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已知草酸镍晶体（NiC2O4•2H2O）难溶于水，工业上从废镍催化剂（主要成分为Ni，含有一定量的Al2O3、FeO、SiO2、CaO等）制备草酸镍晶体的流程如图所示： 已知：①相关金属离子生成...
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草酸乙二酸存在于自然界的植物中其K1=5.4×10－2K2=5.4×10－5草酸的钠盐和钾盐易溶于水
目前全世界的镍消费量仅次于铜铝铅锌居有色金属第五位镍行业发展蕴藏着巨大的潜力镍化合物中的三氧化二镍是
草酸乙二酸存在于自然界的植物中其K1=5.4×10－2K2=5.4×10－5草酸的钠盐和钾盐易溶于水
标定HCl溶液常用的基准物有
无水Na2CO3;
草酸（H2C2O4·2H2O）
CaCO3;
已知充分燃烧ag乙炔气体时生成1mol二氧化碳气体和液态水并放出热量bkJ则乙炔燃烧的热化学方程式正
2C2H2(g) + 5O2(g) = 4CO2(g) + 2H2O(l) △H=－4b kJ/mol
C2H2(g) + 5/2O2(g) = 2CO2(g) + H2O(l) △H=2b kJ/mol
2C2H2(g) + 5O2(g) = 4CO2(g) + 2H2O(l) △H=－2b kJ/mol
2C2H2(g) + 5O2(g) = 4CO2(g) + 2H2O(l) △H=b kJ/mol
草酸乙二酸存在于自然界的植物中其K1=5.4×10－2K2=5.4×10－5草酸的钠盐和钾盐易溶于水
三氧化二镍是一种重要的电子元件材料蓄电池材料工业上利用含镍废料以镍铁钙镁合金为主制取草酸镍NiC2O
已知MH2C2O4·2H2O=126.07g/molMMnO2=86.94g/mol软锰矿样品0.6
32.76%
37.93%
51.72%
84.48%
草酸乙二酸存在于自然界的植物中其K1=5.4×10－2K2=5.4×10－5草酸的钠盐和钾盐易溶于水
计算题准确称取草酸H2C2O4•2H2O126.066g溶于20L水中求C1/2H2C2O4•2H2
用含钴废料主要成分为Co含有一定量的NiAl203FeSiO2等制备草酸钴晶体CoC2O4·2H2O
标定HCl溶液常用的基准物有
无水Na2CO3;
硼砂（Na2B4O7·10H2O）;
草酸（H2C2O4·2H2O）
三氧化二镍Ni2O3是一种重要的电子元件材料和蓄电池材料工业上利用含镍废料镍铁钙镁合金为主制取草酸镍
三氧化二镍Ni2O3是一种重要的电子元件材料和蓄电池材料工业上利用含镍废料镍铁钙镁合金为主制取草酸镍
草酸乙二酸存在于自然界的植物中其K.1＝5.4×10－2K.2＝5.4×10－5草酸的钠盐和钾盐易溶
草酸的分子式为
H2C2O2•1H2O
H2C4O2•2H2O
H2C2O4•2H2O
H2C2O2•2H2O
草酸亚铁晶体FeC2O4·2H2O是一种浅黄色固体难溶于水受热易分解是生产锂电池的原材料也常用作分析
草酸乙二酸存在于自然界的植物中其K1=5.4×10﹣2K2=5.4×10﹣5.草酸的钠盐和钾盐易溶于
草酸乙二酸存在于自然界的植物中其K.1=5.4×10－2K.2=5.4×10－5草酸的钠盐和钾盐易溶
草酸H2C.2O.4是生物体的一种代谢产物.草酸的钠盐和钾盐易溶于水而其钙盐难溶于水.已知草酸晶体H
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假定你是李华你所喜爱的美国家庭杂志Reader'sDigest读者创刊96周年之际征集读者意见请你依据以下内容给主编写封信内容主要包括 1.说明你是该刊的忠实读者 2.赞赏该刊的优点兼顾健康饮食文化等家庭生活的方方面面Advice栏目给了父母很多指导孩子健康成长的实用建议 3.提出你的建议. 注意 1.词数100左右开头和结尾已写好不计入总词数 2.可以适当增加细节以使行文连贯. DearEditor﹣in﹣chief Congratulationsonthe96thanniversaryofReader'sDigest! Yours LiHua
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1分Youngpeopleoftenoallsortsofwarningsignalsabouttheirownhealthafraidoflosingtheirjobs.
8分Someofthebestresearchondailyexperienceisrootedinratesofpositiveandnegativeinteractionswhichhasprovedthatbeingblindlypositiveornegativecancauseotherstobefrustratedorannoyedoreventotuneout. Overthelasttwodecadesscientistshavemaderemarkablepredictionssimplybywatchingpeopleinteractwithoneanotherandthenscoringtheconversationsbasedontherateofpositiveandnegativeinteractions.Researchershaveusedthefindingstopredicteverythingfromthelikelihoodthatacouplewilldivorcetothechancesofaworkteamwithhighcustomersatisfactionandproductivitylevels. Morerecentresearchhelpsexplainwhythesebriefexchangesmattersomuch.Whenyouexperiencenegativeemotionsasaresultofcriticismorrejectionforexampleyourbodyproduceshigherlevelsofthestresshormonewhichshutsdownmuchofyourthinkingandactivatesconflictanddefensemechanisms机制.Yousupposethatsituationsareworsethantheyactuallyare. Whenyouexperienceapositiveinteractionitactivatesaverydifferentresponse.Positiveexchangesincreaseyourbody'sproductionofoxytocin后叶催产素afeel﹣goodthatincreasesyourabilitytocommunicatewithcooperatewithandtrustothers.Buttheeffectsofapositiveoccurrencearelessdramaticandlastingthantheyareforanegativeone. Weneedatleastthreetofivepositiveinteractionstooutweigheveryonenegativeexchange.Badmomentssimplyoutweighgoodones.Whetheryou'rehavingaconversationkeepthissimpleshortcutinmindAtleast80percentofyourconversationsshouldbefocusedonwhat'sgoingright. Workplacesforexampleoftenseethis.Duringperformancereviewsmanagersroutinelyspend80percentoftheirtimeonweaknessesandareasforimprovement.Theyspendroughly20percentofthetimeonstrengthsandpositiveaspects.Anytimeyouhavediscussionswithapersonorgroupspendthevastmajorityofthetimetalkingaboutwhatisworkingandusetheremainingtimetoaddressweaknesses. 1TheunderlinedphrasetuneoutinParagraph1probablymeans. A.gaincourage B.stoplistening C.singaloud D.feelstressed 2Whatwillhappenifyouexperiencenegativeemotions? A.Muchofyourthinkingwillbeprevented. B.Thesituationsaresuretobecomeworse. C.Youwillfeelanurgetoimproveandbecomebetter. D.You'llbemotivatedtoresolveconflictswithpeople. 3FromParagraph4wecanlearnthat. A.weneedapositivefeelingtobeatonenegativefeeling B.theeffectofnegativefeelingslastslongerthanthatofpositiveones C.ourconversationshouldcenteronwhatneedsimprovement D.positiveinteractionshavegreatereffectsthannegativeones 4Whatisthebesttitleforthepassage? A.HarmfulNegatives. B.LessTimeonStrengthsandPositiveAspects. C.HowtoBeaProductiveManager. D.MorePositiveInteractions.
5分 TheArtofSlowReading IfyouarereadingthisarticleinprintchancesarethatyouwillonlygetthroughhalfofwhatIhavewritten.Andifyouarereadingthisonlineyoumaynotevenfinishafifth.1Theysuggestthatmanyofusnolongerhavetheconcentrationtoreadarticlesthroughtotheirconclusion. Soarewegettingstupider?Actuallyouronlinehabitsaredamagingthementalpowerweneedtoprocessandunderstandtextualinformation.Round﹣the﹣clocknewsmakesusreadfromonearticletothenextwithoutnecessarilyengagingfullywithanyofthecontent.OurreadingisfrequentlyinterruptedbythenoiseofthelatestemailandwearenowabsorbingshortburstsofwordsonTwitterandFacebookmoreregularlythanlongertexts.2Butwearegraduallyforgettinghowtositbackthinkcarefullyandrelateallthefactstoeachother. 3Adesperatebunchofacademicswantustotakeourtimewhilereadingandre﹣reading.Theyaskustoswitchoffourcomputerseverysooftenandrediscoverboththejoyofpersonalengagementwithprintedtextsandtheabilitytoprocessthemfully.What'stobedonethen?Mostslowreadersrealizethattotalrejectionofthewebisextremelyunrealistic.Theyfeelthatgetawayfromtechnologyforawhileistheanswer.4 PersonallyI'mnotsurewhetherIcouldevergoofflineforlong.EvenwhilewritingthisarticleIamswitchingconstantlybetweensitesskimmingtoooftenabsorbingtoolittle.Internetreadinghasbecometoorootedinmydailylifeformetochange.IreadessaysandarticlesnotinhardcopybutasPDFs.Isuspectthatmanyreadersareinasimilarposition.5YoucandownloadacomputerapplicationcalledFreedomwhichallowsyoutoreadinpeacebycuttingoffyourInternetconnection.OrifyouwanttoavoidbeingdisturbedbytheInternetyoucouldalwaysdownloadofflinereaderInstapaperforyouriPhone.Ifyou'restillreadingmyarticlethatisslowreading. A.TheInternetisprobablypartoftheproblem. B.Nowsomecampaignsareadvocatingslowreading. C.Thesearethetwofindingsfromtherecentresearchprojects. D.Butifyoujustoccasionallywanttoreadmoreslowlyhelpisathand. E.Someofthemhavesuggestedturningtheircomputersoffforonedayaweek. F.Slowreadingcanhelpconnectareadertoneighborhoodandbecomepopular. G.BecauseoftheInternetwehavebecomeverygoodatcollectinginformation.
1分Althoughshehassparednoeffortsonlearningshestillcouldn'tliveuptoherparents'e.
15分MemorizinghundredsofEnglishwords1bealwaysabigheadacheforstudents.Whynotlet2amazingappBaicizhanhelpyou?Firstofalltheapphelpsyoudivideyourworkintodailytasks.3youhavechosenthevocabularylistandanenddatetheappthenquicklytellsyouhowmanywordsyouneedtolearneveryday.Forexampleyoucanspendjust10minutes4memorize15wordseveryday.Doesn'tthatsoundmuch5easythantryingtodoeverythingatonce?That'snotall﹣itcanalsobemuchfun.Thelearningprocessislikeplayingaguessinggame.Instead6justshowingtheChineseandEnglish7meaningofanewwordtheappasksyoutofirstchoosethecorrectpicturefromfour8baseonanEnglishdescription.Thishelpsyoumemorizethewords9clear.AndalloftheEnglishisreadbynativespeakers.Youcanalsolistento10itEnglishwordsradiofeaturewhileyou'rewalking.
2分Thethatitisdifficulttogetnewideasacceptedunlesstheyare.
1分Theemploymentisincreasingsharplywiththebusinessbandmakingmoneyisnotthatdifficult.
15分BorninItalyGalileoGalileiwasaTuscanastronomerphilosopherandphysicist.Heiscloselyassociatedwiththe61sciencerevolution.Forhisgreat62achievementhehasbeenreferredtoasthefatherofmodemastronomy.TheworkofGalileo63considertobeasignificantbreakfromthatofAristotle.InadditionhisconflictwiththeRomanCatholicChurchistakenas64majorearlyexampleoftheconflictofauthorityandfreedomofthoughtparticularlywithscienceinWesternsociety.Hewasaman65experimented﹣neverdidhetakeanythingforgranted.Insteadhedespised蔑视theprejudicesandbooklearningoftheAristoteliansanddrewhisconclusion66fear.Hehadbeenthefirst67turnatelescopetotheskyandhehadseenthereevidenceenoughtooverthrowAristotleandPtolemytogether.AlthoughGalileofounditdifficulttomakepeople68convinceofhistheorieshestillstuck69hisviews.Hisobservationsshowedthetheorythattheearth70movearoundtheSunwasright.Itwasonlymanyyearslaterthattheworldrecognizedhisgreatness.
1分What'stheuseoftheoreticalknowledgethathasnopapplication?
已知mn是两条不同的直线αβ是两个不同的平面则下列命题中正确的是
1分Theboystoodontheplaygroundhoverwhethertojointhegameornotandafraidofbeingturneddown.
2分Wehavefoundhumanandanimalbonesinthosecaveshigherupthehillaswellastoolsandotherobjects.Sowethinkitistheylivedinthesecaves.
8分Itwasoneofthehottestdaysofthedryseason.Wehadnotseenraininalmostamonth.Thecropsweredying.Cowshadstoppedgivingmilk.Thestreamswerelonggonebackintotheearth.Ifwedidn'tseesomerainsoonwewouldloseeverything. IwasinthekitchenmakinglunchformyhusbandandhisbrotherswhenIsawmysix﹣year﹣oldsonBillywalkingtowardthewoods.Hewasobviouslywalkingwithagreateffort…tryingtobeasstillaspossible.Minutesafterhedisappearedintothewoodshecamerunningoutagaintowardthehouse. Momentslaterhoweverhewasonceagainwalkinginthatslowpurposefullongsteptowardthewoods.Thisactivitywentonforoveranhourwalkingverycarefullytothewoodsthenrunningbacktothehouse.Finallymycuriositygotthebestofme.Iquietlywalkedoutofthehouseandfollowedhimonhisjourney. Hewascuppingbothhandsinfrontofhimashewalkedbeingverycarefulnottospill洒出thewaterheheldinthem.Branchesandthornsslappedhislittlefacebuthedidnottrytoavoidthem.Hehadamuchgreaterpurpose.AsIlookedathimsecretlyIsawthemostamazingsite. Severallargedeerappearedthreateninginfrontofhim.ButBillywalkedrightuptothem.Ialmostscreamedforhimtogetaway.AndIsawababydeerlyingonthegroundobviouslysufferingfromheavylossofwaterandheatexhaustionliftitsheadwithgreatefforttolapupthewatercuppedinmybeautifulboy'shand. IstoodontheedgeofthewoodswatchingthemostbeautifulheartIhaveeverknownworkingsohardtosavealife.Asthetearsthatrolleddownmyfacebegantohitthegroundtheyweresuddenlyjoinedbyotherdrops…andmoredrops…andmore.Ilookedupatthesky.ItwasasifGodhimselfwascryingwithpride. 21.Whydidtheauthorfollowherson? A.Becausetheremightbedanger. B.Becausehersonwasdoingagooddeed. C.Becauseshewascurious. D.Becausesheintendedtohelp. 22.WhichofthefollowingstatementsisNOTtrueaccordingtothepassage? A.Rainwasingreatneedatthetime. B.Billycarriedwaterwithhissmallhands. C.Therewerefewtreesinthewoods. D.Billywalkedintothewoodsmanytimes. 23.Whichisthecorrectorderofthedevelopmentofthestory? ①Theauthorwasmovedtotears. ②Billyfedthewatertothebabydeer. ③Billywalkedtowardsthelargedeer. ④Itbegantorain. ⑤TheauthorfollowedBillyintothewoods. A.⑤③②①④ B.③②⑤①④ C.④①③②⑤ D.⑤②①③④ 24.Whichofthefollowingisthebesttitleforthepassage? A.ImportanceofWater B.TheWaterofLife C.HowtoSaveAnimals D.AnimalsinDanger.
10分 TheArtofSlowReading IfyouarereadingthisarticleinprintchancesarethatyouwillonlygetthroughhalfofwhatIhavewritten.Andifyouarereadingthisonlineyoumaynotevenfinishafifth.1Theysuggestthatmanyofusnolongerhavetheconcentrationtoreadarticlesthroughtotheirconclusion. Soarewegettingstupider?Actuallyouronlinehabitsaredamagingthementalpowerweneedtoprocessandunderstandtextualinformation.Round﹣the﹣clocknewsmakesusreadfromonearticletothenextwithoutnecessarilyengagingfullywithanyofthecontent.OurreadingisfrequentlystoppedbythenoiseofthelatestemailandwearenowabsorbingshortburstsofwordsonTwitterandFacebookmoreregularlythanlongertexts.2Butwearegraduallyforgettinghowtositbackthinkcarefullyandrelateallthefactstoeachother. 3Adesperatebunchofacademicswantustotakeourtimewhilereadingandre﹣reading.Theyaskustoswitchoffourcomputerseverysooftenandrediscoverboththejoyofpersonalengagementwithprintedtextsandtheabilitytoprocessthemfully.What'stobedonethen?Mostslowreadersrealizethattotalrejectionofthewebisextremelyunrealistic.Theyfeelthatgetawayfromtechnologyforawhileistheanswer.4 PersonallyI'mnotsurewhetherIcouldevergoofflineforlong.EvenwhilewritingthisarticleIamswitchingconstantlybetweensitesskimmingtoooftenabsorbingtoolittle.Internetreadinghasbecometoorootedinmydailylifeformetochange.IreadessaysandarticlesnotinhardcopybutasPDFs.Isuspectthatmanyreadersareinasimilarposition.5YoucandownloadacomputerapplicationcalledFreedomwhichallowsyoutoreadinpeacebycuttingoffyourInternetconnection.OrifyouwanttoavoidbeingdisturbedbytheInternetyoucouldalwaysdownloadofflinereaderInstapaperforyouriPhone.Ifyou'restillreadingmyarticlethatisslowreading. A.TheInternetisprobablypartoftheproblem. B.Nowsomecampaignsareadvocatingslowreading. C.Butifyoujustoccasionallywanttoreadmoreslowlyhelpisathand. D.Thesearethetwofindingsfromtherecentresearchprojects. E.BecauseoftheInternetwehavebecomeverygoodatcollectinginformation. F.Slowreadingcanhelpconnectareadertoneighborhoodandbecomepopular. G.Someofthemhavesuggestedturningtheircomputersoffforonedayaweek.
8分GrowingupinWyomingeverydaylifewasanadventure﹣Ispentmytimecampingandexploringmountains.WhenIwaslittlemymombecamethestate'sfirstfemaleU.S.Marshall.I'llneverforgethowthelocalnewspaperpraisedherforhersuccessinafieldthat'straditionallyrunbymen.UnderherinfluenceImadeupmymindtoachievesomethinggreat.NowI'vebecomefamousforsailingasportoftenconsideredaman'sworld. Sailingisconsideredahard﹣to﹣break﹣intosport.Andgenerallythereareonlytwowaystogetintoit﹣eitherthroughastrictsailingeducationthatleadstoexperienceorbygrowinguponthewaterandracingintheOlympics.MostofmyteammatesbecameprofessionalsailorsinoneofthesetwowaysbutIskippedboth. Inthesummerof2008IwenttoSt.Croixthroughacollegeinternship实习programfocusingoneducatinglocalsaboutHIVandAIDs.ThereIdiscoveredmyloveforsailing.ThenSCAaglobalhygiene卫生保健companymadethedecisiontosupportanall﹣femaleteamandwhentheybeganacceptingapplicationsIknewitwasthechanceofalifetime.Imadeitmytasktobecomeapartoftheteam.EvenwhenitseemedliketherewerenopositionsleftInevergaveup. Afterastressfultwo﹣yearapplicationprocessIfinallygotthecall.ImovedtoLanzaroteintheCanaryIslandsandbegantrainingwiththeteamimmediately.TheprocesswasphysicallymentallyandemotionallyexhaustingbutIfinallyachievedmygoal.IsailedintheEverestofsailingwithonlysixyears'experience.Latertherewasanall﹣femaleteamcompetingandIwasluckyenoughtobeapartofit. Aswomenweneedtoapproachourdreamsasifwedeservetoachievethemasmuchasmenbecausewedo.Thereareplentyofprofessionsincludingsailinginwhichwomenareabsentorhaveaminorpresence﹣butthat'snotbecausetheyshouldn'tbethere.Weneedtopushtheboundariesandfocusonobtainingourgoalsandpassionsnomatterhowunobtainableandchallengingtheymayseem. 1WhydoestheauthormentionhermotherinParagraph1? A.Tocomparewithhermother. B.Todescribewomen'sstruggles. C.Toanalyzehermother'ssuccess. D.Toshowhermother'sinfluenceonher. 2whatdoestheunderlinedwordbothinParagraph2probablyreferto? A.Twotraditionalwaystobecomeprofessionalsailors. B.Twoimportantpersonsintheauthor'slife. C.Twobasicstagesofbeingasailor. D.Twofamousprofessionalsailors. 3Whatisthecorrectorderofthefollowingevents? a.Ibegantrainingwiththesailingteam. b.Iattendedacollegeinternshipprogram. c.Itookpartincompetinginanall﹣femaleteam. d.Idiscoveredmyloveforsailingasawoman. A.b﹣d﹣a﹣c B.d﹣a﹣c﹣b C.a﹣c﹣d﹣b D.a﹣d﹣c﹣b 4Whichcanbestdescribetheauthor? A.Humorous. B.Generous. C.Pessimistic. D.Determined.
10分Identitytheftisarousingincreasingattentionfromthepublic.36Whenyouridentityisstolenthethiefoftendoesfraud诈骗withthat.Hemaygetacreditcardinyournameandspenditcarelesslywithoutpayingthebills.Hemaygetadriver'slicenseinyournameandyouwillbeheldresponsibleforthetrafficaccidentshecauses. WhyisidentitytheftbecomingSOcommon?37AndthewealthofprivatedetailspeoplepostonsocialnetworkssuchasFacebookalsomakesiteasierforidentitythievestoobtainprivateinformation. Manypeoplearenotawareoftheproblemscausedbythecrime.38 39ThisiswhyitisofimportancethateverypersonshouldbecomecautiouswhenusingtheInternet.Thefollowingtipsmaypreventyoufromidentitytheft. Firstmakesureyourcomputerhasanupdatedanti﹣virusandfirewallsysteminstalled.Second40Yourdateofbirthnamesofschoolsattendedphonenumberorthenamesofyourparentsareoftenrequiredtoverifyanidentityandthievescanusethisinformationtoo.Lastbutnotleastcreatecomplexpasswordsusingacombinationofnumbersandkeyboardsymbolsandchangeyourpasswordsonaregularbasis. A.AgatewayisofferedfortheidentitytheftbythepopularityoftheInternetandcomputers. B.Giveawayyourprivateinformationonsocialnetworkingsites谢也theutmostcaution. C.Thereisonesolutiontosolvetheproblem. D.Thisisacrimeinwhichyourprivateinformationisstolenbysomeoneandisusedinallillegalway. E.Theywakeupfromtheircarefreeattitudeonlywhentheybecomeavictimandsufferthedamagescausedbythecrime. F.Thereisnocureforidentitytheftexceptprevention. G.Theymayborrowmoneyfromthebankinyourname.
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