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向硫酸铜溶液中加入一定量的镁粉，完全反应后过滤，得滤渣和蓝色滤液，下列说法正确的是（ ）
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向含有硫酸铜的废液中加入一定量的铁粉充分反应后过滤向滤渣中加入稀盐酸有气泡产生有关判断正确的是
滤渣中一定有铁．可能有铜
滤渣中一定有铁，没有铜
滤液中一定有硫酸亚铁，硫酸铜
滤液中一定有硫酸亚铁，没有硫酸铜
某工厂从硫酸铜废液中回收金属铜.将一定量的铁粉加入到硫酸铜废液中充分反应后过滤向滤渣中加入稀盐酸无气
2.5分为防止水体污染并回收某种金属某工厂向含有硫酸铜的废水中加入一定量的铁粉充分反应后过滤洗涤干
铁和硫酸铜
铁和铜
铜
铁
将一定量的锌粉加入到硫酸亚铁硫酸铜和硫酸镁的混合溶液中过一段时间后过滤向滤渣中加入稀盐酸有气泡产生则
①④⑤
②③④⑤
②③④
②④
向硫酸亚铁和硫酸铜的溶液中加入一定量的锌粒充分反应后过滤向滤渣中加入稀盐酸有气泡冒出根据上述现象得
滤渣中只有铜
滤渣中一定有铁
滤渣中一定有锌
滤渣中一定有铜．铁．锌
向硫酸铜溶液中加入一定量的镁粉完全反应后过滤得滤渣和蓝色滤液下列说法正确的是
滤渣中一定有铜,可能有镁
滤液中只有硫酸镁
向滤渣中滴加稀盐酸，无气泡产生
滤液中只有硫酸铜
为防止水体污染并回收某种金属某工厂向含有硫酸铜的废水中加入一定量的铁粉充分反应后过滤洗涤干燥得滤渣取
向硫酸亚铁和硫酸铜的溶液中加入一定量的锌粒充分反应后过滤向滤渣中加入稀盐酸有气泡冒出根据上述现象得
滤渣中一定有铁
铁滤渣中只有铜
滤渣中一定有锌
滤渣中一定有铜．铁．锌
向某硫酸铜溶液中放入一定量的铝粉和铁粉的混合物充分反应后过滤向滤渣中加入稀盐酸有气泡产生则滤液中一定
向硫酸亚铁和硫酸铜的溶液中加入一定量的金属镁充分反应后过滤向滤渣中加入稀盐酸有气泡冒出根据上述现象
滤渣中一定有铁
滤渣中只有铜
滤渣中一定有镁
滤渣中一定有铜．铁．镁
将一定量的锌粉加入到硫酸亚铁硫酸铜和硫酸镁的混合溶液中过一段时间后过滤向滤渣中加入稀盐酸有气泡产生关
1个
2个
3个
4个
在由CuCl2ZnCl2组成的混合溶液中加入一定量的镁粉充分反应后过滤向滤渣中加入稀盐酸有无色气体生
滤液一定是无色的
滤渣中一定含有单质锌
滤渣中一定含有单质铜
加入的镁粉一定是过量的
将一定量的锌粉加入到硫酸镁和硫酸铜的混合溶液中反应一段时间后过滤得无色滤液和滤渣滤渣的成分可能是
锌
镁、铜
锌、铜
镁、锌、铜
某实验室废液中含有稀硫酸硫酸亚铁和硫酸铜若向其中加入一定量的锌充分反应后过滤向滤渣中加入盐酸有气泡产
将一定量的锌粉加入到硫酸镁和硫酸铜的混合溶液中反应一段时间后过滤得无色滤液和滤渣．滤渣的成分可能是
将一定量的锌粉加入硫酸亚铁硫酸铜和硫酸镁的混合溶液中过一段时间后过滤向滤渣中加入稀盐酸有气泡产生则下
①④⑤
②④
②③④
②③④⑤
向硫酸铜的溶液中加入一定量的铁充分反应后过滤向滤渣中加入稀盐酸有气泡冒出根据上述现象得出的结论正确
滤渣中一定有铁
滤渣中只有铜
滤液中有硫酸铜
滤液有两种溶质
为防止水体污染并回收某种金属某工厂向含有硫酸铜的废水中加入一定量的铁粉充分反应后过滤洗涤干燥得滤渣
铁和硫酸铜
铁和铜
铜
铁
向硫酸亚铁和硫酸铜的混合溶液中加入一定量的锌粒充分反应后过滤向滤渣中加入稀盐酸有气泡冒出．根据上述现
滤渣中只有铜
滤渣中一定有铁
滤渣中一定有锌
滤渣中一定有铜．铁．锌
将一定量的锌粉加入到硫酸铜和硫酸镁的混合溶液中过一段时间后过滤向滤渣中加稀盐酸有气泡产生则下列叙述正
①④⑤
②③④⑤
②③④
①④
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下列说法不正确的是
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下列用电器利用电流的热效应工作的是
解不等式并把它的解集在数轴上表示出来． ﹣＞﹣3
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^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处多着从第11处起不计分. LastAugustIwenttoSacramentoUSA.I'dbelookingforwardtoitforagesbutintheenditturned outtobetheworstholidaysofmylife.Mymotherwasbornherebutshehadn'tbeenbackforvisitfor twentyyearssoshehaddecidedtocomewithoutme.WhenourplanetoucheddownIlookedoutof thewindowincuriositybutshockedtofinditwaspouringdown!Mymumsaidnottoworry astheweathercouldchangeveryquick.InallwespenttwoweeksinSacramento.Believeitornot thesundoesn'tcomeoutevenonce!Insteadofgoingtothebeachorsightseeingwespentmostdays visitingmuseumsandwentshopping.ItcertainlywasnottheholidaythatIhadexpectedfor.
8分AreportbytheUS'OpenSyllabusProjectfoundthatthemostreadbooksamongUScollegestudentsinthepastyearwerethelikesofTheRepublicbyancientGreekphilosopherPlatoandTheClashofCivilizationsbyUSpoliticalscientistSamuelHuntington.AndaccordingtoreportsreleasedbyChinesecollegelibrariesthemostpopularbooksamongChinesestudentsarenovelslikeJourneyUndertheMidnightSunbyJapanesewriterKeigoHigashinoandDemi﹣GodsandSemi﹣Devils天龙八部byChineseauthorLouisCha. ThisisconsideredbymanytobeoneofthereasonswhyChinesestudentsaresometimesnotasgoodatcriticalthinkingorobservingglobalperspectivesasUSstudents﹣theyreadtoomanybestsellernovels. ByreadingtextsinsocialstudiesscienceandotherdisciplinesstudentsbuildafoundationofknowledgeinthesefieldsthatwillalsogivethemthebackgroundtobebetterreadersinallareasRobertPondisciovicepresidentoftheCoreKnowledgeFoundationintheUStoldTheWashingtonPost. AccordingtoChinaYouthDailythereareusuallyfivestageswhenitcomestoreadingwithpopularnovelsatthebottom.Moreadvancedreadersnormallygoontoreadclassicfictionalliteraturehistoryandphilosophyorbookswithcriticalideas.Thefifthstageinvolvesstudentsmakingtheirownreadinglistsbasedontheideological意识形态的systemstheyhavebuiltthroughouttheyears. Wespendhoursdaysorevenweeksonabooksoit'sonlynaturalthatwewanttolearnsomethingusefulinreturnforourefforts.Manyseereadingasaninvestmentinthemselves. Butthispracticalviewofliteratureandthethoughtthathistoryandphilosophybooksaresuperiortonovelsisnotagreedbyeveryone.Afterallwhattheyofferaretwodifferentkindsofsatisfaction.Whiletheformerprovidesknowledgethelatterbringssentimental情感的experiences.FictionandpoetryaremedicinesUKwriterJeanetteWintersononcewrote.Whattheyhealistherupture裂痕realitymakesontheimagination. 24.Thepurposeofparagraphoneisto. A.comparethepopularbooksbetweentheUSandChinesestudents. B.introducethedifferentdiscoveriesfromChinaandtheUS. C.analyzetheculturaldifferencesofthetwocountries. D.statewhyChinesestudentsaresometimesnotgoodatcriticalthinking 25.Toknowsomethingineachareastudentsshouldread. A.famousnovelswhichhaswonmanyprizes B.textsinsocialstudiesandotherdisciplines C.modernmagazineswhichhavegainedgreatpopularity D.sciencefictionsinvolvingknowledgeinmanyareas 26.AccordingtoChinaYouthDailywhichisthehigheststagewhilereading? A.Booksbasedonthereaders'thought. B.Classicfictionalliterature. C.Bookswithcriticalideas. D.Popularnovels. 27.Whatcanweinferfromthelasttwoparagraphs? A.Historybooksaresuperiortonovels. B.JeanetteWintersonthoughtfictionandpoetryarealsouseful. C.Philosophybookshelpthereadersgetemotionalexperience. D.Thewriterpreferstoreadthehistoricalandscientificbooks.
查询资料可知某地区冬季太阳能集热管每平方米面积上平均每天可接收的太阳能是1.7×107J．用300m2集热管接收的太阳能代替煤煤的热值是3×107J/kg．每天300m2集热管接收的太阳能是J．平均一个星期可节约煤t煤完全燃烧．
如图甲所示是小明在做“用伏安法测量某定值电阻R的阻值”的实验电路图 1实验前滑动变阻器的滑片应置于填“最左”或“最右”端其目的是为了． 2闭合开关移动滑动变阻器滑片P发现电压表始终无示数电流表有示数其原因可能是填字母 A滑动变阻器断路BR断路CR短路 3排除故障后当电压表的示数如图乙所示时电流表的示数如图丙所示则定值电阻的阻值是Ω． 4通常情况下要进行多次测量并取平均值其目的是为了．
10分TipsforStayingSharpIt'snotabnormaltofeeloutofitfromtimetotimeorperhapsyou'refeelingabitsluggish迟钝的whenitcomestorememberingthings.Ifyou'reworriedaboutyourforgetfulnesstryoutthesefivetipstostaysharp.36You'veprobablyheardthetermyouarewhatyoueat.Ifyoudecidetoeatsugaryfoodsthatareheavywithfatsthenexpecttofeellazyandhavenoenergy.Butifyoudecidetoeatfruitsvegetablesandmakeotherhealthyeatingdecisionsyou'11findthatyou'refullofenergy.NeverstoplearningChallengeyourselfconstantly﹣whetheritispuzzlesreadingcookingorothertasksthatwillkeepyourmindworking.Ifyourmindisalwayslearningnewthingsandactiveyou'11realizethatit'smucheasierforyoutolearnnewthingsandtofunction.37StayfitBeingingoodhealthandstayinginshapeisabigpartofstayingsharp.38Ifyouchoosetobelazythenyourbodyisnotgoingtogiveyoutheenergythatrequiresrememberingthingsandcompletingtasks.Howeverifyouputforththeeffortintobeinghealthythenyourbodywillexpel释放theenergyyouneedtoachieveyourgoals.EnsureenoughsleepBesuretogetthenecessaryamountofsleepthatyourbodyneedstofunctiononadailybasis.39Italsohelpsyourbodybuildupanenergyreservesoyoucanimproveyourabilitytofocusandavoiddistractions.Socializemore40Socialinteractionwillhelpyoudevelopmultitaskingproblemsolvingandotherskillsthatarenecessaryinlifetokeepyourmindsharp.A.Feedyourbrain.B.Avoideatingtoomuch.C.Yourbodywillonlygiveyouwhatyouputintoit.D.Lackofsleepcontributestotirednessandslowreaction.E.Conversationsrequireindividualstostayawareandactive.F.Accordingtostudiessleephelpsstrengthenandrecoveryourmemories.G.Rememberyourbrainisamuscleandifyouwanttogetthemostoutofityoumustuseit.
已知抛物线y＝﹣x2+bx+c的对称轴为直线x＝1其图象与x轴相交于AB两点与y轴相交于点C03． 1求bc的值 2直线1与x轴相交于点P． ①如图1若l∥y轴且与线段AC及抛物线分别相交于点EF点C关于直线x＝1的对称点为点D求四边形CEDF面积的最大值 ②如图2若直线1与线段BC相交于点Q当△PCQ∽△CAP时求直线1的表达式．
小明家电能表上个月底的示数为这个月底的示数如图所示可知他家本月电能表的表盘转了圈．他家最多能接入总功率为W的用电器．
25分假定你是李华学校将于5月底开展英语阅读周活动请给你的英国笔友Peter写信向他说明该活动的目的和意义并请他推荐适合高中生阅读的英文书籍. 注意: 1.词数100左右; 2.可适当增加细节以使行文连贯. .
8分Giantkitescouldsupplygreenenergywithouttheneedfortaxpayer﹣fundedsubsidies津贴withinyears.KitePowerSolutionsexpectstoopentheU.K.'sfirstkitepowerplantthisyearinScotland.Ithopestolaunchthetechnologyonshoreandatseabuildingsystemswiththecapacitytoproducehundredsofmegawattsofpowerwithinthedecade.Thecompanybelievesthetechnologycouldreducethecostofwindenergy.Anditpredictedthatkitepowerwouldcostsolittlethatdevelopingcountrieswouldbemorelikelytouseittofreethemselvesoffpollutingcarbon﹣heavyenergysources.AspokesmanAinsworthforKitePowerSolutionssaidthetechnologycoulddecreasethecostofoffshorewindenergymeetingtheneedforgovernments'effortstoreducecarbonemissions排放.Hesaidthetechnologywaseasytofixandmaintainmeaningitcouldbeusedindeepwateronfloatingstructuresfarfromshore.Ifwedothatitopensupaglobaldeepwateroffshorewindmarkethesaid.ThetechnologycouldcontrolrisingCO2emissionsinthedevelopingworldwheretheneedtosavemoneyforcespeopletoadopttopollutingtechnologiessuchasdiesel.ThecompanyhastestedthetechnologyonasmallscaleinEssexandwillmoveitsheadquarterstoGlasgowtopreparefornextyear'slaunch.Ithaswonplanningpermissionfora500KWdemonstrationsystem.TheU.K.'sgreenenergytradebodyRenewableU.K.welcomedthetechnologybutwarneditwasnotasilverbullet.ThedeputychiefexecutiveMarSmithsaid:Thisisanambitiousprojecttodevelopwindpoweratextraordinaryheightsanditshowsthelevelofnewideaswithintherenewableindustry.Kitepowerisatanearlystageofdevelopmentanditwilltaketimetoseehowthetechnologyprogresses.Anywaywewillneedawiderangeofenergysourcesinthefuturetomeetourneedsinanenvironmentallyfriendlyway.28.Whatisthebiggestadvantageofkitepower?A.Itslowcost.B.Itswideuse.C.Itsgreatflexibility.D.Itshighquality.29.IntheeyesofAinsworthkitepowercan.A.getridofairpollutionB.beconvenienttouseC.helpexploretheoceanD.dealwithwatershortage30.Whatdoestheunderlinedphraseasilverbulletmean?A.ascientificideaB.apracticalwayC.aquicksolutionD.asuitablechoice31.Whatistheauthor'spurposeinwritingthepassage?A.Toargueforcleanerenergies.B.Tointroduceanewwaytogetenergy.C.Toadvertiseagreatenergycompany.D.Tocomparedifferentenergyresources.
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