepresenceofsuchastudent.Herewasanexceptionallycreativemindatwork.HispresencemeantthatIhadanunexpectedteachingassistantinclasswhosecreativitywouldinfect感染otherstudents.Encouragingthiskindofthinkinghasadownside.Irantheriskoflosingthosestudentswhohadadifferentstyleofthinking.Withoutfailonewoulddeclare'ButI'mjustnotcreative.''Doyoudreamatnightwhenyou'reasleep?''Ohsure.''Sotellmeoneofyourmostinterestingdreams.'Thestudentwouldtellsomethingwildlyimaginative.Flyingintheskyorinatimemachineorgrowingthreeheads.'That'sprettycreative.Whodoesthatforyou?''Nobody.Idoit.''Really﹣atnightwhenyou'reasleep?''Sure.''Trydoingitinthedaytimeinclassokay?'25.TheteacherusedTinkertoysinclassinorderto?A.knowmoreaboutthestudentsB.makethelessonsmoreexcitingC.raisethestudents'interestinartD.teachthestudentsabouttoydesign26.WhatdoweknowabouttheboymentionedinParagraph3?A.Helikedtohelphisteacher.B.Hepreferredtostudyalone.C.Hewasactiveinclass.D.Hewasimaginative.27.Whatdoestheunderlinedword'downside'inParagraph4probablymean?A.Mistake.B.Drawback.C.Difficulty.D.Burden.28.Whydidtheteacheraskthestudentstotalkabouttheirdreams?A.Tohelpthemtoseetheircreativity.B.Tofindoutabouttheirsleepinghabits.C.Tohelpthemtoimprovetheirmemory.D.Tofindoutabouttheirwaysofthinking.
2014年诺贝尔化学奖授予超高分辨率荧光显微镜的贡献者．人类借助于这种显微镜可以观察到单个的蛋白质分子．下列有关叙述不正确是
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括 1.主题环境保护 2.展览时间 3.投稿邮箱intlphotoshow@gmschool.com. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
What'sOn?ElectricUnderground7.30pm﹣1.00amFreeattheCyclopsTheatreDoyouknowwho'splayinginyourarea?We'rebringingyouaneveningofliverockandpopmusicfromthebestlocalbands.Areyouinterestedinbecomingamusicianandgettingarecordingcontract合同?Ifsocomeearlytothetalkat7.30pmbyJulesSkyeasuccessfulrecordproducer.He'sgoingtotalkabouthowyoucanfindtherightpersontoproduceyoumusic.GeeWhizz8.30pm﹣10.30pmComedyatKaleidoscopeComeandseeGeeWhizzperform.He'sthefunnieststand﹣upcomedianonthecomedyscene.Thisjoyfulshowwillpleaseeveryonefromtheyoungesttotheoldest.GeeWhizzreallyknowshowtomakeyoulaugh!Ourbarisopenfrom7.00pmfordrinksandsnacks快餐.Simon'sWorkshop5.00pm﹣7.30pmWednesdaysatVictoriaStageThisisagoodchanceforanyonewhowantstolearnhowtodocomedy.Theworkshoplooksateverykindofcomedyandpracticesmanydifferentwaysofmakingpeoplelaugh.Simonisacomedianandactorwhohas10years'experienceofteachingcomedy.Hisworkshopsareexcitingandfun.AneveningwithSimonwillgiveyoutheconfidencetobefunny.CharlotteStone8.00pm﹣11.00pmPizzaWorldFinefoodwithbeautifuljazzmusicthisisagreateveningout.CharlotteStonewillperformsongsfromhernewbest﹣sellingCDwithJamesPickeringonthepiano.ThemenuisItalianwithexcellentmeatandfreshfishpizzasandpasta面食.Bookearlytogetatable.Ourbarisopenalldayandservescocktailscoffeebeerandwhitewine.21.Whocanhelpyouifyouwanttohaveyourmusicproduced?A.JulesSkye.B.GeeWhizz.C.CharlotteStone.D.JamesPickering.22.Atwhichplacecanpeopleofdifferentagesenjoyagoodlaugh?A.TheCyclopsTheatreB.KaleidoscopeC.VictoriaStageD.PizzaWorld23.WhatdoweknowaboutSimon'sWorkshop?A.Itrequiresmembershipstatus.B.Itlaststhreehourseachtime.C.Itisrunbyacomedyclub.D.ItisheldeveryWednesday.24.WhenwillCharlotteStoneperformhersongs?A.5.00pm﹣7.30pm.B.7.30pm﹣1.00am.C.8.00pm﹣11.00pm.D.8.30pm﹣10.30pm.
下列物质性质与应用对应关系正确的是
氯化亚铜CuCl常用作有机合成工业中的催化剂在空气中迅速被氧化成绿色见光则分解变成褐色．下图是工业上用制作印刷电路的废液含Fe3+Cu2+Fe2+Cl﹣生产CuCl的流程 根据以上信息回答下列问题 1写出生产过程中XY． 2写出产生CuCl的化学方程式． 3在CuCl的生成过程中理论上不需要补充SO2气体结合化学方程式和必要的文字说明理由． 4在CuCl的生成过程中除环境问题安全问题外你认为还应该注意的关键问题是． 5实验探究pH对CuCl产率的影响如下表所示 析出CuCl晶体最佳pH为当pH较大时CuCl产率变低的原因是． 6氯化亚铜的定量分析 ①称取样品0.25g和10mL过量的FeCl3溶液于250mL锥形瓶中充分溶解． ②用0.10mol•L﹣1硫酸铈[CeSO42]标准溶液滴定． 已知CuCl+FeCl3═CuCl2+FeCl2Fe2++Ce4+═Fe3++Ce3+． 三次平行实验结果如下平行实验结果相差不能超过1% 则样品中CuCl的纯度为结果保留三位有效数字．
背景材料 ①浙大研制的石墨烯弹性气凝胶又名碳海绵入选2013年度世界最轻固体材料 ②2014年11月上旬北京APEC峰会期间政府重拳整治雾霾蓝天重现 ③中科大最近成功发现了一种新的铁基超导材料Li0.8Fe0.2OHFeSeSe呈﹣2价． ④瑞典皇家理工学院KTH的研究人员已经成功的构建出了一种能使水快速氧化成氧气的分子催化剂． 下列说法不正确的是
30分Mygrandmotherwasalwaysencouragingmetosetgoalsandworkhardtoachievethem.Shewouldtellmenottobeafollowerandnottoset1onwhatIcouldachieve.She2believedthattherewerenolimitsthatyoucould3whateveryouwanted.Iwouldneverforgetthefollowingstorythatsheoncetoldme.Afarmerwonfirst4atthecountryfairforhishugeradish小萝卜thatwastheexactshapeand5ofamilkbottle.Manywere6astohowthefarmerwasabletogrowthisradishthatwastheexactshapeofamilkbottle.7onegentlemanwentuptothefarmerandaskedthequestion.Thefarmerreplied'Itwas8.IgottheseedgrowingandthenIputitintothemilkbottle.Ithad9elsetogo.'Youcanusethisstoryasananalogy比喻tolife﹣ourlivesare10bythekindofsurroundingsweplaceourselvesinthepeoplethatweallowto11usandthegoalswegiveourselves.Ifweonly12andtakenoactionthenwegetnofurther.Butifwe13setagoalandtakeactionthenourlifetakesa14shape.Goalsandactionscanhelpusaccomplishmoreinayearthanwhatsomepeoplewillaccomplishinalifetime.Toprovethis15readthebiographiesof16peopleandyouwillseethatgoalsandactions17playedabigroleintheirsuccess.Rememberthe18ofMaryKayAshwhosaid'Don'tlimityourself.Manypeoplelimitthemselvestowhattheythinktheycando.Youcango19yourmindletsyou.Whatyoubelieverememberyoucanachieve.'Insummarydon'tputyourselfinabottleinotherwordsmoveoutofwhatis20andsecureifyouwanttomoveforward.1A.expectations B.rules C.limits D.lines2A.truly B.naturally C.tightly D.partly3A.win B.grasp C.realize D.achieve4A.price B.prize C.position D.award5A.size B.length C.weight D.height6A.doubtful B.worried C.anxious D.curious7A.Immediately B.Gradually C.Finally D.Actually8A.strange B.easy C.funny D.secret9A.nowhere B.everywhere C.somewhere D.anywhere10A.shaped B.formed C.controlled D.improved11A.understand B.help C.influence D.contact12A.dream B.refuse C.doubt D.change13A.struggle B.refuse C.continue D.plan14A.beautiful B.different C.solid D.clear15A.truth B.lesson C.point D.evidence16A.successful B.brave C.friendly D.careful17A.asusual B.aboveall C.atall D.infact18A.case B.wisdom C.thought D.speech19A.asif B.incase C.asfaras D.aslongas20A.comfortable B.valuable C.ordinary D.boring
25℃时下列各组离子在指定溶液中一定能大量共存的是
Hundredsofpeoplehaveformedimpressionsofyouthroughthatlittledevice装置onyourdesk.Andthey'veneveractually41you.Everythingtheyknowaboutyou42throughthisdevicesometimesfromhundredsofmilesaway.43heyfeeltheycanknowyou44fromthesoundofyourvoice.That'showpowerfulthe45is.Powerfulyesbutnotalways46.ForyearsIdealtwithmytravelagentonlybyphone.RanimyfacelessagentwhomI'dnevermet47gotmerock﹣bottompricesonairfarescarsandhotels.Buthercoldvoicereally48me.Isometimeswishedto49anotheragent.OnemorningIhadto50animmediateflighthomeforafamilyemergency.IranintoRani'soffice51.Thewomansittingatthedesk52mymadnesssympatheticallyjumpedup.Shegavemea53smilenoddedwhilelisteningpatientlyandthenprintedoutthe54immediately.'Whatawonderfullady!'Ithought.Rushingout55Icalledoutovermyshoulder'Bythewaywhat'syourname?''I'mRani'shesaid.Iturnedaroundandsawa56womanwithabigsmileonherfacewavingtowishmeasafetrip.Iwas57!WhyhadIthoughtshewascold?Raniwaswellso58.SittingbackinthecaronthewaytotheairportIfigureditallout.Rani's59﹣﹣﹣herwarmsmilehernodsher‘I'mhereforyou'60﹣﹣﹣wereallsilentsignalsthatdidn'ttravelthroughwires.41.A.accepted B.noticed C.heard D.met42.A.came B.moved C.ran D.developed43.A.Thus B.Yet C.Then D.Indeed44.A.rather B.also C.just D.already45.A.Telephone B.voice C.connection D.impression46.A.direct B.useful C.easy D.accurate47.A.inperson B.bymyself C.inpublic D.onpurpose48.A.annoyed B.interested C.discouraged D.confused49.A.promote B.train C.find D.know50.A.arrange B.postpone C.confirm D.book51.A.forthefirsttime B.atanytime C.fromtimetotime D.ingoodtime52.A.expecting B.seeing C.testing D.avoiding53.A.shy B.comforting C.familiar D.forced54.A.bill B.form C.ticket D.list55.A.hopefully B.disappointedly C.gratefully D.regretfully56.A.careful B.serious C.nervous D.pleasant57.A.amused B.worried C.helpless D.speechless58.A.calm B.nice C.proud D.clever59.A.forgiveness B.eagerness C.friendliness D.skillfulness60.A.explanation B.attitude C.concept D.Behavior
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