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甲、乙两人加工同一种零件，甲每天加工的数量是乙每天加工数量的1.5倍，两人各加工600个这种零件，甲比乙少用5天． （1）求甲、乙两人每天各加工多少个这种零件？ （2）已知甲、乙两人加工这种零件...
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甲乙两人加工同一种机器零件甲加工了280个比乙5天加工零件的个数少40个．乙平均每天加工多少个列方程
甲乙两人加工同一种零件甲每小时比乙多加工4个乙每小时比甲少加工．求甲乙两人每小时各加工多少个
某车间安排了若干工人加工甲乙两种零件每个工人每天可加工甲零件15个或者加工乙零件10个某种仪器每套需
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甲乙两人加工同一种玩具甲加工90个玩具所用的时间与乙加工120个玩具所用的时间相等已知甲乙两人每天共
甲乙两人加工同一种机器零件甲比乙每小时多加工10个零件甲加工150个零件所用时间与乙加工120个零件
甲乙两人合作加工684个零件经过18天完成甲每天加工25个乙每天加工多少个
甲乙两人加工同一种玩具甲加工个玩具所用的时间与乙加工个玩具所用的时间相等.已知甲乙两人每天共加工个玩
甲乙两人要各自在车间加工一批数量相同的零件甲每小时可加工25个乙每小时可加工20个．甲由于先去参加
甲乙两人加工同一种机器零件甲比乙每小时多加工10个零件甲加工150个零件所用时间与乙加工120个零件
某工厂甲负责加工A型零件乙负责加工B型零件．已知甲加工60个A型零件所用时间和乙加工80个B型零件
甲乙两人加工零件甲做4小时乙做6小时共加工零件196个甲做7小时乙做3小时共加工零件208个甲乙两人
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甲乙两人加工同一种零件甲加工的零件个数比乙少20%乙加工的时间比甲少乙的工作效率是甲的%．
.甲乙两人加工同一种机器零件甲比乙每小时多加工10个零件甲加工150个零件所用的时间与乙加工120个
某车间安排了若干工人加工甲乙两种零件每个工人每天可加工甲零件15个或者加工乙零件10个某种仪器每套需
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某车间安排了若干工人加工甲乙两种零件每个工人每天可加工甲零件15个或者加工乙零件10个某种仪器每套需
18
21
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甲乙两人共同加工560个零件8天完成．已知甲每天加工的零件数是乙每天加工的1.8倍则甲乙每天各加工
甲乙两人每天加工零件个数的比是34两人合作15天后甲乙两人各自加工零件的个数比是．
甲乙两人加工一批零件．如果甲每天加工120个乙每天加工80个那么需要7天才能加工完问这批零件一共有
甲乙二人加工零件甲比乙每天多加工6个零件乙中途停了15天没有加工40天后乙加工的零件个数正好是甲的一
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甲乙两人加工同一种玩具甲加工90个玩具所用的时间与乙加工110个玩具所用的时间相同已知甲乙两人每天
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ChangeyourlifearoundinfoureasystepsChangeyourwayofthinkingYourhomeenvironmenthasnodoubtinstilled灌输certainexpectationsinyouabouthowyourlifeshoulddevelop.1.dependingonyourbackground.Tochangeyourlifearoundstartbyshakingoffsuchexpectationsandsettingyourselfsomenewgoals.2Askyourselfwhatyoureallywantoutoflife.Makealistofideasaboutyourcareermoneypeopleyoulovethingsyou'dliketodoetc.Studyitsoastodecidewhichthreeitemsarethemostimportanttoyou.3.It'sunrealistictoimaginedoingso.Butbyconsciouslychoosingthreespecificgoalsyouwillbeamazedathowmuchmorefocusedanddeterminedyoufeel.OvercomeyourdoubtsConfidenceiseverything.Allthesameacertainamountoffearanduncertaintyisnatural.4.andremainfocusedonyourgoal.Althoughyoumaybeshakingontheinsideshowoutwardconfidenceandbelieveinyourself.Learntovieweveryobstacleasachance.Ifatfirstyoudon'tsucceed﹣﹣Weareallafraidoffailing.Bethatasitmayfailureisanimportantpartofsuccessandyouneedtoholdontothatfactandseesetbacksassteppingstonestowardsyourfinalgoal.5.youshoulduseyourmistakesaslearningtoolsandmoveon.A.LimityourtimeB.PracticehidingitC.FocusyoureffortsD.DifficultthoughitmayseematthetimeE.HoweverthesemaylimityouorbemisleadingF.Rememberit'snevertoolatetolearnsomethingnewG.Howevermuchyou'dliketoachieveeverythingonyourlist
SmallincreasesintemperaturefoundtoaddpowertostormsintheAtlantic.HurricanesthatformintheAtlanticOceanareexpectedtogainconsiderablestrengthastheglobaltemperaturecontinuestoriseanewstudyhasfound.UsingmodelingdatafocusedontheconditionsinwhichhurricanesformagroupofinternationalresearchersbasedatBeijingNormalUniversityfoundthatforevery1.8°F1℃riseoftheEarth'stemperaturethenumberofhurricanesintheAtlanticthatareasstrongorstrongerthanHurricaneKatrinawillincreasetwofoldtosevenfold.Hurricanestrengthisdirectlyrelatedtotheheatofthewaterwherethestormforms.Morewatervaporintheairfromevaporatingoceanwateraddsfueltohurricanesthatbuildstrengthandheadtowardland.HurricaneKatrinaiswidelyconsideredthemeasureforadestructivestormholdingthemaximumCategory5designationforafull24hoursinlateAugust2005.ItloststrengthasitpassedovertheFloridapeninsulabutgaineddestructivepowerfightbeforecollidingwithNewOrleanskillingmorethan200peopleandcausing﹩80billionindamage.ThestudypointstoagradualincreaseofKatrina﹣likeevents.Thewarmingexperiencedoverthe20thcenturydoubledthenumberofsuchdebilitating将人类摧垮的storms.Buttheongoingwarmingoftheplanetintothe21stcenturycouldincreasethefrequencyoftheworstkindsofstormsby700percentthreateningcoastlinesalongtheAtlanticOceanwithmuitipleCategory5stormseveryyear.'Ourresultssupporttheideathatchangesinregionalseasurfacetemperaturesistheprimarycauseofhurricanevariability'saidAslakGirnsteadaresearcherwiththeCenterforIceandClimateattheUniversityofCopenhagen.Thelargeimpactofsmallsea﹣surfacetemperatureincreaseswasmorethanGirusteadandhiscolleagueshadanticipated.TheentirestudywaspublishedintheProceedingsoftheNationalAcademyofSciences.Globaltemperatureshavesteadilyincreasedmakingthepastdecadethewarmestonrecord.EarlierthisyearclimateresearchersreportedthattheEarth'stemperatureshaverisenfasterinthelastcenturythanatanypointsincethelasticeage11300yearsago.Theprimarycauseacouseususofscientistshassaidistherisingemissionsofgreenhousegaseslikecarbondioxideandmethane.Pasthurricaneshavesupportedthestudy'sfindingthatglobaltemperatureriseislinkedtomoredestructivestorms.AccordingtotheNationalCenterforAtmosphericResearchwhilethefrequencyofstormsdoesn'tappeartohaveincreasedthepercentageofstrongoneshasrisensharplyoverthepastfewdecades.Thetrendmaybesimilarfurtherbackintimebutcomprehensivehurricanedatadoesn'texist.1AccordingtotheteamofinternationalresearchersbasedatBeijingNormalUniversitytheriseoftheEarth'stemperatureislikelytocause.A.thecomingoficeageB.lessintensehurricanesC.moreKatrina﹣likeorworsehurricanesD.moregreenhousegasesintheatmosphere2Theoceanwaterintheregionwherethestormforms.A.isheatingthehurricanesB.evaporatesandbecomesfuelC.headstowardlandD.turnsintowatervaporthatmakeshurricanesstronger3Whatresultcanregionalseasurfacetemperaturechangesproduce?A.Hurricanechanges.B.Increasinggreenhousegasemissions.C.Globalwarming.D.Destructivehurricanes.4Itcanbeinferredfromthepassagethat.A.thereisnolinkbetweengreenhousegasemissionsanddestructivestormsB.reductionofgreenhousegasemissionsmayreducedestructivestormsC.thehigherpercentageofstrongonesroseasmorehurricanesappearedD.pastrecordsonhurricanesincludedeverythingneeded
Asmallstudyofprofessionalsoccerplayersfoundthateventhosewhohaveneverexperiencedaconcussion脑震荡stillhavechangesinthewhitematteroftheirbrainsprobablyfromroutineandunprotectedheaders头球.Thebrain'swhitematterismadeupofnervesandtheirmyelin髓磷脂protectivecoatingthatplayanimportantroleinconnectingbrainareasandsettingupnervousnetworks.PreviousstudieshaveinvestigatedhowconcussionsleadtochangesinthiswhitematterbutanewstudyledbyDr.IngaK.KoerteofHarvardMedicalSchoolinBostonisoneofthefirsttolookathowevenblowstotheheadthataren'tconsideredconcussionsmayleadtobraininjury.InthestudytheresearcherscomparedbrainscansoftwelvemalesoccerplayersfromGermantop﹣levelsoccerclubswhohadnotexperiencedaconcussiontobrainscansofelevencompetitiveswimmerswhohadsimilarlyneverexperiencedrepetitivebraininjury.TheresearchteamuseddiffusiontensorimagingDTIwhichishighlyeffectiveatcatchingwhitematterchanges.Theresearchersfoundsurprisingchangesinthewhitematter.Eventhoughtheplayershadnoconcussionstheirbrainstoldadifferentstoryofdamageincludingchangestothemyelincoatingsurroundingnerves.'Althoughourstudyissmallitisthefirsttolookatsoccerplayerswithnosymptomsofconcussions'saysKoerte.'Wethinkitisanimportantfindingnotjustforsoccerplayersbutotherathletesofothersportstoo.''Ifplayersaredamagingtheirbrainsitisalargepublichealthissuebecauseeveryoneevenatayoungagehitstheirheadlikethis'saysDr.JeffreyBazariananassociateprofessorofemergencymedicineatauniversity.HewasnotinvolvedwiththestudybuthasalsousedDTItoassessmildbraininjuryinhighschoolfootballandhockeyplayers.Koertesaysmoreresearchisneededtogetabetterideaofhowpotentiallydamagingheadinjurycanbeatyoungages.IfitturnsoutrepetitiveheadblowsareharmingbrainfunctionsKoertesaysregulationslikestoppingplayingafterafixednumberofhitsmaybeneeded.Orheadingshouldn'tbeallowedatalluntilacertainage.ThestudyispublishedintheJournaloftheAmericanMeclicalAssociationJAMA.1Accordingtothestudysoccerplayersarelikelytobethreatenedby.A.sportsinjuriesB.routineheadersC.mildconcussionsD.fiercecompetition2Thestudyexplorestheconnectionbetween.A.concussionsandthewhitematterB.repetitiveheadblowsandbraininjuryC.thewhitematterandnervousnetworksD.nervesandtheirmyelinprotectivecoating3Howmanyplayerstookpartinthestudy?A.Eleven.B.Twelve.C.Twenty﹣three.D.Twenty﹣four4Dr.Bazarianseemstofeelthefindingsofthestudymaybe.A.importantB.interestingC.incorrectD.conflicting
硼氢化钠NaBH4是有机合成中常用的还原剂．一种制备硼氢化钠工艺如图部分条件和产物省略 已知MgH2NaBH4遇水蒸气剧烈反应并放出H2． 回答下列问题 1Mg2B2O5•H2O中B的化合价为．MgH2和NaBO2必须在干燥条件下合成硼氢化钠其原因是． 2难溶的Mg2B2O5与浓氢氧化钠溶液反应的离子方程式为． 3SOCl2溶于水能产生两种气体其中一种气体能使品红溶液褪色则灼烧时加入SOCl2的目的是． 4已知镁﹣H2O2酸性燃料电池反应为Mg+H2O2+H2SO4＝MgSO4+2H2O．常温下电解质溶液为200mL0.1mol•L﹣1硫酸溶液． ①写出正极的电极反应式． ②若电路中有0.038mol电子转移时则溶液pH约为忽略体积变化不考虑H2O2电离． 5“有效氢”是衡量含氢还原剂的还原能力指标定义为1g含氢还原剂的还原能力与多少克H2相当．NaBH4的“有效氢”等于结果保留2位小数． 6工业上可以利用NaBO2HCHO和生石灰在加热下生成NaBH4和难溶的盐写出化学方程式．
分子中只有两种不同化学环境的氢且数目比为32的化合物
假定你是高三学子李华在离高考还有一个月之际你给校报英语天地投稿给本校高三学生写一封建议信对考前一个月的英语学习生活等提出自己的建议.内容包括: 1学习方法心态调整; 2生活作息规律; 3表达祝福 注意:1.词数100左右;2.可以适当增加细节以使行文连贯. Deareditor AsaseniorofhighschoolIfindmanyofmyfellowstudentsarestressedandworriedabouttheirEnglishwhilepreparingforthecomingCollegeEntranceExamination. ThereforeI'dliketogivethemsomeadvice. Yours LiHua
下列各组物质性质的比较结论正确的是
砷和镍均为重要的无机材料在化工领域具有广泛的应用． 1基态As原子的核外电子的空间运动状态有种．与砷同周期的主族元素的所有基态原子中As的第一电离能排在正数第位． 2As的一种氧化物的化学式为As4O6请预测该氧化物一个分子中有个σ键该氧化物分子中As的杂化方式为． 3Na3AsO3中所含阴离子的立体构型为写出一种与其互为等电子体的分子的化学式． 4M可用于合成Ni2+的配体其结构为其所含σ键与π键数目之比为． 5基态Ni原子的价电子的电子排布图为． 6某砷镍合金的晶胞结构如图所示设阿伏加德罗常数的值为NA则该晶体的密度ρ为g•cm﹣3填字母． A.B.C．D.E.F.G.H.I.
下列化学方程式中不能正确表达反应颜色变化的是
已知HA的酸性强于HB的酸性．25℃时用NaOH固体分别改变物质的量浓度均为0.1mol•L﹣1的HA溶液和HB溶液的pH溶液的体积变化忽略不计溶液中A﹣B﹣的物质的量浓度的负对数与溶液的pH的变化情况如图所示．下列说法正确的是
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l0处多者从第11处起不计分. DearLiMei Withthemidtermexamcomeyoumustgetpreparedforit.Inmyopinionthatyouneedisarightstudymethod.Asweallknowtherearethreestageinstudy﹣previewstudyinclassandreviewamongthemreviewisthemostimportant.Youshouldfirstmakereviewplanandthensticktoit. Ifollowmyreviewplanstrictlyandhadmadeprogress.Itturnsouttobewellenough.Ofcoursetherearemanywaystoreview.SolongasyoureviewregularI'msurethatIcanfindmorewaystostudywell. IfyouhaveanyquestionsyoumayaskmeandI'mgladtohelpyou.WecanmeetinourschoollibraryineveryFridayafternoon. Bestregards. Yours LiHua
假定你是李华你校学生会创办的你最喜爱的英语月报EnglishMonthly向读者征集意见.请你给主编写封邮件内容包括: 1.自我介绍; 2.说明该报优点:内容丰富;指导英语学习; 3.提出建议:多介绍中国传统文化及励志故事. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
近年来我国科学家发现了一系列意义重大的铁系超导材料其中一类为Fe﹣Sm﹣As﹣F﹣O组成的化合物．回答下列问题 1元素As与N同族．预测As的氢化物分子的立体结构为其沸点比NH3的填“高”或“低”其判断理由是． 2Fe成为阳离子时首先失去轨道电子Sm的价层电子排布式4f66s2Sm3+价层电子排布式为． 3比较离子半径F﹣O2﹣填“大于”“等于”或“小于”． 4一种四方结构的超导化合物的晶胞如图1所示．晶胞中Sm和As原子的投影位置如图2所示． 图中F﹣和O2﹣共同占据晶胞的上下底面位置若两者的比例依次用x和1﹣x代表则该化合物的化学式表示为通过测定密度ρ和晶胞参数可以计算该物质的x值完成它们关系表达式ρ＝g•cm﹣3． 以晶胞参数为单位长度建立的坐标系可以表示晶胞中各原子的位置称作原子分数坐标例如图1中原子1的坐标为则原子2和3的坐标分别为．
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WantawonderfultravelinLondon?Don'tmissthefollowing!CartoonMuseumThishighlyentertainingLondontouristattractioncoversthehistoryanddevelopmentofBritishcartoonsfromthe18thcenturytothepresentday.Youcanfindadetailedcollectionofalltypesofcartoonsinthismuseumincludingcaricatures讽刺漫画andrareexamplesofcartoonart;it'sanidealplacetoentertainkidsofallagesaswellasaseriouscollectionforanimationenthusiasts.Thereareoverninehundredpiecesonexhibitandthemuseumregularlyholdseventswherebothchildrenandadultscanparticipate.BookingfortheseeventsisrecommendedduetothepopularityyearroundofthisLondonMuseum.Telephone:02075808155ChislehurstCavesChislehurstinLondonishometochalkcavesthatwereminedbyhandforover8000years.AtourofthesecavesisanexcitingwaytoseehowBritishpeoplehaveimpactedontheirenvironmentoverthousandsofyears.Telephone:02084673264TheOldOperatingTheatreMuseumTheOldOperatingTheatreMuseumisoneLondonmuseumofferingafascinatinginsightintothemedicalprofessionofthepast.This300﹣yearoldherbgarret阁楼isBritain'sonlysurvivingoperatingtheatrewithawoodenoperatingtableandanobservationstandfromwhichvisitorscanwitnesssurgeryperformed.Telephone:02071882679CurzonMayfairCinanaMuseumRecentlyvotedoneofLondon'sbestcinemasbyTimeOutreaderstheCurzonMayfaircinemaiseverythingyouwouldexpectfromthisparticularpartoftown:luxurious奢华的andtasteful.Showingmostlyart﹣houseandindependentfilms.theCurzonMayfairisuniqueintheworldofLondoncinemaforitsroleinscreeningthesefilmsforindustryandpress.Telephones033332101041WhatcanwelearnfromtheCartoonMuseum?A.Itisdesignedonlyforkids.B.ItistheoldestcartoonmuseuminBritain.C.Visitorscantakepartintheactivitiesheldinit.D.Onemustbookthemuseuminadvancetovisitit.2Whichwillyoucallupifyou'dliketoknowsurgeryofthepast?A.02075808155・B.02071882679.C.03333210104.D.02084673264.3Whichofthefollowingmayattractanaturelover?A.ChislehurstCaves.B.CartoonMuseum.C.CurzonMayfairCinemaMuseum.D.TheOldOperatingTheatreMuseum.
Visuallanguageisaformofcommunicationthatusesvisualelements元素asopposedtoformalwrittenlanguagetoconveymeaningoranideaGraphicacytheabilitytocommunicatevisuallyisconsideredasimportantasliteracyandnumeracytheabilitiestoreadandcount.Somepeoplearevisualthinkersusingthatpartofthebrainthatisemotionalandcreativetoprocessandgivemeaningtoinformation.Visualcommunicationcanfindexpressioninpaintingsdrawingssymbolsorsimplylinesandshapesarrangedforaspecificeffect.Artisanexampleofvisuallanguage.Apaintingorsculpturecanconveyideasorarousespecifickindsofemotionalresponses.Itmayalsoexpressideasabouthistoricaleventsabstractconceptsorsimplybeaboutthewaycertainshapesorforms'work'togetherorcreateacertaineffectonthemind.Someresearchersbelievethatdifferentpartsofthebrainrespondinuniquewaystocolorsandshapes.Pictograms象形文字andideograms表意文字aretypesofvisuallanguage.Pictogramsarepicturesthataresimilartowhattheyrepresent.Theyarestillusedtodaytocommunicateinformation.Manypeoplearoundtheworldarefamiliarwiththepictogramsindicatingsuchthingsasairportspublicfacilitiesandnon﹣smokingareasindicatedbyacigaretteinacirclewithalineacrossit.Ideogramsarepicturesthatrepresentideasandcanoftenbeunderstoodwithouttheaidofwrittenlanguage.SomescholarstrackmodernalphabetstopicturesLettersareactuallyancientpicturesandwordsareaseriesofpictures.Modernalphabetlettersarenotonlyphonetic语音的symbolsbutarebasedonancientreligiousimagesandsymbols.Musivisualcommunicationisalsoapartofvisuallanguage.Thetermreferstomusiccreatedspecificallytoimprovethevisualexperienceoffilm.Itcorrespondstotheimagesbeingseenonthescreenandthemusicmayarouseasenseofterrorfearorotheremotions.Mostmoviegoersunderstandthelanguageofmusicalcluesshowingthatsomethingdramaticorimportantisabouttohappen.1Whatisvisuallanguageaccordingtothetext?A.Anideaconveyedbyartists.B.Anabilitytoreadandcount.C.Asystemusedtoarouseemotions.D.Awayofprocessingandexpressinginformation.2Whatmaybetheoriginofthemodernalphabetletters?A.Publicfacilities.B.Imaginarylines.C.Religiousimages.D.Livingconditions.3Whatcanwelearnaboutthemusicofafilmfromthelastparagraph?A.Itcanhelppredicttheplot.B.Avisualthinkercanmakeitbetter.C.Itoftenchangeswithouttheaudience'snoticeD.Itmakesthefilmmoreemotionalandcomplex.4Whatcanbethebesttitleofthetext?A.HowdoesVisualLanguageAffectLife?B.HowcanWeLearnVisualLanguage?C.WhatIstheOriginofLanguage?D.WhatIsVisualLanguage?
FormepersonallyIcouldwritefordaysaboutmanydifferentsituationswhereadversity逆境1mylife.NowletmetellyouoneexperiencewhereIalmostletadversity2.Wehadaglassstudiowhichwaslocated50feetfromourhome.Acoupleofyearsagoweexperiencedan3winter;wehadalotofsnowandice.The4oftheiceandsnow5theroofonourstudiotakingwithitoneofoursourcesofincome.6itdidfalldownwegotontheroofandtriedto7thesnowandicebutwhenyouhave5feetoficeandtemperaturesofminus20Celsiusitwaspretty8todo.Wehadapartnercomeintohelpustryto9theroofbysupporting.Intheendtherewas10thatcouldbedone.Theroofcamedown.Wehadmovedalotofourgoodsandtoolsfromthestudio11welostalotalso:glasskilnsworkbenchestonameonlyafewoftheitems.Itwasa12experience.Herewewereinthemiddleofwinterwithourstudiocollapsed.Wecouldn'tworkaswehadalmost13allthematerialsinabuildingwewerenotusing.Wecouldhavedoneoneofthetwothings:wecouldsimplysaythatwecannolonger14ourglassbusiness.Letmetellyouthatthiswascertainlythoughtthat15ourmind.Orwecouldfindawaytogetourstudiobackupandrunning.Wepickedthe16option.Wehadalargebarnthatwewerenotusing.Sowerenovated翻新thebarn17ourworkingareaandtodaywehaveanicerstudiothanwe18had.Iftheadversitywewere19hadnothappenedweprobablywould20beworkingintheoldstudio﹣astudiothatwaslessefficient.1A.influenced B.promoted C.protected D.prevented2A.suffer B.escape C.work D.win3A.awful B.wonderful C.aware D.awkward4A.size B.height C.temperature D.weight5A.limited B.destroyed C.pressed D.struck6A.Unless B.Before C.Although D.When7A.remove B.reduce C.recycle D.replace8A.worthwhile B.rewarding C.tough D.annoying9A.examine B.test C.restore D.secure10A.nothing B.enough C.all D.something11A.for B.or C.but D.so12A.vain B.happy C.exciting D.disastrous13A.displayed B.arranged C.presented D.piled14A.predict B.inform C.conduct D.quit15A.approached B.cleared C.crossed D.comforted16A.former B.latter C.easier D.further17A.evaluated B.organized C.redesigned D.reserved18A.previously B.hopefully C.eventually D.desperately19A.concernedabout B.facedwith C.cautiousabout D.awareof20A.still B.ever C.even D.already
Atouringdigitalexhibitionofaformeremperors'residenceistokickoffinlateApriltheBeijing﹣sPalaceMuseumalso1knowastheForbiddenCityandShenzhen﹣basedculturalcompanyArtronannouncedonFriday.Theexhibitionwillusevirtual2real.andartificialintelligenceamongmanyothertechnologiesto3wellintroducethefruitsofacademicresearchonYangxinDiantothepublic4digitallypresentingtheabundantcollectionofculturalrelicsandofferinteractiveexperiencestovisitors.Thehallbuiltinthemid﹣16thcenturyduringtheMingDynastywasalso5residenceoflasteightemperorsoftheQingDynasty.Anditisoneofthemostimportant6buildintheForbiddenCity7wasChinasimperialpalacefrom1420to1911.YangxinDian8shuttothepublicsinceDecember2015foramajorrenovation维修.HoweveritsculturalrelicshavebeenexhibitedincitieslikeShenzhenandHongKong.Therenovationistolastuntil2020.Meanwhile9offeramorelmmersiveexperiencetovisitorsthePalaceMuseumdevelopedthedigitalexhibitionin2017presentedinthemuseum'sdigitalgallery.In2018itwasshownattheArtronArtCenterinShenzhenattractingabout10000visitorsovertwomonths.TheupcomingexhibitiontourwillstartfrominL+MallinShanghai10thelaterdestinationsofthetourhaven'tbeenannounced.
化学来源于生活也服务于生活下列有关生活中的化学叙述正确的是
SignsofEatingDisorderAbout30millionAmericanslivewithaneatingdisorder.1Yetmanyothersareoftenhiddeninplainsight.It'simportanttoknowthesymptomsinthosewhomightbeatriskforaneatingdisorder.They'reconstantlytalkingaboutdieting.Thediscussionaroundchangingeatinghabitsisincrediblycommon.Lookatanylifestylemagazineorwebsiteandyou'lllikelyfinddietingtipsandadvice.2Ifsomeoneyouloveisconstantlytalkingaboutfoodortheirdietinghabitsitmightbeasignofconcern.3Changesinmoodorbehaviorssurroundingfoodorexercisecanbesignsofconcern.Thiscouldmeanaswitchinactivitylevellikeoverexercisingtoooftencountingcaloriesfrequentlyvisitingthebathroomaftereatingfastingoreatingtoomuch.4They'reconstantlyturningdownfood﹣centricsocialgatherings.Avoidingsocialinteractionssuchasbirthdaypartiesorgoingouttodinnerwithfriendsisasignificantdangersignal.Peoplelivingwiththeconditionhaveanintensefocusonfoodorbodyimage.Theywillkeepawayfromsituationslikelyonesthatoncebroughtthemjoy﹣wherethatdeterminationmightbetested.Thebestwaytosupportsomeonewhomaybeexperiencinganeatingdisorderisbytalkingwiththembutwhenandhowyoudoitmatters.5Approachthemwithloveandcompassionletthemknowthatyoucareaboutthemandthatyounoticethatthereissomethingtheymaybestrugglingwith.A.Thisalsomightcomewithanoticeableweightlossorgain.B.Howeverbeingtrappedinthatdiscussionisadifferentstory.C.Theirfitnessoreatinghabitsareconstantlyoutoftheordinary.D.Moodchangesassociatedwitheatingmayalsobeadangersignal.E.Itshouldbeawayfromthenormalroutineandoutsideofamealtime.F.Somesymptomsofaneatingdisordermaybemorevisibletotheeyes.G.Eatingdisordersareagroupofconditionsmarkedbyanunhealthyrelationshipwithfood.
如图某工厂用NO气体制取NH4NO3溶液下列说法正确的是
今年是门捷列夫发现元素周期律150周年．下表是元素周期表的一部分WXYZ为短周期主族元素W与X的最高化合价之和为8．下列说法错误的是
环戊二烯是重要的有机化工原料广泛用于农药橡胶塑料等生产．回答下列问题 1已知g═g+H2g△H1＝100.3kJ•mol﹣1① H2g+I2g═2HIg△H2＝﹣11.0kJ•mol﹣1② 对于反应g+I2g═g+2HIg③△H3＝kJ•mol﹣1． 2某温度下等物质的量的碘和环戊烯在刚性容器内发生反应③起始总压为105Pa平衡时总压增加了20%环戊烯的转化率为该反应的平衡常数Kp＝Pa．达到平衡后欲增加环戊烯的平衡转化率可采取的措施有填标号． A．通入惰性气体B．提高温度C．增加环戊烯浓度D．增加碘浓度 3环戊二烯容易发生聚合生成二聚体该反应为可逆反应．不同温度下溶液中环戊二烯浓度与反应时间的关系如图所示下列说法正确的是填标号． A．T1＞T2 B．a点的反应速率小于c点的反应速率 C．a点的正反应速率大于b点的逆反应速率 D．b点时二聚体的浓度为0.45mol•L﹣1 4环戊二烯可用于制备二茂铁FeC5H52结构简式为后者广泛应用于航天化工等领域中．二茂铁的电化学制备原理如图所示其中电解液为溶解有溴化钠电解质和环戊二烯的DMF溶液DMF为惰性有机溶剂． 该电解池的阳极为总反应为．电解制备需要在无水条件下进行原因为．
Bootcamp﹣stylefitnessclassesaretakingNewYorkCitybystormandevensoldierssaysomeoftheseexercisesareharderthanthebasictrainingtheyexperienced.Theseclassescondense压缩90daysoftrainingintoanhour﹣longclass.'It'smuchmorechallengeableinthatyoudon'thaveabreak'saysChadVincent37.Soifyouwantaworkoutthatwillhelpyoubeallyoucanbeherearesomegoodchoices:CircuitofChange57W.16thSt.212255﹣0053Thebase:Thisclass﹣foundedbyBrianDelmonicoin2011﹣helpsNewYorkersfindpeaceofmind.Marchingorders:Theone﹣hourfocusdoesn'tmeanyouwon'tsweat.Expectamixofgymnasticsandyogaindoorswhileoutdoorclassesincluderunningandjumpingoverbenchesandasmallwall.WarriorFitnessBootCamp29W.35thSt.212967﹣7977Thebase:Monkeybarsandhangingropesdecoratethisspacewhereacrewoffivenot﹣afraid﹣to﹣shoutinstructorsdohelp.Marchingorders:ThisworkoutmodeledafterrealbootcampsisasauthenticasitgetsaccordingtoformerMarineSgt.海军中士RubenBelliard.'Westaytruetothefactthatthisiswhatwewentthrough'hesays.Classesincludeaseriesof90﹣seconddrillsthatrequireteamworktocomplete.Stacy'sBootCamp646537﹣5466;stacysbootcamp.comThebase:StacyBermanturns17yearsofkickboxingexperienceintoaseriesofoutdoorbootcampsinCentralParkandBatteryPark.Marchingorders:ThreeweeklyclassesstartintheearlymorningaccordingtoLieslMarelli.Uncertaintyisabigpartoftherecipe.'Youdon'tknowwhatshe'sgoingtothrowatyouthatday'saysMarelli.BrickNewYork257W.17thSt.;bricknewyork.comThebase:ThispopularLosAngelesCrossFitgymopenedthismonthandinstructorWillLanierisalreadybeginningtotrainNewYorkerswithbootcamp﹣stylerunsandoutdoorworkouts.Marchingorders:ThelO﹣minutewarm﹣uprunwillfeeleasybeforeLanierstartshis'60﹣minuteworkout.'AlsodifferentformbootcampBrickwillsoonofferyogaclasses.1WhatisspecialaboutStacy'sBootCamp?A.Ithelpstofindinnerpeace.B.Thewarm﹣upactivityiseasy.C.Ithasaveryflexibleschedule.D.Theinstructorsareextremelystrict.2Whichofthefollowingclassesneedsmoreteamspirit?A.WarriorFitnessBootCamp.B.Stacy'sBootCamp.C.CircuitofChange.D.BrickNewYork.3Whatisthepurposeofthetext?A.Toencouragereaderstodomoreindoorexercises.B.Torecommendseveralbootcamp﹣stylefitnessclasses.C.Topersuadereaderstojoinbootcamp﹣stylefitnessclassesD.Tointroducetheadvantagesofbootcamp﹣stylefitnessclasses.
用如图所示装置进行下列实验将①中溶液滴入②中预测的现象与实际相符的是
Thewaypeopleholdtothebeliefthatafun﹣filledpain﹣freelifeequalshappinessactuallyreducestheirchancesofeverattainingrealhappiness.Iffunandpleasureareequaltohappinessthenpainmustbeequaltounhappiness.Butinfacttheoppositeistrue:moreoftenthannotthingsthatleadtohappinessinvolvesomepain.Asaresultmanypeopleavoidtheveryattemptsthatarethesourceoftruehappiness.Theyfearthepaininevitablybroughtbysuchthingsasmarriageraisingchildrenprofessionalachievementreligiouscommitmentselfimprovement.Askabachelorwhyheresistsmarriageeventhoughhefindsdatingtobelessandlesssatisfying.Ifheishonesthewilltellyouthatheisafraidofmakingacommitment.Forcommitmentisinfactquitepainful.Thesinglelifeisfilledwithfunadventureexcitement.Marriagehassuchmomentsbuttheyarenotitsmostdistinguishingfeatures.Coupleswithinfantchildrenareluckytogetawholenight'ssleeporthree﹣dayvacation.Idon'tknowanyparentwhowouldchoosethewordfuntodescriberaisingchildren.Butcoupleswhodecidenottohavechildrenneverknowthejoysofwatchingachildgrowuporofplayingwithagrandchild.Understandingandacceptingthattruehappinesshasnothingtodowithfunisoneofthemostliberatingrealizations.Itliberatestime:nowwecandevotemorehourstoactivitiesthatcangenuinelyincreaseourhappiness.Itliberatesmoney:buyingthatnewcarorthosefancyclothesthatwilldonothingtoincreaseourhappinessnowseemspointless.Anditliberatesusfromenvy:wenowunderstandthatallthosewhoarealwayshavingsomuchfunactuallymaynotbehappyatall.1Accordingtotheauthorabachelorresistsmarriagechieflybecause.A.heisreluctanttotakeonfamilyresponsibilitiesB.hebelievesthatlifewillbemorecheerfulifheremainssingleC.hefindsmorefunindatingthaninmarriageD.hefearsitwillputanendtoallhisfunadventureandexcitement2Raisingchildrenintheauthor'sopinionis.A.amoraldutyB.arewardingtaskC.athanklessjobD.asourceofinevitablepain3Fromthelastparagraphwelearnthatenvysometimesstemsfrom.A.HatredB.misunderstandingC.PrejudiceD.ignorance4Whatistheauthortryingtotellus?A.Happinessoftengoeshandinhandwithpain.B.Onemustknowhowtoattainhappiness.C.Itisimportanttomakecommitments.D.Itispainthatleadstohappiness.
“春蚕到死丝方尽蜡炬成灰泪始干”是唐代诗人李商隐的著名诗句．下列关于该诗句中所涉及物质的说法错误的是
分子式为C4H8BrCl的有机物共有不含立体异构
Arecentstudyfoundthatpeoplewholiveincolderclimatesconsume1muchalcoholthanpeoplewholiveinwarmweather.'Alcoholissomethingthateveryonethoughtharmfulfor2decadebutnoonehasscientificallydemonstratedit'aprofessorwroteinapressrelease.WhydopeopleinRussiadrinksomuch?Everybody3assumethat'sbecausetheweatheriscold.Butwecouldn'tfindasinglepaper4linkclimatetoalcoholintake.Sincealcoholcouldincreasewarmbloodflowintheskinlastmonththeresearchersinastudy5suggestthatpeopleshouldreachforbooze豪饮whenit'scoldoutside.Theresearcherscombedthroughdatatocompareclimatefactorsandalcoholconsumptionpercapita每人的.6studyalsofoundthatastemperaturesandsunlighthoursdecreasealcoholconsumptiongoesup.Shorterhoursofsunlightandcoolertemperaturesalsorelate7higherratesofdepression8islinkedtoanincreaseindrinking.Theprofessorhopesthisdatawillhelpinfluencehealthpoliciesonalcoholabuse.'Knowingthatcolderplaceshavemoredrink﹣relatedproblemscouldbe9helptotheeffortsintheseareas10determinebetterpolicies'hesaid.
由γ﹣羟基丁酸生成γ﹣丁内酯的反应如下 在298K下γ﹣羟基丁酸水溶液的初始浓度为0.180mol•L﹣1测得γ﹣丁内酯的浓度随时间变化的数据如表所示．回答下列问题 1该反应在50～80min内的平均反应速率为mol•L﹣1•min﹣1． 2120min时γ﹣羟基丁酸的转化率为． 3298K时该反应的平衡常数K＝． 4为提高γ﹣羟基丁酸的平衡转化率除适当控制反应温度外还可采取的措施是
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