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科研人员为研究小鼠肥胖形成的内在机制，以小鼠为实验材料，进行了一系列的观察和探究实验． （1）通过观察发现小鼠脂肪组织里穿插着一些交感神经，这些交感神经末梢会释放 并与脂肪细胞表面的特异性受体...
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高三下学期生物《》真题及答案
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小鼠是遗传学常用的实验材料性别决定方式为XY型下面是关于小鼠某些性状的遗传实验1在一隔离饲养了多代的
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实验表明PLCEl基因具有原癌基因的功能
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实验组的裸小鼠大量癌细胞的细胞周期受影响
20世纪60年代加州大学伯克利分校进行了一系列关于小鼠认知能力的实验在实验中一组小鼠被放在摆满各种玩
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仔细阅读下面例题解答问题 例题已知二次三项式x2﹣4x+m有一个因式是x+3求另一个因式以及m的值． 解设另一个因式为x+n得 x2﹣4x+m=x+3x+n 则x2﹣4x+m=x2+n+3x+3n ∴． 解得n=﹣7m=﹣21 ∴另一个因式为x﹣7m的值为﹣21 问题仿照以上方法解答下面问题 已知二次三项式2x2+3x﹣k有一个因式是2x﹣5求另一个因式以及k的值．
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8分Apaperclipmadeofsteelwirebentintoalooped环形的shapeisaninstrumentusedtoholdsheetsofpapertogether.Thiscommondeviceisawonderofsimplicityandfunction.Butwheredidthissimplecheapandpracticalinventioncomefrom? Inthelate19thcenturythemostcommonwaytoholdpaperstogetherwasbyusingapin.Althoughthepinwasaninexpensivetoolandwaseasilyremovableitwould1eaveholesinthepaper.Laterassteelwirebecamemorecommoninventorsbegantonoticeitselastic有弹性的feature.Withthisfeatureitcouldbestretchedandtwistedintovariousclip﹣likeobjects.Intheyearsjustbefore1900quiteafewpaperclipdesignsappeared.ThenamemostfrequentlyassociatedwiththepaperclipinventionisJohanVaaleraNorwegianinventor.HoweverVaaler'sclipswerenotthesameasthepaperclipscurrentlyinuse.Specificallytheydidnothavetheinsideloopweseetoday.ThefamiliarloopeddesignwasinventedbyGemManufacturingLtd.inEngland.ThisclipisthereforesometimesknownastheGemclip. BecauseofVaalerthepaperclipplayedanimportanthistoricalroleinNorway.DuringWorldWarIINorwaywasoccupiedbytheNazis.Norwegianswereprohibitedfromwearinganysymboloftheirnationalunity团结suchasbuttonswiththeinitialsoftheirking.Thusinprotesttheystartedwearingpaperclipstoshowtheirunity.Thereasonfordoingthiswassimple:PaperclipswereaNorwegianinventionwhoseoriginalfunctionwastobindtogether.AfterthewaragiantpaperclipstatuewasputupinOslotohonourVaaler﹣eventhoughhisdesignwasneveractuallyproduced. 1.Accordingtothefirstparagraphthepaperclipis. A.madeofpaper B.forholdingclothestogether C.shapedlikeapin D.inexpensiveanduseful 2.Onewaythepaperclipisbetterthanthepinisthat A.itischeaper B.itissimpler C.itdoesn'tdamagethepaper D.itcanberemovedmoreeasily 3.WhichofthefollowingbestshowswhattheGemcliplookslike? 4.Thelastparagraphismainlyabout. A.howwidelyusedVaaler'sclipis B.howVaaler'sclipbecameanationalsymbol C.howtheNazisruledtheNorwegianpeople D.whyNorwegianshadtheinitialsoftheirkingontheirbuttons
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30分 TheWorldAlwaysMakesWayfortheDreamer WhenIwastwelveyearsoldmyfathertookmetoseeZigZigler.IremembersittinginthatdarkhalllisteningtoMr.Zigler1everyone'sspiritsuptotheceiling.I2therefeelinglikeIcoulddoanything.WhenwegottothecarIturnedtomyfatherandsaidDadIwantto3peoplefeellikethat.Myfatheraskedme4Imeant.IwanttobeamotivationalspeakerjustlikeMr.ZiglerIreplied.AAn5wasborn. RecentlyIbeganseekingmydreamofmotivatingothers.6afour﹣yearrelationshipwithFortune100Company7asasales﹣trainerandendingasaregionalsalesmanagerIleftthecompanyattheheightofmy8.Manypeoplewere9thatIwouldleaveafterearningasix﹣figureincome.Andtheywondered10Iwouldriskeverythingforadream. Imademy11tostartmyowncompanyandleavemysecurepositionafter12aregionalsalesmeeting.Thevice﹣presidentofourcompanydelivereda13thatchangedmylife.HeaskedusIfagodwouldofferyouthreewisheswhatwouldtheybe?Aftergivingusa14towritedownthethreewisheshethenaskedusWhydoyouneeda15?IwouldneverforgetthepowerIfeltatthatmoment.Irealizedthat16Ihadaccomplishedinthepasthadpreparedmeforthismoment.Iwasreadyanddidn'tneedagod'shelptobecomeamotivationalspeaker.Amotivationalspeakerwas17. HavingmadethatdecisionIwasimmediately18.OneweekafterIgavenoticemyhusbandwaslaidofffromhisjobandnowwehadno19.ButIheldfasttomydream.Thewonderreallybegantohappen.Inashorttimemyhusbandfoundabetterjob.AndIwasabletobookseveral20engagementswithnewcustomers.Idiscoveredtheunbelievablepowerofdreams. 1.A.rise B.blow C.put D.raise 2.A.left B.came C.arrived D.reached 3.A.get B.hope C.make D.cheer 4.A.that B.what C.which D.if 5.A.dream B.idea C.girl D.speaker 6.A.After B.Before C.Because D.While 7.A.beginning B.working C.acting D.regarding 8.A.life B.love C.income D.career 9.A.disappointed B.moved C.surprised D.delighted 10.A.when B.why C.if D.how 11.A.plan B.promise C.decision D.mind 12.A.attending B.joining C.entering D.holding 13.A.newspaper B.book C.report D.speech 14.A.day B.second C.week D.moment 15.A.help B.job C.god D.company 16.A.everything B.anything C.nothing D.something 17.A.alive B.dead C.missing D.born 18.A.examined B.searched C.checked D.tested 19.A.help B.harm C.income D.money 20.A.selling B.speaking C.writing D.listening
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某白色固体甲的主要成分为NaCl可能含有MgCl2KClBaCl2和NaOH中的一种或几种杂质为检验白色固体甲的成分并除去其中杂质进行如下实验 1写出生成白色固体丙的化学方程式 2向无色溶液D中加入过量稀盐酸的目的是 3分析上述实验可知白色固体甲中一定没有的物质是 4若用上述实验中的ABCD四种溶液鉴别稀H2SO4和NaOH溶液分别取样后按下图所示操作进行实验就能达到鉴别目的的是实验
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互联网给生活带来极大的方便据报道2016底全球支付宝用户数为4.5亿2018年底达到9亿． 1求平均每年增长率 2据此速度2020底全球支付宝用户数是否会超过17亿请说明理由．参考数据≈1.414
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