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若a<b<0,则下列不等式中一定不成立的是( )
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已知有下列不等式1234其中一定成立的不等式的序号是________________
已知a>b>0给出下列四个不等式①a2>b2②2a>2b-1③④a3+b3>2a2b.其中一定成立的
若a>b则下列不等式中不成立的是
a+5>b+5
a﹣5>b﹣5
5a>5b
﹣5a>﹣5b
下列不等式不成立的是
-2>-
5>3
0>-2
5>-1
若a<0则下列不等式不成立的是
a+5<a+7
5a>7a
5﹣a<7﹣a
若a<b<0则下列不等式中一定不成立的是
|a|>﹣b
若3x>-3y则下列不等式中一定成立的是
x+y>0
x-y>0
x+y<0
x-y<0
若a<b<0则下列不等式中一定不成立的是
|a|>﹣b
对于任意的以下不等式一定不成立的是
若一次函数y=ax+b的图象经过第一二四象限则下列不等式一定成立的是
a+b<0
a﹣b>0
ab>0
<0
若a>b>0则下列不等式不成立的是
|a|>|b|
若3x>-3y则下列不等式中一定成立的是
x+y>0
x-y>0
x+y<0
x-y<0
若a<b<0则下列不等式中一定不成立的是
|a|>﹣b
若a<b<0则下列不等式中一定不成立的是
|a|>﹣b
若a<b<0则下列不等式中一定不成立的是
|a|>﹣b
下列不等式不成立的是
-2>-
5>3
0>-2
5>-1
若函数y=fx在0+∞上的导函数为f'x且不等式xf'x>fx恒成立又常数ab满足a>b>0给出下列
若a<b则下列不等式中不成立的是
a+5<b+5
5a<5b
a﹣b<0
﹣5a<﹣5b
若a>b则下列不等式中不成立的是
a+5>b+5
a﹣5>b﹣5
5a>5b
﹣5a>﹣5b
若a>b>0则下列不等式不成立的是
<
|a|>|b|
a+b<2
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常温常压下将NH3缓慢通入饱和食盐水中至饱和然后向所得溶液中缓慢通入CO2整个实验进程中溶液的pH随通入气体体积的变化曲线如图所示实验中不考虑氨水的挥发.下列叙述不正确的是
下列有关叙述正确的是
图示为一种天然产物具有一定的除草功效下列有关该化合物的说法正确的是
硼氢化钠NaBH4为白色粉末容易吸水潮解可溶于异丙胺熔点﹣101℃沸点33℃在干空气中稳定在湿空气中分解是无机合成和有机合成中常用的选择性还原剂.某研究小组采用偏硼酸钠NaBO2为主要原料制备NaBH4其流程如下 下列说法不正确的是
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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.
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
黑火药在适当的外界能量作用下能进行迅速的燃烧瞬间产生大量的热并生成氮气二氧化碳等气体由于体积急剧膨胀压力猛烈增大于是发生了爆炸.反应方程式为S+2KNO3+3C═K2S+N2↑+3CO2↑下列说法不正确的是
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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