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在空间中存在垂直于纸面向里的匀强磁场，其竖直边界AB、CD的宽度为d，在边界AB左侧是竖直向下、场强为E的匀强电场，现有质量为m、带电量为+q的粒子（不计重力）从P点以大小为v0的水平初速度射入电场...
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高三下学期物理《》真题及答案
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在图中实线框所示的区域内同时存在着匀强磁场和匀强电场.一个带电粒子不计重力恰好能沿直线MN从左至右通
匀强磁场方向竖直向上，匀强电场方向垂直于纸面向外
匀强磁场方向竖直向上，匀强电场方向垂直于纸面向里
匀强磁场方向垂直于纸面向里，匀强电场方向竖直向上
匀强磁场和匀强电场的方向都水平向右
如图所示在空间中存在垂直纸面向里的场强为B.匀强磁场其边界ABCD的宽度为d在左边界的Q.点处有一质
如图所示在空间中存在垂直纸面向里的场强为B.匀强磁场其边界ABCD的宽度为d在左边界的Q.点处有一质
如图甲所示在空间存在垂直纸面向里的场强为B.的匀强磁场其边界ABCD相距为d在左边界的Q.点处有一个
在空间中存在垂直于纸面向里的匀强磁场其竖直边界ABCD的宽度为d在边界AB左侧是竖直向下场强为E的
如图所示直角三角形通电闭合线圈ABC处于匀强磁场中磁场垂直纸面向里则线圈所受磁场力的合力为
大小为零
方向竖直向上
方向竖直向下
方向垂直纸面向里
如图所示在空间中存在垂直纸面向里的场强为B.的匀强磁场其边界ABCD的宽度为d在左边界的Q.点处有一
12分如图所示在空间中存在垂直纸面向里的场强为B.匀强磁场其边界ABCD的宽度为d在左边界的Q.点处
如图所示在空间在存在垂直纸面向里的磁感应强度为B.的匀强磁场其边界AB到CD的宽度为dCD边界右侧为
如图所示匀强磁场方向垂直于纸面向里一束电子垂直于磁场射入则电子束将
向上偏转
向下偏转
垂直于纸面向里偏转
垂直于纸面向外偏转
如图所示在空间中存在垂直纸面向里的匀强磁场其竖直边界ABCD的宽度为d在边界AB左侧是竖直向下场强为
如图所示装置中区域Ⅰ中有竖直向上的匀强电场电场强度为E.区域Ⅱ内有垂直纸面向外的水平匀强磁场磁感应强
如图所示在空间中存在垂直纸面向里的场强为B.匀强磁场其边界ABCD的宽度为d在左边界的Q.点处有一质
如图所示在空间中存在垂直纸面向里的场强为B.匀强磁场其边界ABCD的宽度为d在左边界的Q.点处有一质
在图中PQMN为光滑金属导轨ab为金属棒与电源组成闭合电路该装置在竖直平面内为使ab静止可将该装置放
竖直向上
竖直向下
垂直于纸面向外
垂直于纸面向内
10分如图所示在空间中存在垂直纸面向里的场强为B.匀强磁场其边界ABCD的宽度为d在左边界的Q.点处
在空间中存在垂直纸面向里的匀强磁场其竖直边界ABCD的宽度为d在边界AB左侧是竖直向下场强为E.的匀
10分如图所示在空间中存在垂直纸面向里的场强为B.匀强磁场其边界ABCD的宽度为d在左边界的Q.点处
12分如图所示在空间中存在垂直纸面向里的场强为B.匀强磁场其边界ABCD的宽度为d在左边界的Q.点处
地面附近空间中存在着水平方向的匀强电场和匀强磁场已知磁场方向垂直纸面向里一个带电油滴能沿一条与竖直
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在△ABC中内角ABC所对的边分别为abc．已知b+c=2a3csinB=4asinC． Ⅰ求cosB的值 Ⅱ求sin2B+的值．
Ablackholeisaspotinspacethathas1powergravity.Itsgravityissostrongthatitpullseverythingnearbyintoitstarsplanetsandotherthings.Blackholesformwhenastardies.Whenthathappensahugeamountofmattercrowdsintoaverysmallspace2becomesverydense.Blackholes3talkaboutin1783first.Thatyearonescientistsaidthatintheuniversetheremightbeplaceswithstronggravitytotraplightalthoughhedidn'tusethetermblackhole.
室温下下列各组离子在指定溶液中能大量共存的是
NewAppHelpsPeopleRememberFaces Largegatheringssuchasweddingsandconferencescanbesociallyoverwhelming.Pressuretolearnpeople'snamesonlyaddstothestress.Anewfacial﹣recognitionappcouldcometotherescuebutprivacyexpertsrecommendproceedingwithcaution. TheappcalledSocialRecallconnectsnameswithfacesviasmartphonecamerasandfacialrecognitionpotentiallyavoidingtheneedforformalintroductions.ItbreaksdownthesesocialbarriersweallhavewhenmeetingsomebodysaysBarrySandrewwhocreatedtheappandtesteditataneventattendedbyabout1000people. AfterreceivinganinvitationtodownloadSocialRecallfromaneventorganizertheuserisaskedtotaketwoselfiesandsigninviasocialmedia.Attheeventtheappisactivewithinapreviouslydefinedgeographicalarea.Whenauserpointshisorherphonecameraatanattendee'sfacetheappidentifiestheindividualdisplaystheperson'snameandlinkstohisorhersocialmediaprofile.Toprotectprivacyitrecognizesonlythosewhohaveagreedtoparticipate.Andtheapp'screatorssayitautomaticallydeletesusers'dataafteranevent. AnnCavoukianaprivacyexpertwhorunsthePrivacybyDesignCenterofExcellencepraisestheapp'screatorsfortheseprotectivemeasures.Shecautionshoweverthatwhenpeoplechoosetosharetheirpersonalinformationwiththeapptheyshouldknowthattheremaybeunintendedconsequencesdowntheroadwiththatinformationbeingusedinanothercontextthatmightcomebacktobiteyou. Thestart﹣uphasalsodevelopedaversionoftheappforindividualswhosufferfromprosopagnosiaorfaceblindnessaconditionthatpreventspeoplefromrecognizingindividualstheyhavemet.Tousethisappapersonfirstacquiresanimageofsomeone'sfacefromeitherthesmartphone'scameraoraphotographandthentagsitwithaname.Whenthecameraspotsthatsamefaceinreallifethepreviouslyenteredinformationisdisplayed.Thecollecteddataarestoredonlyonauser'sphoneaccordingtotheteambehindtheapp. 1SocialRecallisusedto. A.takephotos B.identifypeople C.organizeevents D.makefriends 2Paragraph3ismainlyabout. A.howtheappworks B.howtheappwascreated C.whatmakestheapppopular D.whatpeoplecandowiththeapp 3SocialRecallhelpspeoplewithprosopagnosiaby. A.givingnamestothephotoskeptintheirsmartphones B.collectinginformationpreviouslyenteredinthephone C.providingtheinformationofapersonwhentheyfirstmeet D.showingtheperson'sinformationwhenitspotsastoredface 4WhatcanwelearnaboutSocialRecallfromthepassage A.Itmayputpeople'sprivacyatrisk. B.Ithascausedunintendedconsequences. C.Itcanpreventsomecommunicationdisorders. D.Itispraisedbyusersforitsprotectivemeasures.
RayTokudaa54﹣year﹣oldJapaneseAmericanisproudofthetitlehisschoolhasgivenhim.HeisaShifuaChinesewordliterallymeaningamastermentororseniorpractionerofmartialarts. Tokudahasreasontobeproud.HehasbeeninvolvedwithChinesemartialartsforalmostfourdecades.AfterlearningthematthemartialartsschoolinNewMexicoStatetodayheisamongthemostexperiencedkungfuteachersoftheschool. PracticingmartialartstwotothreehoursandhelpingstudentsimprovetheirskillshavebecomeTokuda'sdailyroutine.Heexpectstopracticeandteachmartialartsfortherestofhislife.I'mstilllearning.It'sworthmorethanalifetimetolearnChinesemartialartshesaid.OnceIstartedIjustcouldn'tstop.Ithinkit'salsothemagicofChineseculture. Tokudawassenttothemartialartsschoolwhenhewas10.Hestillremembershowunwillinghewaswhenstartingout.MyfatherhadalwayswantedtolearnChinesemartialartsbutnevergotthechancesoheputhiskidinhesaid.IwassoafraidatthattimebecauseIthoughtkungfuwasallaboutfighting. Butthingschangedafterhelearnedthatmartialartsweremorethanpunchingandkicking. OneofthethingsmartialartsteachmeisovercomingadversityTokudasaid.AsalittlekidmyfirstlessonwaslikeohlookthisisathingthatIcangetthroughbydiligenceperseverance毅力anddedicationandthatwaspricelessformylife. LearningChinesemartialartsopenedagatewayforhimtobetterunderstandChineseculturebecausehecouldhearalotofancientChinesekungfu﹣relatedstories.ItislikeinAmericawherewehearstoriesaboutknightsinshiningarmorandKingArthurandnobledeedsdonehesaid.IfeelmartialartspreservesomethingofancientChinathatcan'tbefoundinbooks.Theyaresortofanoralhistory. TokudahasalsobeeninvitedtovariouseventsinhishomestatetoshowcasetraditionalChinesecultureincludingthedragondanceandliondancewhichhealsolearntatthemartialartsschool.Becauseofthisheisnowconsideredaculturalenvoy使者intheeyesofthepublic. 1Tokudadidn'twanttolearnkungfubecausehehadthoughtitwas. A.practical B.magical C.violent D.difficult 2FromthepassagewhatcanwelearnaboutTokuda A.Helearntmartialartsfromhisfather. B.Heisthefounderofthekungfuschool. C.Helearntfrommartialartshowtodealwithdifficulties. D.Heisthemostexperiencedkungfuteacherofhisstate. 3WhichofthefollowingwordscanbestdescribeTokuda A.Modestandfriendly. B.Devotedandpersevering. C.Talentedandhumorous. D.Motivatedandconsiderate.
OldTomhadfoursons.Hewantedthem1learnnottojudgethingstooquickly.Sohesentthemtolookatanappletreeindifferentseasons.Thefirstsonwentinwinterthesecondinspringthethirdinsummerandtheyoungestinautumn.Whentheyallcamebackhecalledthemtogethertodescribe2theyhadseen.Thesonshaddifferent3opinion.Tomthentoldthemthattheyshouldn'tjudgeatreeorapersonbyonlyoneseason.
Smile!Itmakeseveryoneintheroomfeelbetterbecausetheyconsciouslyorunconsciouslyaresmilingwithyou.Growingevidenceshowsthataninstinctforfacialmimicry模仿allowsustoempathizewithandevenexperienceotherpeople'sfeelings.Ifwecan'tmirroranotherperson'sfaceitlimitsourabilitytoreadandproperlyreacttotheirexpressions.AreviewofthisemotionalmirroringappearsonFebruary11inTrendsinCognitiveSciences. IntheirpaperPaulaNiedenthalandAdrienneWoodsocialpsychologistsattheUniversityofWisconsindescribehowpeopleinsocialsituationscopyothers'facialexpressionstocreateemotionalresponsesinthemselves.Forexampleifyou'rewithafriendwholookssadyoumighttryonthatsadfaceyourselfwithoutrealizingyou'redoingso.Intryingonyourfriend'sexpressionithelpsyoutorecognizewhatthey'refeelingbyassociatingitwithtimesinthepastwhenyoumadethatexpression.Humansgetthisemotionalmeaningfromfacialexpressionsinamatterofonlyafewhundredmilliseconds. Youreflectonyouremotionalfeelingsandthenyougeneratesomesortofrecognitionjudgmentandthemostimportantthingthatresultsinisthatyoutaketheappropriateaction﹣youapproachthepersonoryouavoidthepersonNiedenthalsays.Yourownemotionalreactiontothefacechangesyourperceptionofhowyouseethefaceinsuchawaythatprovidesyouwithmoreinformationaboutwhatitmeans. Aperson'sabilitytorecognizeandshareothers'emotionscanbepreventedwhentheycan'tmimicfaces.Thisisacommoncomplaintforpeoplewithmotordiseaseslikefacialparalysis瘫痪fromastrokeorevenduetonervedamagefromplasticsurgery.Niedenthalnotesthatthesamewouldnotbetrueforpeoplewhosufferfromparalysisfrombirthbecauseifyou'veneverhadtheabilitytomimicfacialexpressionsyouwillhavedevelopedcompensatorywaysofinterpretingemotions. Peoplewithsocialdisordersassociatedwithmimicryoremotion﹣recognitiondamagelikeautism自闭症canexperiencesimilarchallenges.TherearesomesymptomsinautismwherelackoffacialmimicrymayinpartbeduetolimitationofeyecontactNiedenthalsays. Niedenthalnextwantstoexplorewhatpartinthebrainisfunctioningtohelpwithfacialexpressionrecognition.Abetterunderstandingofthatpartshesayswillgiveusabetterideaofhowtotreatrelateddisorders. 1Accordingtothepassagefacialmimicryhelps. A.experienceone'sownfeelingsclearly B.changeothers'emotionsquickly C.respondtoothers'expressionsproperly D.developfriendshipwithotherseasily 2WecanknowfromParagraph4and5that. A.peoplewithmotordiseasesmayalsosufferfromautism B.peoplebornwithfacialparalysismaystillrecognizeemotions C.peoplewithsocialdisorderscan'thaveeyecontactwithothers D.peoplereceivingplasticsurgeryhavedifficultyinmimickingfaces 3AccordingtoNiedenthalthenextstepofthestudywillfocuson. A.howwecantreatbraindisorders B.whatcanbedonetoregainfacialmimicry C.howourbrainhelpsuswithemotionalmirroring D.whatpartofourbrainhelpsrecognizefacialexpression 4Thepassageiswrittento. A.discusshowpeoplereactpositivelytoothers'smiles B.drawpeople'sattentiontothosewithsocialdisorders C.introduceanewtrendinfacialexpressionrecognition D.explainhowemotionalmirroringaffectspeople'sempathy
稀土元素包括元素周期表中的镧系元素以及与镧系元素化学性质相似的钪Sc和钇Y元素．请回答下列问题 1镧系元素位于元素周期表第族镧系元素位于周期表的区． 2基态钪原子的价电子排布式为． 3大多数稀土元素的金属离子易与乙二胺H2NCH2CH2NH2等配位乙二胺中价层电子对数为4的原子为填元素符号乙二胺和三乙胺[CH3CH23N]均属于胺类但是乙二胺比三乙胺的沸点高得多其原因是． 4稀土元素最常见的化合价为+3价但也有少数还有+4价请根据图1的电离能数据判断图30中最可能有+4价的元素是填元素符号在加热条件下其低价氯化物易发生水解其无水低价氯化物可用加热含六个结晶水的低价氯化物和NH4Cl固体混合物的方法来制备．其中NH4C1的作用是． 5镱Yb是电脑记忆元件的重要元素其单质晶胞结构如2所示晶胞中镱原子的配位数为若晶胞边长为apm镱原子半径为pm阿伏加德罗常数的值为NA则镱单质的密度为g•cm﹣3用含aNA的代数式表示．
设x＞0y＞0x+2y=5则的最小值为．
Everyone1lovesnow.Butwhenschoolstaysopendespitethesnowitcanbereallyannoying.Howeverthereisoneupsideofgoingtoschool2acoldwinterdayyoumightbesmarter.Sofarresearcherswhostudythebrain3findthatcoldtemperaturesmakeusthinkmorequicklysincemessagestravelfasteramongourbraincells.Sothescientistssay4hangoutonacoldmorningmayboosttheresultofanytestthatday.
MyPerfectImperfectLife AfewyearsagoIwasstandingatthebarre扶手杠waitingformyadultballetclasswhenIheardavoicebehindme.Sodoyouhavethisperfectlife Myfirstreactionwasto1whowasbeingaskedsuchanoddquestion.ThenIrememberedtherewereonlytwoofusintheroom.WhenIturned2theotherwomanwaslookingstraightatme. Ihadnoideahowtoanswerit.Wasshe3WhohasaperfectlifeSureoccasionallyIdidfindtheperfectdressortheperfectpairofshoes4neverwouldIusethatwordtodescribeanythingaboutmeormylife.Ifeltatwingeofguiltforsomehowgivingherthat5. Shewatchedme.Ifinally6towhisperaquickNo. Bythentheteacherhadenteredtheroomandturnedonthemusictostartclass.Withasighof7Imovedmyfeetintothebestposition.ButassoonasmykneesbentforourfirstposeIrealizedmy8hadbeendisturbed.Thiswoman'swordswouldn't9echoinginmythoughts. Iwantedtoknowhowshecameupwithherverymistaken10.Ifsheknewanythingaboutmylifesheneverwouldhavehadthe11toaskmethatquestion. Ididmybesttodoourfloorexercisesinfrontofthemirror.ForafewmomentsIdidn'tseetheusual12ofmyolderselfattemptingtouseabeautifulartformto13mygracefulness.Ionlysawthelittlegirlwhosefatherdiedwhenshewastwothechildwhowalkedhomefromelementaryschooleverydaytoanemptyhousewholearnedtosewherownclothesto14money. Perfect.Mylifehadbeenfarfromit. Whenthosememories15IwasleftwithavisionofthewomanIhadbecomethewoman16byallthosethingsIconsideredimperfect.Inowsawthewomanwhohadlearnedtobeself﹣reliantwho17herfamilyandherfriendswhodidn'ttakelifeforgranted.Wasthattheperfectthiswomanhaddetected Istilldon'tknowbutInolongerfeel18orfeellikeImustkeeptrackofallthedifficulttimestoprovemylifeisn't19.IfeveragainaskedwhethermylifeisperfectIwouldhaveadifferent20.BecausenowIseethatdespiteallitsimperfectionitis. 1A.notice B.understand C.wonder D.expect 2A.up B.away C.over D.around 3A.fair B.serious C.anxious D.wise 4A.but B.or C.for D.and 5A.intention B.instruction C.impression D.information 6A.learned B.managed C.agreed D.planned 7A.sadness B.surprise C.pleasure D.relief 8A.concentration B.patience C.confidence D.effort 9A.escape B.keep C.stop D.stand 10A.idea B.advice C.reason D.theory 11A.right B.urge C.excuse D.honor 12A.reflection B.preference C.appearance D.expression 13A.experience B.describe C.replace D.improve 14A.collect B.earn C.spend D.save 15A.faded B.failed C.floated D.flashed 16A.buried B.shaped C.watched D.followed 17A.changed B.welcomed C.valued D.protected 18A.worried B.guilty C.cautious D.desperate 19A.comfortable B.ordinary C.perfect D.meaningful 20A.solution B.message C.approach D.answer
i是虚数单位则||的值为．
用电解法处理含Cr2O72﹣的废水探究不同因素对含Cr2O72﹣废水处理的影响结果如表所示Cr2O72﹣的起始浓度体积电压电解时间均相同．下列说法错误的是 表
化学的应用无处不在下列说法正确的是
短周期主族元素XYZW原子序数依次增大X位于第ⅣA族Y元素原子最外层电子数是次外层的3倍Z原子半径为同周期中最大W与Y同主族．下列说法正确的是
如图AE⊥平面ABCDCF∥AEAD∥BCAD⊥ABAB=AD=1AE=BC=2． Ⅰ求证BF∥平面ADE Ⅱ求直线CE与平面BDE所成角的正弦值 Ⅲ若二面角E-BD-F的余弦值为求线段CF的长．
设{an}是等差数列{bn}是等比数列．已知a1=4b1=6b2=2a2-2b3=2a3+4． Ⅰ求{an}和{bn}的通项公式 Ⅱ设数列{cn}满足c1=1cn=其中k∈N*． i求数列{ac-1}的通项公式 ii求aicin∈N*．
设NA为阿伏加德罗常数的值下列说法正确的是
用化学用语表示Na2O+2HCl═2NaCl+H2O中的相关微粒其中正确的是
已知四棱锥的底面是边长为的正方形侧棱长均为．若圆柱的一个底面的圆周经过四棱锥四条侧棱的中点另一个底面的圆心为四棱锥底面的中心则该圆柱的体积为．
假设你是红星中学高三学生李华请根据以下四幅图的先后顺序以ANewWaytoExploretheForbiddenCity为题用英语写一篇短文向校刊英语园地投稿记述上周末你带英国朋友Jim游览故宫的全过程. 注意词数不少于60. 提示词二维码QRcode
下列有关物质性质的叙述不正确的是
常温常压下将amolCO2气体通入含bmolNaOH的溶液中下列对所得溶液的描述正确的是
根据下列实验操作和现象所得出的结论正确的是
假设你是红星中学高三学生李华你的英国朋友Jim在给你的邮件中提到他暑假将来北京参加外国人唱中国歌大赛希望你为他推荐一首中文歌曲.请给他回邮件内容包括 1.推荐曲目 2.推荐理由 3.你的祝愿. 注意1.词数不少于50 2.开头和结尾已给出不计入总词数. DearJim Yours LiHua
GOINGTOUNIVERSITYissupposedtobeamind﹣broadeningexperience.Thatstatementisprobablymadeincomparisontotrainingforworkstraightafterschoolwhichmightnotbesoencouraging.ButisitactuallytrueJessikaGolleoftheUniversityofTübingeninGermanythoughtshewouldtrytofindout.Herresulthoweverisnotquitewhatmightbeexpected.AsshereportsinPsychologicalSciencethisweekshefoundthatthosewhohavebeentouniversitydoindeedseemtoleavewithbroaderandmoreinquiringmindsthanthosewhohavespenttheirimmediatepost﹣schoolyearsinvocational职业的trainingforwork.Howeveritwasnotthecasethatuniversitybroadenedminds.Ratherworkseemedtonarrowthem. Dr.Gollecametothisconclusionaftersheandateamofcolleaguesstudiedtheearlycareersof2095Germanyoungsters.Theteamusedtwostandardizedteststoassesstheirvolunteers.Onewasofpersonalitytraitsincludingopennessconscientiousness认真andsoon.Theotherwasofattitudessuchasrealisticinvestigativeandenterprising.Theyadministeredbothteststwice﹣oncetowardstheendofeachvolunteer'stimeatschoolandthenagainsixyearslater.Oftheoriginalgroup382wereontheintermediatetrackfromwhichtherewasachoicebetweentheacademicandvocationalroutesanditwasonthesethattheresearchersfocused.Universitybeckonedfor212ofthem.Theremaining170chosevocationaltrainingandajob. WhenitcametothesecondroundoftestsDr.Gollefoundthatthepersonalitiesofthosewhohadgonetouniversityhadnotchangedsignificantly.Thosewhohadundergonevocationaltrainingandthengotjobswerenotthatmuchchangedinpersonalityeither﹣exceptinonecrucialrespect.Theyhadbecomemoreconscientious. Thatsoundslikeagoodthingcertainlycomparedwiththecommonpublicimageofundergraduatesasabunchoflazybones.Butchangesinattitudethattheresearchersrecordedwereratherworrying.Intheuniversitygroupagainnoneweredetectable.Butthosewhohadchosenthevocationalrouteshowedmarkeddropsininterestintasksthatareinvestigativeandenterprisinginnature.Andthatmightrestricttheirchoiceofcareers. Someinvestigativeandenterprisingjobssuchasscientificresearchareindeedbeyondthedegreeless.ButmanyparticularlyinGermanywithitstraditionofvocationaltrainingarenot.Theresearchersmentionforexamplecomputerprogrammersandfinance﹣sectorworkersascareersrequiringthesetraits.IfDr.GolleiscorrectandchangesinattitudebroughtaboutbytheverytrainingGermanypridesitselfonarenarrowingpeople'schoicesthatisindeedamatterworthyofseriousconsideration. 1WhichofthefollowingcanbestreplacebeckonedforinParagraph2 A.Examined. B.Attracted. C.Organized. D.Recognized. 2Whatcanwelearnfromtheresearch A.Thedegreelesshavenotchangedinpersonalities. B.Goingtouniversityisamind﹣broadeningexperience. C.Workingstraightafterschoolnarrowspeople'sminds. D.Collegestudentspridethemselvesontheireducation. 3Accordingtothelasttwoparagraphs. A.collegestudentsenjoyaverygoodpublicimage B.theundergraduateshavechangedsignificantlyinattitude C.thedegreelessaremuchbetteratdealingwithchallengingtasks D.peopleshowlessinterestininvestigativejobsduetovocationaltraining 4Whatistheauthor'sattitudetowardsthefinding A.Concerned. B.Optimistic. C.Unclear. D.Sceptical.
下列说法正确的是
BenefitsofSports Doingsportsisaphysicalmentalandsocialadventure.It'sagreatwayforchildrentotakeabreakfromacademicsandreleaseextraenergy.Italsohelpsthemleadfullerandhappierlivesasregularsportshaveproventoimproveoverallwell﹣being. Thephysicalbenefitsofdoingsportsareprobablythemostobvious.Regardlessofyourfitnesslevelwhenyoustartplayingsportsyou'llnoticeanincreaseinyouroverallfitnessonceyou'reinvolved.1Basketballplayersfocusonstrengthtrainingfootballplayersworkonspeedwhiletrackathletestrainthroughlongerruns.Thetrainingprocesshelpspromotephysicalfitnessandperformancesincompetitions. 2Playingsportscontributestomentalhealthhelpingtoincreaseconfidenceandself﹣worth.Apatonthebackhigh﹣fivefromateammateorhandshakeafteramatchreallyboostsachild'sconfidence.Wordsofpraiseandencouragementfromthecoachparentsandotherplayersraisetheself﹣worth.3Soafteragameit'sabetterideatoaskDidyouenjoythegameratherthanDidyouwin Childrenwhoparticipateinsportsmightalsobenefitfromthesocialaspectfeelingpartofagroupbuildingupaccountabilityandleadership.4Teamworkinvolvesbothbeingdependableasateammateandlearningtorelyonyourteammatestoachieveapositiveoutcome.Teamworkbreedsaccountabilityandchallengesyoutoberesponsibleforyouractions.Beingpartofateamgivesyouanopportunitytobealeader. Disciplineisanothersocialadvantage.Mostorganizedsportsrequireastricttrainingandpracticeschedule.Asastudent﹣athleteyouneedtobalanceacademicsandathletics.5 Thereisnoshortageofreasonstofindasporttogetinvolvedin.AreyoureadytogoPickoneandgetmoving! A.It'snotjustyourbodythatbenefitsfromsports. B.Thereforeplayingsportsisgoingtomakeyoumorefit. C.Butrememberachild'sself﹣worthshouldnotbedistinguishedbyvictoryorloss. D.Ifyouplaygroupsportsyou'llbepartofateamthattakesdirectionfromacoach. E.Nearlyeverysportrequiresphysicalactivityandtheskillsneededtobecompetitive. F.Amongtheselearninghowtofunctionaspartofateamisthemostimportantadvantage. G.Onlywithstrictdisciplinecanyoubesuccessfulbothintheclassroomandinthesportsfield.
钼酸钠晶体Na2MoO4•2H2O是一种金属腐蚀抑制剂．工业上利用钼精矿主要成分是不溶于水的MoS2制备钼酸钠的两种途径如图所示 1Na2MoO4•2H2O中钼元素的化合价是． 2在途径Ⅰ中 ①为了提高焙烧效率除增大空气量外还可以采用的措施有焙烧后的尾气中含有SO2需要处理下列不能用作吸收剂的是填字母 a．CaOH2b．HNO3c．Na2CO3 ②焙烧生成MoO3也可以利用铝热反应回收金属钼写出该反应的化学方程式 ③碱浸时生成Na2MoO4和另一种气体A该气体A的电子式为碱浸后的钼酸钠溶液中cMnO42﹣＝0.40mol•L﹣1cCO32﹣＝0.10mol•L﹣1由钼酸钠溶液制备钼酸钠晶体时需加入BaOH2固体以除去CO32﹣当BaMoO4开始沉淀时CO32﹣的去除率是已知KspBaCO3＝1.0×10﹣9KspBaMoO4＝4.0×10﹣8忽略溶液的体积变化 ④Na2MoO4溶液重结晶得到的母液可以在下次重结晶时重复使用但达到一定次数后必须净化处理原因是“分析纯”的钼酸钠常用钼酸铵[NH42MoO4]和氢氧化钠反应来制取若将该反应产生的气体与途径Ⅰ所产生的气体一起通入水中得到正盐的化学式是． 3在途径Ⅱ中氧化时还有Na2SO4生成则反应的离子方程式为．
常温下在新制氯水中滴加NaOH溶液溶液中水电离出的氢离子浓度的对数lg[c水H+]与NaOH溶液的体积之间的关系如图所示下列推断正确的是
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