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如图所示，面积为S的矩形线圈共N匝，线圈总电阻为R，在磁感应强度为B、方向垂直纸面向里的匀强磁场中绕竖直轴OO′以角速度ω匀速转动，图示位置C与纸面共面，位置A与位置C成45°角．线圈从位置A转过9...
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高三下学期物理《》真题及答案
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面积为0.1m2的120匝矩形线圈放置在与线圈平面垂直的匀强磁场中线圈总电阻为1.2Ω磁感应强度随时
如图所示n＝50匝的矩形线圈abcd边长ab＝20cmbc＝25cm放在磁感应强度B.＝0.4T.的
如图所示有一矩形线圈面积为S.匝数为N.总电阻为r外电阻为R.接触电阻不计线圈绕垂直于磁感线的轴OO
当线圈平面与磁感线平行时，线圈中电流为零
电流有效值
电动势的最大值为
外力做功的平均功率
N匝矩形线圈面积为S线圈电阻为R在磁感应强度为B的匀强磁场中绕垂直于磁感线的轴以角速度ω做匀速转动则
9分如图所示n=50匝的矩形线圈abcd边长ab=20cmbc=25cm放在磁感强度B.=0.4T的
如图所示ab=25cmad=20cm匝数为50匝的矩形线圈线圈总电阻r=1Ω外电路电阻R=9Ω磁感应
如图所示一矩形线圈在匀强磁场中绕OO′轴匀速转动磁场方向与转轴垂直线圈的长l1=0.50m宽l2=0
如图1所示矩形线圈abcd在磁感强度B=2T的匀强磁场中绕轴OO′以角速度ω=10πrad/s匀速转
如图所示ab=25cmad=20cm匝数为50匝的矩形线圈线圈总电阻r=1Ω外电路电阻R=9Ω磁感应
如图所示一个圆形线圈的匝数n=1000线圈面积线圈的电阻为r＝1Ω在线圈外接一个阻值R=4Ω的电阻电
如图所示矩形线圈abcd的匝数为N=50匝线圈ab的边长为l1=0.2mbc的边长为l2=0.25m
如图所示有一矩形线圈面积为S.匝数为N.总电阻为r外电阻为R.接触电阻不计线圈绕垂直于磁感线的轴OO
当线圈平面与磁感线平行时，线圈中电流最大
电流有效值
电动势的最大值为
外力做功的平均功率
如图所示N=50匝的矩形线圈abcd边长ab=20cmad=25cm放在磁感强度B.=0.4T.的匀
如图所示N.＝50匝的矩形线圈abcd边长ab＝20cmad＝25cm放在磁感应强度B.＝0.4T.
一矩形线圈面积是0.05m2共100匝线圈电阻为2Ω外接电阻为R=8Ω线圈在磁感应强度为B.=1/特
如图所示有一矩形线圈面积为S.匝数为N.总电阻为r外电阻为R.接触电阻不计线圈绕垂直于磁感线的轴OO
当线圈平面与磁感线平行时，线圈中电流为零
电流有效值
电动势的最大值为
外力做功的平均功率
如图所示线圈面积为0.05m2共100匝线圈总电阻为r=1Ω外电阻R.=9Ω线圈处于B.=T的匀强磁
如图所示长25cm宽20cm的矩形线框上绕有100匝的线圈线圈总电阻为1Ω.接在线圈两端的电阻R＝9
如图所示线圈abcd的面积S.=0.05m2共N.=100匝线圈电阻为r=1外接电阻R.=9匀强磁场
如图所示矩形线圈的匝数为n线圈面积为S线圈电阻为r在磁感应强度为B的匀强磁场中绕OO′轴以角速度ω匀
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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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CO2与H2的混合气体5g在150℃时和足量的氧气混合用电火花充分引燃在相同状况下再将反应后所得混合气体通入到足量的Na2O2中测得Na2O2固体增重的质量为3.4g则原混合气体中CO2的物质的量分数为
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括 1.主题环境保护 2.展览时间 3.投稿邮箱intlphotoshow@gmschool.com. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
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一个长方体被一个平面截去一部分后所剩几何体的三视图如图所示则该几何体的体积为
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
已知直线l为函数y＝ex图象的切线若l与函数y＝﹣x2的图象相切于点m﹣m2则实数m必定满足
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Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable.Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished.Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy.Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout.
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．
Focusingontheunfairnessofcircumstanceskeepsyoucomparingyourselveswithothers_____appreciatingyourownspecialuniqueness. A.ratherthan B.morethan C.betterthan D.otherthan
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.
Mostofemployersareplanningtocutdownonwagesinsteadoflayingoffemployees______theeconomicdepression. A.indefenseof B.withregardto C.onbehalfof D.inresponseto
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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电动势的最大值为
外力做功的平均功率
电动势的最大值为
外力做功的平均功率
电动势的最大值为
外力做功的平均功率
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