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（1）某实验小组要对未知电阻Rx进行测量．他们先用多用电表欧姆档进行粗测，若多用电表的电阻档有三个倍率，先用×10档测量电阻Rx时，操作步骤正确，发现表头指针向右偏转角度过大，为了较准确地进行测量，...
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高三下学期物理《》真题及答案
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为了较为精确测量某一定值电阻的阻值兴趣小组先用多用电表进行粗测后用伏安法精确测量.现准备了以下器材A
某同学测量一只未知阻值的电阻.1他先用多用电表进行测量按照正确的步骤操作后测量的结果如图2-53甲所
某同学测量一只未知阻值的电阻.1他先用多用电表进行测量按照正确的步骤操作后测量的结果如图甲所示请你读
在用多用电表测电阻电流和电压的实验中1多选题用多用电测电流或电阻的过程中A.在测量电阻时更换倍率后必
在用多用电表测电阻电流和电压的实验中1多选题用多用电测电流或电阻的过程中A.在测量电阻时更换倍率后必
为确定某电子元件的特性做如下测量用多用电表的欧姆挡测量该元件的电阻选用×100倍率的电阻挡测量发现多
9分某同学测量一只未知阻值的电阻.①他先用多用电表进行测量按照正确的步骤操作后测量的结果如图14甲所
某同学利用多用电表测量一个未知电阻的阻值由于第一次选择的欧姆挡×10指针位置如图线①所示现将旋钮调至
某同学测量一只未知阻值的电阻.他先用多用电表进行测量按照正确的步骤操作后测量的结果如图所示.为了使多
某研究性学习小组的成员要测量某一电阻Rx较精确的阻值他们先用多用电表粗测电阻Rx所用多用电表的欧姆挡
某同学测量一只未知阻值的电阻他先用多用电表进行测量按照正确的步骤操作后测量的结果如图所示为了使多用电
换×100挡，测未知阻值的电阻
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9分某同学测量一只未知阻值的电阻.①他先用多用电表进行测量按照正确的步骤操作后测量的结果如图14甲所
某同学先用多用电表×10档对未知电阻进行测量按照正确的步骤操作后发现指针偏转角度过小为了使多用电表测
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在实验室内测定金属电阻率的实验中提供的器材除多用电表螺旋测微器米尺开关和若干导线外还有A.待测粗细均
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Agardenthat'sjustrightforyouHaveyouevervisitedagardenthatseemedjustrightforyouwheretheatmosphereofthegardenappearedtototalmorethanthesum总和ofitsparts?36.Butitdoesn'thappenbyaccident.Itstartswithlookinginsideyourselfandunderstandingwhoyouarewithrespecttothenaturalworldandhowyouapproachthegardeningprocess.●37Somepeoplemaythinkthatagardenisnomorethanplantsflowerspatternsandmassesofcolor.Othersareconcernedaboutusinggardeningmethodsthatrequirelesswaterandfewerfertilizers肥料.38.Howeverthereareanumberofotherreasonsthatmightexplainwhyyouwanttogarden.Oneofthemcomesfromourearliestyears.●Recall回忆yourchildhoodmemoriesOurmodelofwhatagardenshouldbeoftengoesbacktochildhood.Grandma'srosegardenandDad'svegetablegardenmightbegoodorbadbutthat'snotwhat'simportant.39﹣﹣howbeinginthosegardensmadeusfeel.Ifyou'dliketobuildapowerfulbondwithyourgardenstartbytakingsometimetorecallthegardensofyouryouth.40thengooutsideandworkoutaplantotranslateyourchildhoodmemoriesintoyourgrown﹣upgarden.Havefun.A.KnowwhyyougardenB.FindagoodplaceforyourowngardenC.It'sourexperienceofthegardenthatmattersD.It'sdelightfultoseesomanybeautifulflowersE.StillothersmaysimplyenjoybeingoutdoorsandclosetoplantsF.YoucanproducethatkindofmagicalqualityinyourowngardentooG.Foreachofthosegardenswriterdownthestrongestmemoryyouhave.
Readingcanbeasocialactivity.Thinkofthepeoplewhobelongtobookgroups.Theychoosebookstoreadandthenmeettodiscussthem.NowthewebsiteBookCrossing.comBookCrossing.comturnsthepageonthetraditionalideaofabookgroup.Membersgoonthesiteandregisterthebookstheyownandwouldliketoshare.BookCrossingprovidesanidentificationnumbertostickinsidethebook.Thenthepersonleavesitinapublicplacehopingthatthebookwillhaveanadventuretravelingfarandwidewitheachnewreaderwhofindsit.BrucePedersonthemanagingdirectorofBookCrossingsays'Thetwothingsthatchangeyourlifearethepeopleyoumeetandbooksyouread.BookCrossingcombinesboth.'Membersleavebooksonparkbenchesandbusesintrainstationsandcoffeeshops.Whoeverfindstheirbookwillgotothesiteandrecordwheretheyfoundit.Peoplewhofindabookcanalsoleaveajournalentrydescribingwhattheythoughtofit.E﹣mailsarethensenttotheBookCrossingtokeepthemupdatedaboutwheretheirbookshavebeenfound.Brucepetersonsaystheideaisforpeoplenottobeselfishbykeepingabooktogatherdustonashelfathome.BookCrossingispartofatrendamongpeoplewhowanttogetbacktothe'real'andnotthevirtual虚拟.Thesitenowhasmorethanonemillionmembersinmorethanonehundredthirty﹣fivecountries.29.Whydoestheauthormentionbookgroupsinthefirstparagraph?A.Toexplainwhattheyare.B.TointroduceBookCrossing.C.Tostresstheimportanceofreading.D.Toencouragereaderstosharetheirideas.30.Whatdoestheunderlinedword'it'inParagraph2referto?A.Thebook.B.Anadventure.C.Apublicplace.D.Theidentificationnumber.31.WhatwillaBookCrosserdowithabookafterreadingit?A.Meetotherreaderstodiscussit.B.Keepitsafeinhisbookcase.C.Passitontoanotherreader.D.Mailitbacktoitsowner.32.Whatisthebesttitleforthetext?A.OnlineReadingAVirtualTourB.ElectronicBooksAnewTrendC.ABookGroupBringsTraditionBackD.AWebsiteLinksPeoplethroughBooks.
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.
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FiveyearsagowhenItaughtartataschoolinSeattleIusedTinkertoysasatestatthebeginningofatermtofindoutsomethingaboutmystudents.IputasmallsetofTinkertoysinfrontofeachstudentandsaid'MakesomethingoutoftheTinkertoys.Youhave45minutestoday﹣and45minuteseachdayfortherestoftheweek.'Afewstudentshesitatedtostart.Theywaitedtoseetherestoftheclasswoulddo.Severalotherscheckedtheinstructionsandmadesomethingaccordingtooneofthemodelplansprovided.Anothergroupbuiltsomethingoutoftheirownimaginations.OnceIhadaboywhoworkedexperimentallywithTinkertoysinhisfreetime.Hisconstructionsfilledashelfintheartclassroomandagoodpartofhisbedroomathome.Iwasdelightedatthepresenceofsuchastudent.Herewasanexceptionallycreativemindatwork.HispresencemeantthatIhadanunexpectedteachingassistantinclasswhosecreativitywouldinfect感染otherstudents.Encouragingthiskindofthinkinghasadownside.Irantheriskoflosingthosestudentswhohadadifferentstyleofthinking.Withoutfailonewoulddeclare'ButI'mjustnotcreative.''Doyoudreamatnightwhenyou'reasleep?''Ohsure.''Sotellmeoneofyourmostinterestingdreams.'Thestudentwouldtellsomethingwildlyimaginative.Flyingintheskyorinatimemachineorgrowingthreeheads.'That'sprettycreative.Whodoesthatforyou?''Nobody.Idoit.''Really﹣atnightwhenyou'reasleep?''Sure.''Trydoingitinthedaytimeinclassokay?'25.TheteacherusedTinkertoysinclassinorderto?A.knowmoreaboutthestudentsB.makethelessonsmoreexcitingC.raisethestudents'interestinartD.teachthestudentsabouttoydesign26.WhatdoweknowabouttheboymentionedinParagraph3?A.Helikedtohelphisteacher.B.Hepreferredtostudyalone.C.Hewasactiveinclass.D.Hewasimaginative.27.Whatdoestheunderlinedword'downside'inParagraph4probablymean?A.Mistake.B.Drawback.C.Difficulty.D.Burden.28.Whydidtheteacheraskthestudentstotalkabouttheirdreams?A.Tohelpthemtoseetheircreativity.B.Tofindoutabouttheirsleepinghabits.C.Tohelpthemtoimprovetheirmemory.D.Tofindoutabouttheirwaysofthinking.
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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Λ并在其下面写出该加的词. 删除把多余的词用斜线﹨划掉. 删除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处多者从第11处起不计分. Thesummerholidayiscoming.MyclassmatesandIaretalkingabouthowtododuringtheholiday.Wecanchosebetweenstayingathomeandtakeatrip.Ifwestayathomeitiscomfortablebutthereisnoneedtospendmoney.Butinthatcasewewilllearnlittleaboutworld.Ifwegoonatripabroadwecanbroadenyouviewandgainknowledgeswecannotgetfrombooks.Someclassmatessuggestwecangotoplacesofinterestnearby.Ithoughtthatitisagoodidea.Itdoesnotcostmanyyetwecanstilllearnalot.
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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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Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable.Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished.Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy.Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout.
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10分Therelationshipbetweenexerciseandcancerhaslongbothintriguedandpuzzledoncologistsandexercisephysiologists.Exerciseisstronglyassociatedwithloweredrisksformanytypesofcancer.Atthesametimeexerciseinvolvesbiologicalstresswhichtypicallyleadstoashort﹣termincreaseininflammation发炎whichcancontributetohigherrisksformanycancers.Nowanewstudyinmicemayoffersomecluesintotheexercise﹣cancerparadox.Itsuggeststhatexercisemaychangehowtheimmunesystemdealswithcancerbyboostingadrenaline肾上腺素certainimmunecellsandotherchemicalsthattogethercanreducetheseverityofcancerorfightitoffaltogether.TotrytobetterunderstandhowexercisecanbothelevateinflammationandsimultaneouslyprotectthebodyagainstcancerscientistsattheUniversityofCopenhageninDenmarkandotherinstitutionsdecidedtocloselyexaminewhathappensinsidemiceathighriskforthedisease.Soforthenewstudytheybeganbygatheringagroupofadultlabmice.Theseanimalsgenerallyliketorun.Thescientiststhenimplantedmelanoma黑素瘤skincancercellsintothemicebeforeprovidinghalfofthemwithrunningwheelsintheircageswhiletheotheranimalsremainedsedentary.Afterfourweeksfarfeweroftherunnershaddevelopedfull﹣blownmelanomathanthesedentarymiceandthosethathadbeendiagnosedwiththediseaseshowedfewerandsmallerlesions.Theydrewbloodfromboththeexercisingandsedentaryanimalsandcellsfromanytumorsinbothgroups.Asexpectedtheyfoundmuchhigherlevelsofthehormoneadrenalineinthebloodoftheexercisinganimalsespeciallyrightaftertheyhadbeenworkingoutonthewheelsbutalsoatothertimesoftheday.Thebodyreleasesadrenalineinresponsetoalmostanytypeofstressfulexperienceincludingexercise.Theyalsofoundhigherlevelsofinterleukin﹣6inthebloodoftherunners.Thisisasubstancethatisreleasedbyworkingmusclesandisbelievedtobothincreaseanddecreaseinflammationinthebodydependingonwhereandhowitgoestowork.Perhapsmostimportanttheyfoundmuchhighernumbersinthebloodstreamsofrunnersthaninthesedentarymiceofatypeofimmunecellnamednaturalkillercellsthatareknowntobestrongcancerfighters.Sothescientistsrepeatedtheiroriginalexperimentmultipletimesinducingcancerwhileallowingsomemicetorunandotherstosit.Insomeofthesefollow﹣upexperimentsthescientistsinjectedtherunnerswithasubstancethatblockedtheproductionofadrenalineandgavesedentaryanimalslargedosesofaddedadrenaline.Whattheynowfoundwasthatwhenrunningmicecouldnotproduceadrenalinetheydevelopedcanceratthesamerateasthesedentaryanimalswhilethesedentaryanimalsthathadbeeninjectedwithextraadrenalinefoughtofftheirtumorsbetterthanothersittingmice.Moreremarkablythescientistsdeterminedthatadrenalineseemedtobesendingbiochemicalsignalstosomeoftheanimals'IL﹣6cellsmakingthemphysiologicallymorealertsothatwhenatumorbegantodevelopintheaffectedanimalthoseIL﹣6cellsinturnactivatedthenaturalkillercellsinthebloodstreamandactuallydirectedthemtothetumorslikeminuteguidefish.Withtheseresults'weshowthatvoluntarywheelrunninginmicecanreducethegrowthoftumorsandwehaveidentifiedanexercise﹣dependentmobilizationofnaturalkillercellsastheunderlyingcauseofthisprotection'saidPernilleHojmanaresearcherattheUniversityofCopenhagenwhooversawthenewstudy.Itperhapsprovidesonemoreincentiveforustogetupandmove.1TherelationshipbetweenexerciseandcancerhaslongpuzzledoncologistsandexercisephysiologistsbecauseA.exerciseisstronglyassociatedwithloweredrisksformanytypesofcancer.B.exercisecanbothelevateinflammationwhichcancontributetohigherrisksformanycancersandmeanwhileprotectthebodyagainstcancer.C.exercisemaychangecanreducetheseverityofcancerorfightitoffaltogether.D.exercisecanleadtoashort﹣termincreaseininflammationwhichcancontributetoelevatedrisksformanycancers.2Inthefirstexperimentwhichoneisthemostimportantresultthescientistsfound?A.naturalkillercellsaremuchmoreinthebloodstreamsofrunnersthaninthesedentarymice.B.levelsofinterleukin﹣6arehigherinthebloodoftherunnersthaninthesedentarymice.C.exercisesuchasrunningseemedtohelpthemicefightagainstthecancer.D.adrenalinecanreducetheseverityofcancerorfightitoff.3Whatdoestheunderlinedword'sedentary'mean?A.runB.moveC.sitD.sleep4Inthefollow﹣upexperimentsthescientistsfound?A.thehormoneadrenalinehasmuchhigherlevelsinthebloodoftheexercisinganimals.B.howtheseelementsintherunners﹣theirincreasedadrenalineIL﹣6andnaturalkillerimmunecellsfightagainsttumor.C.interleukin﹣6canbothincreaseanddecreaseinflammationinthebodydependingonwhereandhowitgoestowork.D.whathappensinsidemiceathighriskforthedisease.5Accordingtothestudywecaninferthefundamentalsubstancetofightthecanceroffis.A.adrenalineB.interleukin﹣6C.naturalkillercellsD.genes
设集合A＝{124}B＝{x|x2﹣4x+m＝0}．若A∩B＝{1}则B＝
设ω＞0函数y＝sinωx++2的图象向右平移个单位后与原图象重合则ω的最小值是
某化学小组为了研究外界条件对化学反应速率的影响进行了如下实验 【实验原理】2KMnO4+5H2C2O4+3H2SO4═K2SO4+2MnSO4+10CO2↑+8H2O 【实验内容及记录】 请回答 1根据表中的实验数据可以得到的结论是． 2利用实验1中的数据计算用KMnO4表示的化学反应速率为． 3该小组同学根据经验绘制了nMn2+随时间变化的趋势如图1所示但有同学查阅已有的实验资料发现该实验过程中nMn2+随时间变化的实际趋势如图2所示． 该小组同学根据图2所示信息提出了新的假设并继续进行实验探究． ①该小组同学提出的假设是． ②请你帮助该小组同学完成实验方案并填写表中空白 ③若该小组同学提出的假设成立应观察到现象．
已知△ABC的面积是AB＝1则AC＝
AnewcollectionofphotosbringsanunsuccessfulAntarcticvoyagebacktolife.FrankHurley'spictureswouldbeoutstanding﹣﹣﹣﹣undoubtedlyfirst﹣ratephoto﹣journalism﹣﹣﹣iftheyhadbeenmadelastweek.Infacttheywereshotfrom1914through1916mostofthemafteradisastrousshipwreck海难byacameramanwhohadnoreasonableexpectationofsurvival.Manyoftheimageswerestoredinanicechestunderfreezingwaterinthedamagedwoodenship.TheshipwastheEnduranceasmalltightNorwegian﹣builtthree﹣masterthatwasintendedtotakeSirErnestShackletonandasmallcrewofseamenandscientists27meninalltothesouthernmostshoreofAntarctica'sWeddellSea.FromthatpointShackletonwantedtoforceapassagebydogsled雪橇acrossthecontinent.ThejourneywasintendedtoachievemorethanwhatCaptainRobertFalconScotthaddone.CaptainScotthadreachedtheSouthPoleearlyin1912buthaddiedwithhisfourcompanionsonthemarchback.AswriterCarolineAlexandermakesclearinherforcefulandwell﹣researchedstoryTheEnduranceadventuringwaseventhenathoroughlycommercialeffort.Scott'slastjourneycompletedasbelayinatentdyingofcoldandhungercaughttheworld'simaginationandafilmmadeinhishonordrewcrowds.ShackletonaonetimeBritishmerchant﹣navyofficerwhohadgottowithin100milesoftheSouthPolein1908startedabusinessbeforehis1914voyagetomakemoneyfrommovieandstillphotography.FrankHurleyaconfidentandgiftedAustralianphotographerwhoknewtheAntarcticwashiredtomaketheimagesmostofwhichhaveneverbeforebeenpublished.33.WhatdoweknowaboutthephotostakenbyHurley?A.TheyweremadelastweekB.TheyshowedunderseasceneriesC.TheywerefoundbyacameramanD.Theyrecordedadisastrousadventure34.WhoreachedtheSouthPolefirstaccordingtothetext?A.FrankHurleyB.ErnestShackletonC.RobertFalconScottD.CarolineAlexander35.WhatdoesAlexanderthinkwasthepurposeofthe1914voyage?A.ArtisticcreationB.ScientificresearchC.MoneymakingD.Treasurehunting.
如图所示装置工作时均与H2有关． ①图1所示装置中阳极的电极反应式为． ②图2所示装置中通入H2一极的电极反应式为． ③某同学按图3所示装置进行实验实验结束后将玻璃管内固体物质冷却后溶于稀硫酸充分反应后滴加KSCN溶液溶液不变红再滴入新制氯水溶液变为红色．该同学据此得出结论铁与水蒸气反应生成FeO和H2．该结论填“严密”或“不严密”你的理由是用离子方程式表示．
现有强酸甲溶液的pH＝1强酸乙溶液的pH＝2则酸甲与酸乙的物质的量浓度之比不可能的是
﹣﹣﹣CanIreallygetanapple6plusasarewardifIwinthecompetition? ﹣﹣﹣Absolutely!________. A.Sowillyou B.Italldepends C.Imeanit D.That'sallright
为了探究AgNO3的氧化性和热稳定性某化学兴趣小组设计了如下实验． Ⅰ．AgNO3的氧化性 将光亮的铁丝伸入AgNO3溶液中一段时间后将铁丝取出．为检验溶液中Fe的氧化产物将溶液中的Ag+除尽后进行了如下实验．可选用试剂①KSCN溶液②NaOH溶液③酸性KMnO4溶液④K3[FeCN6]溶液． 1请完成下表 【实验结论】Fe的氧化产物为Fe2+和Fe3+ Ⅱ．AgNO3的热稳定性 用如图所示的实验装置A加热固体产生红棕色气体在装置D中收集到无色气体．当反应结束以后试管中残留固体为黑色． 2装置B的作用是． 3经小组讨论并验证该无色气体为O2其操作方法是． 4[查阅资料】①Ag2O和粉末的Ag均为黑色②Ag2O可溶于氨水． 【提出假设】试管中残留的黑色固体可能是①Ag②Ag2O③Ag和Ag2O． 【实验验证】该小组为验证上述设想分别取少量黑色固体进行了如下实验 【实验评价】根据上述实验不能确定固体产物成分的实验是填实验编号． 【实验结论】根据上述实验结果得出AgNO3固体受热分解的化学方程式为． 【实验拓展】另取2.0gAgNO3样品充分受热分解共收集到标准状况下气体的体积为336mL则样品中AgNO3的百分含量为．
8分2015WasaWarmWildYear.What'sNext?2015sawthingsheatupandgetoutofhandandnotjustinpolitics.ArecordwarmDecemberraisedaveragetemperaturesenoughtomake2015thesecondhottestyearonrecordinthecontiguousUnitedStatesaccordingtotheNationalOceanicandAtmosphericAdministration'sNationalClimateMonitoringAnnualReportwhichwasreleasedThursday.TheUnitedNationshadpreviouslyreportedthat2015wasshapinguptobethewarmestyearonrecordforthewholeplanet.LastyearwasalsothethirdwettestonrecordintheU.S.andsawtenweather﹣orclimate﹣relateddisastersthateachcausedatleast﹩1billionindamageintheU.S.andkilledatotalof155people.Theseincludeadroughttwofloodsfiveseverestormsawildfireandawinterstorm.TheaverageU.S.temperaturewas54.4°F2.4°Fabovethe20thcenturyaverageandsecondonlyto2012'srecordwarmth.Thiswasalsothe19thconsecutiveyearwithaveragetemperaturesabovetheaverageforthecentury.Everystatereportedabove﹣averageannualtemperatures.ThewarmingwasparticularlypronouncedacrossmostoftheeasternhalfofthecountryinDecemberwhenmanyplacessawtemperatures30degreesabovenormalandmanyrecordswereset.ThismirroredchangesseenintheArcticthatmonthwhentemperaturesspikedto50degreesabovenormal.PartofthiswarmingwasdrivenbyastrongElNiñoorperiodicwarminginthePacificOceanbutsomeofitcanalsobeattributedtoglobalwarmingsaysmeteorologistEricHolthauswhowasnotinvolvedwiththefederalreport.TheanalysiscomeslessthanamonthaftertheU.S.and194othercountriessignedanagreementinParistomoreaggressivelycountertheeffectsofclimatechange.'EvenifalltheinitialtargetsinParisaremetwe'llonlybepartofthewaytherewhenitcomestoreducingcarbonfromtheatmosphere'saidPresidentBarackObamaatthetime.Stilltheagreementrepresented'aturningpoint'bysettingup'thearchitecture'fordoingsohesaid.NOAA'sclimatemonitoringcenterdoesn'tissuepredictionsforfutureweatherbuttheagency'sClimatePredictionCenterdoes.Thatteam'sforecastforthenextthreemonthscallsforwarmer﹣than﹣averagetemperaturesinmuchofthecountryalthoughpartsofTexasandtheSoutheastmaybealittlecoolerthanusual.AsLancasterUniversityProfessorGailWhitemantoldtheWeatherChannel'climatechangemeansextremeweatheristhenewnormal.'1AccordingtothepassagethewarmestyearintheU.S.isA.2014B.2015C.notmentionedD.20122Accordingtothepassagewhichstatementisright?A.2015wasthethirdwettestyearonrecordinthewholeplanet.B.Tenweather﹣orclimate﹣relateddisastersintheU.S.includeadroughttwofloodsfourseverestormstwowildfiresandawinterstorm.C.The20thcenturyaveragetemperatureintheU.S.was52°F.D.ThewarmingwaspronouncedacrossmostofthewesternhalfofthecountryinDecember.3TheagreementtheUS.and194countriessignedaimedtoA.reducecarbonfromtheatmosphereB.countereffectsofclimatechange.C.setupthearchitectureD.findartificialwaystocooldowntheextremeweather4WhatdoesProfessorGailWhitemanmeaninthefuture?A.Extremeweatherwillbecommoninthefuture.B.Climatechangewillbenormal.C.Extremeweatherwillbenormalifwedon'ttakemeasures.D.Climatechangeleadtoextremeweather.
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