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研究岁…9∩92年並届点女BritishLibrary(London)fireItwascreatedin1972;previously,thelibraryhadbeenpartoftheBritishMuseum,24.wherethefamouscircularreadingroomhadaccommodatedresearchersincludingKarlMarx,whoworkedon"DasKapital"there,aswellasOscarWideandMahatmaGandhi.TheBritish25,LibraryisnowhousedinanewbuildinginSt.Pancras,London,whereitstreasuresincludetwoGutenbergBibles,oneofLeonardodaVinci'snotebooksandsoon.NationalDietLibrary(Tokyo)26Itopenedin1948.UntiltheSecondWorldWarandthesubsequentAmericanoccupation,Japandidnothaveanationalpubliclibrary.TheDietLibrarywasestablishedbecausepublicaccesstoinformationwasseenasavitalpartofthepost-wardemocratization()2process.Itservesasanationallibrary,holdingcopiesofeverybookpublishedinJapanese.RussianStateLibrary(Moscow)Foundedin1862astheMoscowpubliclibraryandmuseum,thiscollectionbecametheStateLibraryin1925.Likemanynationallibraries,theRussianStateLibraryhasencounteredrepeatedproblemsofspaceshortage,andhashadtomovesectionsofitsholdingstorepositories(贮藏处)elsewhere.21.WhoserealnotesarecurrentlycollectedintheBritishLibrary?A.Napoleon's.B.KarlMarx's.C.LeonardodaVinci's.D.MahatmaGandhi's.22.Whichlibrarywasthesideeffectofpost-wardemocratization?A.TheBritishLibrary.B.TheRussianStateLibrary.C.TheNationalDietLibrary.D.BibliothequeNationaledeFrance.23.WhyarethebooksintheRussianStateLibrarypreservedelsewhere?A.Thelimitedstoragespace.B.Thedemandfromthepublic.C.Thereconstructionofthelibrary.D.Thedevelopmentoftheelectronicbook.BSavingadrowning()womanisallinaday'sworkfortwoboyswhohadalreadycollectedtheirswimmingandlife-savingmeritbadges().AJuneheavystormhitColumbiainMissouriwithlittlewarning,causingfloodwatersfromriverstobursttheirbanksandoverflowzonestoturnintoponds.When15-year-oldDominicVietand16-year-oldJosephDienerpassedabasketballcourtthathadturnedintoapool,theyheardthefranticshoutingofayoungwomandesperatelytryingtokeepherheadabovewaterundertheforceofacurrent.Theboyshadseenthegirlswimmingwithafriendtherebefore,butitwasnowobviousshewasdrowning."Thefirstthingthatcameintomymindwastogetintothewater,"Dominicrecalled."Wedidn'thavetimetothink.Herheadwasbarelyabovethewaterandwecouldseehersinkingmoredowneverysecond.Wedidn'tthinkabouttherisks.Wehadtogetherout.Heroeswilldoasheroesdo.Pullingherupontotheirshoulders,DomandJosephgotherashore,whereemergencyservicesarrivingatsomeoneelse'scallperformedfirstaidandrushedhertothehospital.Peopleshouldn'tswiminfloodwaters.Therecanbewastewaterrunoff,loosechemicals,downedpowerlineschargingthecurrentwithelectricity,orpiecesofwood,metal,orbrick,etc.【2023年分科诊断测试卷（六）·英语第3页（共8页）】

7.如图所示,竖直平面内三根等长的光滑杆构成三角架,BC杆水平放置。质量均为m的两个小球通过一不可伸长的轻质细绳相连后,分别套在AB3、AAC两杆上,在图示位置细绳处于水平状态,两小球保持静止状态。现将三角架绕B点在竖直平面内沿逆时针方向缓慢转动,直到AB杆竖直,重力加速度为g,,则下列说法正确的是A.BC杆水平时,AB、AC两杆对小球的弹力大小均为mgB.B杆水平时,细绳上的拉力大小为3mg3C.AB杆对小球的弹力先增大后减小D0AC杆对小球的弹力一直增大

1.我国是世界上最早发现磁现象的国家,而早在战国末年就有磁铁的记载,中国古代的四大发明之一的司南(指南针)就是其中之一,指南针的发明为世界的航海业做出了巨大的贡献.关于磁现象,下列说法正确的是A.安培发现了磁场对运动电荷的作用规律,洛伦兹发现了磁场对电流的作用规律B.地球磁场的N极在地理的南极附近,地球周围的磁感线是抽象出来的,并不真实存在C.电场线一定是闭合的,磁感线一定是不闭合的D.磁感线上每一点的切线方向都跟该点的磁场方向垂直

7.如图所示,交流电源输出电压为u=Umsin(100πt)V,理想变压器原、副线圈匝数比为u=Um(100t)V,U=n1:n2=1:2,R1=2.5,R2=10,R3=200,:n2=1:2,定值电阻R=2.5Ω,R=100,R,=200Ω,电动机M的额定电压为200V,额定电流为I=1A,内阻r=20Ω,已知电动机正常工作,则变A.交流电源输出电压Um为1202^-VB.电动机正常工作时的效率为80%C.若电动机被卡住,则电动机与R2两端电压之比为2:1D.若电动机被卡住,则副线圈两端电压的有效值为1.2507V