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如图所示，在矩形区域ABCD内有一垂直纸面向里的匀强磁场，AB＝5cm，AD＝10cm，磁感应强度B＝0.2T．在AD的中点P有一个发射正离子的装置，能够连续不断地向纸面内的各个方向均匀地发射出速率...
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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
如图所示的平行板器件中存在相互垂直的匀强磁场和匀强电场磁场的磁感应强度B.1=0.40T.方向垂直纸
如图所示在垂直于纸面的足够大的匀强磁场中有一个闭合的矩形线框abcd线框平面与磁场垂直下列哪种情况可
线框沿纸面向右加速运动
线框垂直纸面向外运动
线框绕ad边转动
线框绕过d点与纸面垂直的轴，沿纸面顺时针转动
如图所示在垂直于纸面的范围足够大的匀强磁场中有一个矩形闭合线框abcd线框平面与磁场垂直在下列哪种情
线框沿纸面向右加速运动
线框垂直纸面向外运动
线框绕ad边转动
线框绕过d点与纸面垂直的轴，沿纸面顺时针转动
14分某科研小组的隐形技术可等效为下面的模型如图所示在y>0的区域内有一束平行的α粒子流质量设为M.
如图所示区域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度为B
如图所示在第一象限内有垂直纸面向里的匀强磁场一对正负电子分别以相同速率沿与x轴成30°角的方向从原点
如图所示半径为R.的圆形区域内有垂直于纸面向里的匀强磁场磁感应强度为B.若在圆心O.处有一个质量为m
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
电阻为R.的矩形导线框abcd边长ab=lad=h质量为m自某一高度自由落下通过一匀强磁场磁场方向垂
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
如图所示一足够长的矩形区域abcd内充满磁感应强度为B.方向垂直纸面向里的匀强磁场现从矩形区域的ad
如图所示的无限大的匀强磁场中有一个矩形线圈ａｂcｄ做下述运动其中线圈中磁通量发生变化的是
以ｂc为轴转动
以ａｂ为轴转动
垂直纸面向里匀速运动
在纸面内向下运动
如图所示匀强磁场方向垂直纸面向里一带负电的粒子不计重力由右方垂直磁场方向射入磁场中在匀强磁场的作用下
向上
向下
向里
向外
在水平面上有一固定的U形金属框架框架上放置一金属杆ab如图所示纸面即水平面.在垂直纸面方向有一匀强磁
一正电荷垂直射入匀强磁场中其速度v的方向和受到的洛伦兹力F.的方向如图所示则磁场方向
与F.方向相同
与F.方向相反
垂直纸面向外
垂直纸面向里
如图所示虚线区域内有垂直于纸面向里的匀强磁场一单匝正方形导线框垂直磁场放置框的右边与磁场边界重合现将
如图所示在直角区域aOb内有垂直纸面向里的匀强磁场一对正负电子质量和电荷量分别相等电性相反从O.点沿
如图所示一个有界的匀强磁场区域方向垂直纸面向里一个矩形导线框abcd沿纸面由位置I匀速运动到位置II
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25分假如你是李华上周在外教Mr.Jackson的口语课上使用手机被老师发现手机被收走.请给外教写一封道歉信内容应包括以下要点 1.表示歉意 2.解释上课使用手机的原因 3.提出自己的请求并适当表态. 注意1.可适当添加细节使文章连贯字数100左右 2.信的开头和结尾已给出不计入总词数. DearMr.Jackson Yourssincerely LiHua.
函数fx＝4﹣x0+lg的定义域是
8分OnacoldMarcheveningin2014inLucedaleMississippiAnnBoschethen53stoodonherfrontstepswhileherminidachshundGracieLookabathroombreak.Graciesniffedanunwelcomevisitorunderthecamelliabush山茶花树andbarked.Annbentandsawapairofgreeneyes. HellothereAnnsaidandheardameowinreply.AnnwhohadtworesidentcatsBoscoandJuniorwentinside.Shereturnedwithabowlofcatfoodandsliditbeneaththebush. Thenextnightthecatreturned.Annfedhimagainmovingthebowlclosertothehouse.Afteraweekthemysterycatshowedhimself.Hewaslong﹣hairedwickaplume羽毛状oftailendedbyawhitetip.AnncalledhimMr.FancyorFancyforshort. SoonMr.Fancywaswalkinginandoutofthecatdoor.HoweverAnn'shusbandGenearguedthatFancyshouldfindanewhome.Wedon'tneedanothermouthtofeedandvetbillsareexpensivehesaid.Reluctantly勉强的Annagreed. Thedrivetotheanimalshelterwasheartbreaking.Anncried.HersonJimmycried.ShecomfortedJimmybysayingHe'ssobeautifulandlovable.Somebodywillwanthim. AmonthlaterAnnwoketothesoundofGene'svoice.Shewenttoseewhichanimalhewastalkingto﹣andsawawhite﹣tippedtail.AthinnerFancyranacrosstheroomtoher. WhensheaskedtheshelterwhathadhappenedshelearnedthatFancyhadescaped20minutesaftershehadleftwhenaworkeropenedthecagetofeedhim.Somehowoverthenextmonthhe'snavigatedthethreemiles﹣travellingalongrailroadtracksbusystreetsandneighborhoods﹣backtotheBosches. HeismeanttohehereAnnsaid.EvenGeneagreedWhatevertimeIhavewithhimAnnsaidthey'regoingtobethebestyearsofhislife. 5.WhoisGracie? A.Ann'sdog. B.Ann'schild. C.Ann'shousekeeper. D.Ann'scat. 6.WhydidGenethinkFancyshouldfindanewhome? A.OthertwocatsmayfightagainstFancy. B.Fancyissolovablethatsomeonewillwanthim. C.Fancyiswalkinginandoutregardlessofotherpets. D.ToraiseFancywillburdenthemwithmarebills. 7.TheunderlinedwordHeinthelastparagraphrefersto. A.Gene B.Jimmy C.Fancy D.Bosco 8.WhichwordcanbestdescribeAnnBosche? A.Generous. B.Compassionate. C.Merciless. D.Selfish.
已知集合A＝{﹣12}B＝{x|ax＝1}若B⊆A则由实数a的所有可能的取值组成的集合为
如图是在某学校举行的运动会上七位评委为某体操项目打出的分数的茎叶图去掉一个最高分和一个最低分后所剩数据的方差为．
已知定义在R上的奇函数fx满足fx+2＝﹣fx当0≤x≤1时fx＝x2则f1+f2+f3+…+f2019＝
函数fx的定义域为D若fx满足在D内是单调函数且存在[mn]⊆D使fx在[mn]上的值域为[]那么就称y＝fx为“半保值函数”若函数fx＝logaax+ta＞0且a≠1是“半保值函数”则正实数t的取值范围是
30分DuringtheAprilsuperstormmyfaithinpeoplewasrestored.OnApril20Idecidedto21intotowntobuygroceriesduringabreakintherain.22asIdrovehacktomyhomethe23tookaturnfortheworse.Itwasrainingvery24.ApproachingmysuburbIhadnowheretogoasthewaterlevelontheroad25infrontofme. Amaninhisfrontyardwavedtometo26inhisdriveway汽车道whichwasawayfromthefloodwaters.Themanwho27himselfasTrentthenurgedmetowaitinsidehishouse.ItoldhimIwas28aboutthedamagetomycarastherainstartedto29hail冰雹.Trentthengrabbedacoverandcoveredmy30.Hewastotally31butdidn'tmindbeingoutintherain32.Fortunatelymycarwassavedthankstohis33. By11amtheelectricityandphoneserviceshadgoneandIcouldn'treachmyparentsdespiteknowingtheywouldhe34.Trentmademecupofteaandgavemea35todrymyselfoff.By1230pmtherainhadabated减弱soIaskedTrent36hethoughtitwouldbe37enoughtoleave﹣heassuredmeltwas.AsIleftIinsistedontakingtwoofhisbusinesscardstorewardhiminthefuture. Trentwasso38asIthankedhimforhishelp.IwasveryheartenedbyTrent's39anditrenewedmy40inpeople. 21.A.move B.leave C.drive D.return 22.A.Therefore B.However C.Otherwise D.Moreover 23.A.weather B.car C.mad D.comer 24.A.thick B.hard C.heavily D.severely 25.A.rushed B.flooded C.trapped D.rose 26.A.shelter B.travel C.park D.occupy 27.A.introduced B.regarded C.pretended D.saw 28.A.concerned B.certain C.encouraged D.disappointed 29.A.looklike B.comefrom C.turninto D.bringabout 30.A.truck B.tractor C.bus D.car 31.A.weak B.exhausted C.willing D.wet 32.A.onmybehalf B.infavorofme C.inthenameofme D.onmyside 33.Apromise B.patience C.efforts D.skills 34.Adisappointed B.worried C.satisfied D.excited 35.Araincoat B.umbrella C.towel D.shirt 36.A.if B.when C.why D.how 37.A.able B.fortunate C.easy D.safe 38.A.modest B.confident C.lucky D.generous 39.A.encouragement B.determination C.kindness D.wisdom 40.A.passion B.trust C.impression D.respect
设函数fx＝ax2+bx+ca＞0且f1＝﹣． 1求证函数fx有两个零点 2设x1x2是函数fx的两个零点求以|x1﹣x2|的取值范围 3求证函数fx在区间02内至少有一个零点．
15分Mysix﹣year﹣oldgranddaughterstaresatmeasifsheisseeingme61thefirsttime.Grandmayouareanantiquebecauseyouareoldshesays.IexplainAnantiqueisnotonlyjustoldit'sanobject62belongtoearliertimes.Antiquesarevaluable. Welookaroundthehouseforantiques.Thereisalargedeskthat63handdownfromanaunttoourfamily.It'sveryoldItellJenny.Itrytokeepit64polishandIshowitoffwheneverIcan.WhenJenny65getolderImightalsotellherthatwheneverIlookatthedeskortouchitIamremindedoftheauntwhowasdeartome.Iremembermyselfasalittlegirlstandingagainstthisantique68listentooneofherstories. Ourtourofantiquescontinues.Thereisapictureonthewall67datesfrom1867anditisnotinverygoodcondition.Thereisavaseonthefloor.I'mnotcertainwhereitcamefrom68Ididn'tbuyitnew.TheonethingaboutantiquesIexplaintoJennyisthattheyusuallyhaveastory. ForamomentJennylooks69thought.Idon'thaveanyantiquesbutyoushesays.Then70shefacebrightens.CouldItakeyoutoschoolforourantiquesshow?
设＝﹣11＝43＝5﹣2． 1若+t∥求实数t的值 2若+t⊥求实数t的值．
某校举行汉字听写比赛为了了解本次比赛成绩情况从得分不低于50分的试卷中随机抽取100名学生的成绩得分均为整数满分100分进行统计请根据频率分布表中所提供的数据解答下列问题 1求ab的值 2若从成绩较好的第345组中按分层抽样的方法抽取6人参加市汉字听写比赛并从中选出2人做种子选手求2人中至少有1人是第4组的概率．
如果函数fx＝x2﹣a﹣1x+5在区间上是减函数那么实数a的取值范围是
设函数fx＝x+1ex+1则
要完成下列两项调查①从某社区125户高收入家庭280户中等收入家庭95户低收入家庭中选出100户调查社会购买力的某项指标②从某中学的15名艺术特长生中选出3人调查学习负担情况宜采用的抽样方法依次为
已知定义在R上的函数fx满足f﹣x＝fx且函数fx在﹣∞0上是减函数若a＝f﹣1b＝flog2c＝f20.3则abc的大小关系为
已知A＝{x|＞0}B＝{x|x2﹣4x+4﹣m2≤0m＞0}． 1若m＝3求A∩B 2若A∪B＝B求实数m取值范围．
如图所示样本A和B分别取自两个不同的总体它们的样本平均数分别为样本标准差分别为SASB则
如图所示函数y＝2cosωx+θx∈Rω＞00≤θ≤的图象与y轴交于点0且该函数的最小正周期是π． 1求θ和ω的值． 2已知点A0点P是该函数图象上一点点Qx0y0是PA的中点当y0＝x0∈[π]时求x0的值．
在空间直角坐标系中点P﹣123关于平面yOz对称的点的坐标为
下列函数中最小正周期为π的是
执行如图所示的程序框图若输入k＝3则输出S＝
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甲乙丙三人随机排成一排乙站在中间的概率是
10分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短文.短文中共有10处错误每句中最多有两处.错误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∧并在此符号下面写出该加的词. 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10处多者从第11处起不计分. Everyyearmyschoolholdsthesummercamp.I'dlovetakepartinthisactivitysomuchbecauseIcanhavealotoffunswithmyfriends.Lastyearwegotocountryfarmthatweexperiencedadifferentlife.IwassoimpressedbytheclearriveandHueskythere.Theywokeupearlyinthemorningandthenwalkedinthecountryroadtogether.Thecountrysideweresoquietandtheairwassofresh.Ifeltrealpeacefulinmymind.BecauselifetherewassimplesoIlikeditverymuch.Iwassoclosetothenatureandcouldappreciateitsbeauty.
10分ThereisanoldSpanishProverbwhichstatesTomorrowisoftenthebusiestdayoftheweek.1I'dsaytoomany.Ourdreamsshouldnotandcannotwait.Wehavetogoforthemnow!Here'swhy. 1.2 Nobodylikestotalkaboutdeathbuttherealityis﹣everybodyisgoingtodieatonepoint.Noneofusknowthedayorthehour.Thereforetodayisallwehave.Don'tgotoyourgravewithunfulfilleddreams.Makethedecisiontogoaftereverydreambigorsmallrightnow. 2.Theworldiswaitingonyourgift IknowthismaybehardtobelievebuttheworldiswaitingonYOU!YesYOU!3Sureotherpeoplemaybeabletosing.Butthey'llneverbeabletosingexactlylikeyou.Sureotherpeoplecanwritebutthey'llneverbeabletowritefromthesameperspectiveinwhichyouwrite.Don'tdeprivetheworldofyourgift. It'stheoxygenthatweneedtosurvive.Thusitisyourresponsibilitytofigureoutexactlywhatyourgiftisandusetobetteryourlifeandthelivesofthosearoundyou. 3.4 YoucandreamaboutwritingthegreatAmericanplaythatyouwantbutit'snevergoingtohappenunlessyouactuallyputpentopaper.Youcandreamaboutfindingacureforcancerbutitwillneverhappenunlessyouactuallygotoschooltobecomeequippedwiththenecessarytoolstofindthatcure.5Theyrequireyoutogetyourheadoutofthecloudsandactuallydotheworktomakethemhappen.Gettoit! A.Youcan'tletfearwin. B.Tomorrowisnotpromised. C.Inotherwordsdreamsdon'tworkunlessyoudo. D.Possibilitiesyouneverknewexistedarewaitingonyou E.Howmanytimeshaveweputoffourdreamsuntiltomorrow? F.Unlessyoutakethefirststepyourdreamswillnevercometrue. G.Youwerebornintotheworldwithauniquegiftwhichnobodyonthisearthcancopy.
已知函数若实数m∈01则函数gx＝fx﹣m的零点个数为
已知扇形的圆心角为rad半径为6cm则扇形的弧长为cm．
已知函数． Ⅰ若函数fx是R上的奇函数求a的值 Ⅱ若函数fx的定义域是一切实数求a的取值范围 Ⅲ若函数fx在区间[01]上的最大值与最小值的差不小于2求实数a的取值范围．
设D为△ABC所在平面内一点则
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