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下列物质中，属于纯净物的是（ ）
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下列物质中属于纯净物的是
纯净的空气
水银
稀盐酸
不锈钢
下列物质中属于纯净物的是
纯净的空气
水银
稀盐酸
不锈钢
下列物质中属于纯净物的是
胆矾
水泥
纯净的盐酸
普通玻璃
下列物质中属于纯净物的是
冰水混合物
纯净的盐酸
洁净的空气
CuSO
4
溶液
下列各组物质中从物质分类的角度看后者从属于前者的是
纯净物、混合物
金属、非金属
纯净物、化合物
含氧酸、无氧酸
下列物质中属于纯净物的是
纯净的空气
纯净的氮气
盐酸
碘酒
下列物质中属于纯净物的是
空气
海水
生铁
冰水共存物
下列几种物质水氧气氢气铁氯化钠海水属于混合物的是属于纯净物的是上述纯净物中属于单质的是属于化合物的是
下列物质中属于纯净物的是
18K黄金
水银
矿泉水
纯净的盐酸
下列物质中中属于纯净物的是
双氧水
冰水共存物
海水
空气
下列物质中属于纯净物的是
纯净的空气
烧碱
75%的医用酒精
矿泉水
纯净物是由一种物质组成的下列物质属于纯净物的是
纯净水
纯净的空气
二氧化碳
矿石
下列物质中属于纯净物的是
洁净的空气
纯净的食盐水
pH= 7的溶液
四氧化三铁
下列物质中属于纯净物的是
冰水混合物
纯净的盐水
洁净的空气
CuSO
4
溶液
下列物质中属于纯净物的是
洁净的空气
纯净的食盐水
冰水混合物
水泥砂浆
下列物质中属于纯净物的是
下列物质中前者属于纯净物后者属于混合物的是【】
医用酒精、空气
纯净水、冰水混合物
苛性钠、盐酸
黄铜、石灰石
研究物质的性质必须取用纯净物下列物质中属于纯净物的是
空气
啤酒
干冰
硬水
下列物质中属于纯净物的是
娃哈哈纯净水
澄清石灰水
蒸馏水的冰水混合物
生铁
下列物质中属于纯净物的是
沙子
水
牛奶
茶
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8分Thepalm﹣forward掌心向外'V'signformedbyraisingandspreadingtherirsttwofingershasthreedifferentmeaningsinAmericanculture.Themostpopularmeaningofthe'V'signwasinventedin1941byaBelgiangVictorDeLavalaye.WantingasymbolforresistancetotheNazioccupationhecameupwiththesingleletter'V'whichstoodnotonlyforhisownfirstnamebutalsoforEnglishvictoryFlemishvirijheidandFrenchvictoire.ThesymbolismofthesignspreadveryquicklyandWinstonChurchilluseditconstantlyinpublicappearance.Thusthroughoutthe1940sand1950sthegesturemeantsimply'victory'.Thesecondmeaningcameinthe1960s.BecauseofitsmilitaryimplicationAmericanantiwarprotestorsusedthesignsarcasticaUy讽刺地againstthearmssothatitbecameknownasthe'peacesign'.Inthe1970sthe'W'signwhichhadlostitsmilitaryimplicationwasacommongrPltingamongfreedomloversacidheadspoliticalradicalsandultimatelyyoungpeopleingeneral.Sobyaboutthemiddleofthe1970sitnolongergavecluetotheuser'sphilosophy.Thethirdmemungistheoldestandleastcommon.Americanchildrenjokinglyput'V'whichresembles'horns'behindfriends﹣headsingroupsnapshot.TheyareunknowinglyreproducingsomethingthatsouthemEuropeanswouldfindhighlyoffensive.Thismischiefcalled'hornsoftheDevil'isavariantoftheEuropean'horns'gesture9wluchisobscene猥亵的.Herethe'w'signmeans'Yourwifehasbeencheatingonyouorwhenplacedbehindanother'sheadhiswifehasbeencheatingonhim.'IntheUnitedStatesthegestureistypicallygivenwiththepalmfacingtheviewer.TheBritishuseboththisversionandanolderpalm﹣backwardversion;thelatterisobsceneinAmericancultureandcorrespondstotheAmerican'finger'.Churchillgotsomesurprisedstaresin1941whenevidentlyunawareofthemeanusagehegavethepalm﹣backward'V'toBritishtroops.InEnglandtodayyoucouldhavetobeasocialhermitnottounderstandthedistinction.AstonishinglyhoweverMargaretThatcherrepeatedChurchill'senorafterhervictoryinthe1979election.1What'sthemostpopularmeaningofthe'V'sign?A.VictoryB.Peace.C.Cheat.D.Freedom.2WhydidChurchillgetsomesurprisedstaresaccordingtothelastparagraph?A.Hewasproudofhistroops.B.Hehadwantedtobeahermit.C.Hewasinsensibleofthemeanusageofthe'V'sign.D.HewantedtoshowcongratulationstoBritishtroops.3Whatcanbeleamedfromthetext?A.The'V'signsimplymeansvictorysince1941.B.The'V'signmeaningpeacewasinventedbyaBelgian.C.ThatchermadethesameerrorasChurchillafterhersuccessfulelection.D.AmericanantiwarprotestorsusedthesigntogreetamongfreedomloveyS.4Whatcanweconcludefromthepassage?A.It'snevertoooldtoleam.B.Thinkwellbeforeyouspeak.C.Actionsspeaklouderthanwords.D.Trytoknowculturediversityfullyandregionally.
下列实验操作正确且发生化学变化的是
10分ItissaidthatsomeoneonceaskedAlexandertheGreat'Wouldyoutakethenextcityifyouhadtheopportunitytodoso?'theGreatConquerorreplied'Opportunity?1;Icreateopportunities.'Alexander'swordstellusthatweshouldnotwaitforanopportunitytodosomething.2.Butthemostsuccessfulpeopledonotwaitforasuitableopportunity.Theycreateanopportunityforthemselves.JohnBunyanoneoftheworld'sgreatestwriterswrotePilgrims'Progress.ThisbookisamasterpieceofEnglishliterature.Doyouknowwherehewaswhenhewrotethismasterpiece?Hewasinprison.3.Hecreatedanopportunityforhimselfbyusingthetimeavailableintheprison.MichealFaradaythegreatscientistwasnotabletogetevenaprimaryeducationbecausehisfamilywaspoorandhehadtowork.Whenhewasthirteenyearsoldabookbinder装订商employedhim.4.Hereadasmuchashecould.Soonheleftthebookbinderandconcentratedhiseffortsonbecomingascientist.5.Eventhoughanopportunitydoesnotseemtobeoftherightkindyoushouldtakewhatevercomesyourwayandmakethebestofit.Ifyoudonotgoonwaitingforanopportunitybutdotheworkonhandtothebestofyourabilityyou'llbeabletoworkwonders.A.Idon'twaitforopportunitiesB.TimeandTidewaitfornomanC.OpportunitiesareallaroundyouD.SohehadaccesstoavarietyofbooksE.WisepeopleseizethefirstopportunitytoachievetheirdreamsF.HecouldnotwaittogetoutofprisonandsitatadesktowritehisbookG.Goodluckcomeswhenanopportunitycomesalongandyou'repreparedforit
6分Herearesomefancyitemshighlyrecommendedtoyoutoenrichorimproveyourdailylife. Beautyofmushrooms ArtistandphotographerJillBlisswillchangeyourviewofmushroomswithherphotoswhichyoucanfindathttp://bit.ly/mushroomphotos.Blissarrangesmushroomsandotherobjectssheseesinnaturealmostlikebunchesofflowers. OutintheStorm Allthecomponentsofgreatpopmusic﹣excitingsongwritingacommandingsingerandabandthatplayswithtotalcommitment﹣arethereandshininglikediamondsonWaxahatchee'snewalbumOutintheStorm.Inwhat'sturningouttobeaveryimpressiveyearforfemalebandleaderswriter/singerKatieCrutchfieldandherrockingall﹣femalebandareexperiencingonesuccessafteranother. Circa Ifyou'retiredfromyourinternationalflighttryingtorememberifthekidswillstillbeawakeforyourcallortoscheduleaconferencecallforworktheappCircacanhelpyoukeeptrackoftimeindifferenttimezonesoftheworld.It'llgiveyouonelessthingtoworryabout.Theappis﹩3.99foriOSandfreeforAndroidusers. TheirFinest ThemovieTheirFinestsetduringWorldWarⅡcentersonthefilmdivisionoftheBritishMinistryofInformationwhereCatrinColeGemmaArtertonisemployedmakingmoviesthatappealtowomen.FilmcriticPeterRainerwritesthatthefilm'sbestcomiccharacterisAmbroseHilliard…performedwithplentyofplayfulfunbythatgreatscene﹣stealerBillNighy.TheirFinestisavailableonDVDandBlu﹣ray. 1WhatdoweknowaboutKatieCrutchfield'sband? A.Itperformsfolkmusic. B.Itstargetaudienceiswomen. C.Itisanovernightsuccess. D.Itsmembersarefemale. 2WhatisthemainfunctionoftheappCirca? A.Totellworldtimeacrossdifferentplaces. B.Torecordusers'importantmeetings. C.Toremindusersofinternationalcalls. D.Torecommendoverseasflightstousers. 3WhichofthefollowingisoneofthecharactersinthemovieTheirFinest? A.GemmaArterton. B.AmbroseHilliard. C.PeterRainer. D.BillNighy.
对下面符号数字示意图的理解正确的是
“结构决定性质性质决定用途”是学习化学的重要思想方法．下列说法中正确的是 ①钠原子和钠离子质子数相同所以它们的化学性质相同 ②金刚石和石墨中碳原子排列方式不同所以它们的物理性质差异很大 ③水和过氧化氢的分子构成不同所以它们的化学性质不同 ④氮气常温下化学性质稳定所以可用于制氮肥 ⑤洗涤剂具有乳化功能所以可去除油污 ⑥烧碱能与酸发生中和反应所以可用于改良酸性土壤．
有ABC三种物质已知A是一种氯化物B是一种酸含有三种元素C是一种碱．图甲表示ABC三种物质的溶液两两混合时的实验现象请回答 1生成D的化学式为 2ABC之间能发生个复分解反应 3将一定质量镁锌两种金属同时放入A溶液中充分反应过滤滤液为无色则滤液中一定含有的阳离子为写离子符号 4若金属MN分别为铁和锌中的一种分别与等质量等溶质质量分数的B溶液反应产生氢气的质量与反应时间的关系如图乙所示反应结束后只有一种金属有剩余则剩余金属为用MN表示．
如图是某同学测定“小灯泡功率”的实验电路图小灯额定电压为2.5V．在实验中至少要多次调节滑动变阻器电键闭合前滑片P应处于选填“a”或“b”端其目的是使然后接通电路再次调节目的是使．在实验时测得的数据如表．在整理数据计算功率时发现其中一次实验结果与其他两次实验结果相差很大经检查原来是有一个电流的示数读错了．该同学选用的电流表的量程是0﹣0.6安．试分析数据表中第次电流的读数错了正确的应为小灯泡额定功率P额＝瓦．
15分Whydomanyofusfind1difficultorimpossibletofallasleepinabedotherthanourown?Isitbecausethebedis2comfort?AccordingtoanewstudypublishedinCurrentBiologyasignificantreasonis3thescientistscallfirstnighteffect.Theybelievethatonesideofthebrainactsasanightwatchtowarnusaboutpotentialdangers.Itforcesus4stayawakeonthefirstnightinanewenvironment. Forthestudy35youngvolunteers5asktosleepinasleeplabforseveraldays.Meanwhileresearcherswatchedtheirbrainactivities. Accordingtotheresearchersontheirfirstnighttheleftbrainswere6activethantherightbrainsandpeoplehadahardtimesleeping.Howeverleft﹣brainactivitydecreasedasdayswentby7falleventothepointofcompletecalm.Inthisprocesstheparticipantsgotanincreasinglybettersleepexperience. The8findingsuggestthatthedifferentrhythmsofthesidesofthebrainaffectoursleep.Whenthetwosideswork9differentthebalancebetweenthemisbroken.Thusthebraincan'trelaxandissensitivetoanythingstrangeinthesurroundingsjust10itisinthedaytime.
推理是化学学习中常用的思维方法以下四个推断中正确的是
请根据如图ABC三种物质的溶解度曲线回答下列问题 1温度越高溶解度越小的物质是 2t1℃时物质A和C的溶解度均为25g其饱和溶液中溶质的质量分数为． 3t℃时把等质量的A和C配成饱和溶液A的饱和溶液质量大于C温度t的范围是． 4下列说法正确的是填序号 ①将t1℃的ABC三种溶液分别升温其浓度都不可能发生变化 ②将t1℃的ABC三种溶液分别降温其浓度都可能发生变化 ③将t2℃的ABC三种饱和溶液的温度分别降至t1℃时A溶液中析出的晶体最多 ④在温度为t2℃时ABC三种溶液的溶质质量分数可能相等．
8分AfunnythinghappenedbetweenChina'sfirstfemaleNobelPrizewinnergivingheracceptancespeechinSwedenandthatspeechreachingherhomecountryTwoentirelydifferentversionsappearedandthefakeonebecameaviralhit. Guesswhichversionisreal?Theonethatmatter﹣of﹣factlytellsaboutthediscoveryofartemisinin青蒿素ortheonewithextremeliterarystylecompletewithherfatherexplainingtheoriginofhergivennameandpoeticlinessuchasIliketranquility宁静tranquilastheleavesofsweetwormwood蒿草;Ishunthespotlightjustasthepetalsofsweetwormwooddo;Iaspire追求tobeuprightasarethestemsofsweetwormwood. WellsweetwormwoodistheplantfromwhichTuandherfellowscientistssuccessfullyextractedartemisinin.Manyreadersweresotouchedbytheliteraryversionthattheywereleftintears. TheyjustforgotthatTuisnotawomanoflettersbutoneofscience.Itwascompletelymadeupbysomeonewhoobviouslyhasgreatliterarytalentbutcouldnotunderstandtheinnerlifeofascientist.IhavenotmetagreatmanyscientistsChineseorforeignbuttheonesIhavespokentohavebeenno﹣nonsenseandwouldnotusesuchliterarylanguage. Idon'tknowwhomadeuptheTuspeechorforwhatpurpose.Itdoesnotstrikemeasfunny.Fortunatelynomainstreammediaseemedtohavebeenfooled.YetthefakeonehasprobablybeensharedmorethantherealonebecauseitplayedtotheChinesestereotype固定形式ofwhatsuchaspeechshouldbe. China'scyberspace信息空间isfullofeducationalandupliftingquotesandquitealotofthemaremadeup.ThereisajokethatsaystheUnitedStates'spyingnetworkcollectedandexaminedalltheInternetdatainChinaandfoundthattheChineseareaddictedtosuchchickensoupincludingthatfromuntrustworthysources. 1Whymanyreadersweremovedtotearsbythefakespeech? A.Becauseitwaswritteninliterarystyle. B.BecauseitwasonthebasisofTu'sreallife. C.Becausethereadershadpassionforscience. D.BecausethereadersknewabouttheoriginofTu'sgivenname 2Whomightbetheauthorofthefakespeech? A.ReporterfromtheUnitedStates'spyingnetwork B.Awriterwithgreatknowledgeofthesciences. C.OneofTu'sfans. D.Someonewithgreattalentinwriting. 3Whythefakespeechhasbeensharedmorethanrealone? A.Becausemanymainstreammediaswerefooled. B.BecauseitwastheChinesestereotype. C.Becauseitwasfunny. D.Becausethewriterunderstoodtheinnerlifeofascientist. 4Thepurposeofthearticleisto. A.provethatChineseareaddictedtofakenews. B.findoutwhomadeupthefakespeech. C.totellustherearelotsoffakenewsintheinternet D.provethatChinesescientistshavenoliterarytalent
8分HaveyoueverheardsomeonesayYoutotallylooklikeyou'reaJessicaorsomethingsimilar?PeopleseemtothinkthattheyknowwhatkindofpersonaJessicaoraMichaellookslike.Whyisthis? AccordingtoastudypublishedintheJournalofPersonalityandSocialPsychologyhumanstendtoassociatepeople'snameswiththeirappearancesandcanevenguesssomeone'snamebasedonhowtheylook. ResearchersattheHebrewUniversityofJerusalemIsraelcollectedthousandsofphotosofpeople'sfaces.Theylabeled贴标签于eachphotowithfournames.Thentheyaskedvolunteerstoguesswhichofthefournameswascorrect. Thevolunteerswereabletoguesstherightname38%ofthetime.Itseemsthatcertaincharacteristicsoffacesgivethemcluesaboutsomeone'snameReader'sDigestreported. Howeverthisonlyworkedwhenthevolunteerslookedatnamesfromtheirownculture.Inadditionthevolunteerswerenotasgoodatguessingtherealnamesofpeoplewhousednicknames昵称moreoftenthantheirrealnames.Thismayshowthataperson'sappearanceisaffectedbytheirnameonlyiftheyuseitoften. Thiskindofface﹣namematchinghappensbecauseofaprocessofself﹣fulfillingprophecy预言aswebecomewhatotherpeopleexpectustobecomeRuthMayofromtileuniversitytoldsciencenewswebsiteEurekAlert. Earlierstudieshaveshownthatgender性别andracestereotypes刻板印象canaffectaperson'sappearance.Theresearchersbelievetherearealsosimilarstereotypesaboutnames.ForexamplepeopletendtothinkthatmennamedBobshouldhaverounderfacesbecausetheworditselflooksround.PeoplemaythinkthatwomennamedRosearebeautiful.Theyexpectthemtobedelicateandfemalejustliketheflowertheyarenamedfor. 1Howisthisarticledeveloped? A.Bygivingexamples. B.Byaskingquestions. C.Bydoinganexperiment. D.Bycomparingdifferentcases. 2Whatcanbeinferredfromthestudy? A.Volunteersfounditmucheasiertoguessnicknames. B.Nameshavedifferentassociationsindifferentcultures. C.Volunteerscouldguessthecharacteristicsoftheinterviewees. D.Thepeopleinthephotosandvolunteerswerefromthesameculture. 3WhydosomepeoplelookliketheirnamesaccordingtoRuthMayo? A.Theywanttopleaseeveryonearoundthem. B.Theydon'twanttobedifferentfromothers. C.Theytendtobecomewhatothersexpectthemtobecome. D.Theyliketocopyfamouspeoplewhosharethesamename. 4Whatmaybethebesttitleforthispassage? A.Whatdeterminesournames B.Whywelooklikeournames C.Howwegetridofourstereotypes D.Howstereotypesaffectpeople'slooks
下列各组变化中每个转化在一定条件下均能一步实现的是
15分Mobilepaymentshavemadeourlifemoreconvenientand1enjoybyfreeingusfromthetroubleofhavingtotakeourwalletsoutwithus.Butasupermarkethasgoneonestepfurtherallowingcustomerstopay2instantusingjustafingertip.ShoppersatonestoreatBrunelUniversitycanpayforitems3usethermiquevein静脉pattern.intheirfingertipsandit's4firststoretoadoptsuchtechnology.Thisnewmethodofpaymentmeansthatcustomerscanpayforitemsinjustafew5second.Sthalerthecompanybehindthetechnology6explainthatitusesirufraredscanners扫描仪7readthepattemofveinsinthefmger.Ithinksthistothecustomer'sbankdetailswhich8keepsafebypaymentproviderWorldpay.Thefirmisalsoresponsible.9millionsofonlineshoppers'detailsaroundtheglobe.'Therearenoknowncases10thissecurityhasbeenviolatedanddozensofBrunelstudentsarealreadyusingthetechnology'SimonBinnscommercialdirectorofSthalertoldthereporter.
8分Inspringchickensstartlayingeggsagainbringingawelcomesourceofproteinatwinter'send.Soit'snosurprisethatculturesaroundtheworldcelebratespringbyhonoringtheegg. SometraditionsaresimpleliketheredeggsthatgetbakedintoGreekEasterbreads.Othersupgradetheeggintoafancyartliketheheavilyjewel﹣coveredeggsthatwerefavoredbytheRussiansstartinginthe19thcentury. OneancientformofeggartiseggpaintingwhichcomestousfromUkraine.ForcenturiesUkrainianshavebeendrawingcomplicatedpatternsoneggs.ContemporaryartistshavefollowedthistraditionandadaptedthetraditionalmethodstocreateeggsthatspeaktotheanxietiesofourageLifeispreciousanddelicate.Eggsaretoo. There'ssomethingabouttheirdelicatenaturethatcrazilyappealstomesaysNewYorkercartoonistRozChast.SeveralyearsagoshebecameinterestedineggpaintingandlearnedthetraditionalUkrainiantechniquetodrawherverymoderncharacters.I'vebrokeneggsateverystageoftheprocess﹣fromtheverybeginningtotheveryveryend. Butthere'sanappealinthatvulnerability.There'spartofthissickeninghorrorthatIkindoflikethehorrorofknowingyou'rewalkingontheedgewiththisknowingthatitcouldallfallapartatanysecond.Chast'sdesignssuchasaworriedmanaloneinatinyboatreflectthatdelicateness. TraditionalUkrainiandecoratedeggsalsospoketothosefears.Thecomplexanddetailedpatternswerebelievedtoofferprotectionagainstevil. Eggpaintingartdatingbackto300B.C.waslaterabsorbedintotheChristianchurch.Theoldsymbolshoweverstillsurvive.Adecoratedeggwithabirdonitgiventoayoungmarriedcoupleisawishforchildren.Adecoratedeggthrownintothefieldwouldbeawishforagoodharvest. 1WhatdowelearnaboutthedecoratedeggsinRussia? A.Theyareshapedlikejewelcases. B.Theyareheavilypaintedinred. C.Theyarefavoredasaformofart. D.Theyarevaluedbytherich. 2Whyhavecontemporaryartistscontinuedthetraditionofeggpainting? A.Becauseeggsserveasasymbolofthecomingofspring. B.Becauseeggsprovideasourceofproteininwinter'send. C.Becauseeggsprovideauniquesurfacetopainton. D.Becauseeggsreflecttheanxietiesofpeopletoday. 3Whichofthefollowingbestexplainsvulnerabilityunderlinedinparagraph5? A.Delicateness. B.Technique. C.Fear. D.Anxiety. 4Whatisthemainideaofthetext? A.Eggpaintingartpreservestraditionalandpopularsymbols. B.Differentcultureshavedifferentwaysofhonoringtheegg. C.Ukrainianeggpaintingartappealstocontemporaryartists. D.Eggpaintingartcontinuesanddevelopsinpacewithtime.
10分I'vealwaysbeeninterestedinwhywedothethingswedosolastyearIdecidedI'dliketostudypsychology.MostcoursesIfoundhoweverwereeithertooexpensivetoolongorwereimpossibletocombinewithwork.Iwasabouttogiveup1. AtfirstIhadnoideawhattheyweretalkingaboutbuttheyexplainedthataMOOCisaMassiveOpenOnlineCourse﹣anewtypeofcourseofferedcompletelyonlinetothousandsofpeoplewhichisdesignedsothatanyonecanfollowitregardlessofagelocationoreducation﹣2.Youcansearchforhundredsofdifferentsubjectsandcanusuallywatchashortintroductionvideotogetanideaofwhatthecourseisabout. 3.AtfirstIdidn'tknowwhattoexpectorhowmuchtimeImightspendstudying.Eachweektherewerevideolecturestowatchandreadingstodoaswellassomeshortassignments.Thelectureswerereallyinterestingandeasytofollowanditwasgreattobeabletowatchthemagainorpausethemtogoanddosomethingelse.MostMOOCshaveonlineforums论坛toowherestudentscandiscusswhattheyarelearning.Theseareoftenreallyfascinatingbecausetherearesomanydifferentopinions4.Ifyoureadeverythingontheforumsyouwon'thavetimetofinishthelectures! 5.Thereisahugerangeofcoursesonofferinhundredsofsubjectsandyouhavethechancetolearnnewthingsandbeincontactwithmanydifferenttypesofpeopleallfromthecomfortofyourownhome.WhynotcheckoutaMOOCandstartlearningsomethingnewtoday? A.buttheyareverytime﹣consuming B.allyouneedisanInternetconnection C.whenafriendsuggestedthatItryaMOOC D.Ichoseasix﹣weekSocialPsychologycourse E.itisdifficulttofindacoursetocombinewithwork F.ButtheadvantagesofMOOCsforbusypeopletodayareobvious G.Infactthatseemstobeoneoftheproblemsofthisnewwayofstudying
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