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如图所示，圆心为O的四分之一圆弧区域内存在方向垂直纸面向里的匀强磁场，Q点为OA半径的中点．现有比荷相同的甲、乙两个带电粒子分别从O点、Q点同时垂直磁场方向和OA进人磁场，结果甲粒子从A点射出磁场，...
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高三下学期物理《》真题及答案
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半径为5厘米的三个圆弧围成如右图所示的区域其中AB弧与AD弧四分之一圆弧而BCD弧是一个半圆弧则此
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若点的运动方程为则它的运动轨迹是
半圆弧
圆周
四分之一圆弧
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半径为5厘米的三个圆弧围成如右图所示的区域其中AB弧与AD弧四分之一圆弧而BCD弧是一个半圆弧则此
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如图所示空间存在四分之一圆形磁场区域磁场方向垂直纸面向外．一电子以初速度v从圆心O沿着OD方向射入磁
如图所示半径为R.的一圆柱形匀强磁场区域的横截面纸面磁感应强度大小为B.方向垂直于纸面向外一电荷量为
半径为5厘米的三个圆弧围成如右图所示的区域其中AB弧与AD弧是四分之一圆弧而BCD弧是一个半圆弧则
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有一种质谱仪的工作原理图如图所示静电分析器是四分之一圆弧的管腔内有沿圆弧半径方向指向圆心O1的电场且
半径为5厘米的三个圆弧围成如右图所示的区域其中AB弧与AD弧是四分之一圆弧而BCD弧是一个半圆弧则此
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半径为5厘米的三个圆弧围成如右图所示的区域其中AB弧与AD弧四分之一圆弧而BCD弧是一个半圆弧则此区
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6.00分如图所示虚线所示的圆形区域内存在垂直纸面向里的匀强磁场P为磁场边界上的一点．大量质量为m电
如图所示为某种透明介质的截面图△AOC为等腰直角三角形BC为半径R=12cm的四分之一圆弧AB与水平
半径为5厘米的三个圆弧围成如下图所示的区域其中AB弧与AD弧是四分之一圆弧而BCD弧是一个半圆弧则
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半径为5厘米的三个圆弧围成如右图所示的区域其中AB弧与AD弧为四分之一圆弧而BCD弧是一个半圆弧则此
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2017年·银川二模如图甲所示一四分之一光滑圆弧轨道最低点与平台右端B相接并与平台相切圆弧的半径R＝
半径为5厘米的三个圆弧围城如图所示的区域其中弧AB与弧AD为四分之一圆弧而弧BCD是一个半圆弧则此
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半径为5厘米的三个圆弧围成如右图所示的区域其中AB弧与AD弧是四分之一圆弧而BCD弧是一个半圆弧则
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如图所示为某种透明介质的截面图△AOC为等腰直角三角形BC为半径R=12cm的四分之一圆弧AB与水平
半径为5厘米的三个圆弧围成如图所示的区域其中AB弧与4D弧是四分之一圆弧而BCD弧是一个半圆弧则此
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以边线和球门线交叉点为圆心向场内各画一段四分之一的圆弧这个弧内地区叫角球区这个圆弧的半径是多少米
半径为5厘米的三个圆弧围成如右图所示的区域其中AB弧与AD弧四分之一圆弧而BCD弧是一个半圆弧则此区
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九连环是我国古老的一种智力游戏它环环相扣趣味无穷九连环由九个大小相同的圆环依次排开镶在铁丝框架上．玩九连环就是将九连环按照一定规则从框架上解下或套上．用Kn表示解下n个圆环所需移动的最少次数已知K1＝1K2＝2通过规则可知Kn＝Kn﹣2+2n﹣11≤n≤9n∈N则K5＝．
已知向量⊥||＝1则|+|＝
Peoplebecomeaddictedtomanythings.Someofthesemaybedrugsalcoholandsmokingbutalsoelectronics.Electronicsgetyouaddictednotbecauseofdrugslikenicotinebutbecauseofsomethingcalleddopamine多巴胺. Dopamineisachemicalnaturallyproducedinthebodythathelpscontrolthebrain'srewardandpleasurecenters.Itisreleasedwhenyouwinsomething.Younotonlygetdopaminefromwinningsportslikefootballortennisbutalsogetasmallamountofdopaminewhenyouhearanotificationfromyourdevicewinsomethinginavideogameorevensimplysurfthewebonyoursmartphone.Yourbodylovesthefeelofdopamineandtriestofindmorewaystogetitwithlesseffortwhichcanleadtoaddictiontoelectronics. Webecomeaddictedtovariouselectronics.Butamongallofthemphonesmaynotdotoomuchharmtousphysically.It'sdevicessuchastelevisionsandcomputersthatcauseyoutositfortoolongwithoutstretchingormovingwhichcanresultinaconditionknownasdeepveinthrombosis深静脉血栓.Itcancauseseriousdamagetoourhealth. Howeverwecantrytobreakawayfromaddiction.Wecanmakeaccesstoourdevicesalittlemoredifficultwhichcandiminishthechancesofusactuallywantingtogoanddothatspecificthing.Forexampleifyouknowyoufrequentlyuseanapponyoursmartphoneyoucanputtheappincertainfarcornerofyourphonethereforeitwouldtakeyoualittleextratimetogettoitinsteadofjustturningthephoneonandhavingdirectaccesstoit.Besideswecanpreventphysicalproblemsbyusingastandingdesk.Thisisbasicallyadeskbutyouhavetostandatitinsteadofsittingonit.Thiscanpreventawiderangeofphysicalproblemsincludingobesitylowerriskofheartdiseaseandsoon. Allinallelectronicsprobablyalreadyhaveyouaddicted.Thankfullytherearewaysyoucangetoutofthisaddiction.It'snotalostcauseandyoucanstillgetyourselfhealthyandoutofaddiction. 1Whenweplaywithelectronicsthedopamineproducedinthebody. A.isbadforourmentalhealth B.causesaddictiontoelectronics C.increasesthechanceofwinning D.isinchargeofourbrain'sactivities 2WecaninferfromParagraph3thatphones. A.areharmlesstoourphysicalhealth B.dogreatharmtoourmentalhealth C.arenomoreaddictivethanotherdevices D.don'tharmourbodyasmuchasotherdevices 3WhatdoestheunderlinedworddiminishinParagraph4mean? A.Reduce. B.Ruin. C.Access. D.Seize. 4WhatdoestheauthorintendtodoinParagraph4? A.Advertiseanewstandingdesk. B.Callonpeoplenottouseelectronics. C.Advisepeopletousetheirappswisely. D.Providewaysofgettingridofaddictiontoelectronics.
在△ABC中sinAsinBsinC成等差数列sinC﹣+sinC+＝sin2C且＝32则|AB|＝
Awomanprofessorwalkedaroundinaclassroomwhileshewasteachingstressmanagementtoherstudents.1sheraisedaglassofwater2expectedtheywouldbeaskedthehalf﹣emptyorhalf﹣fullquestion. Insteadwitha3onherfacesheaskedWhat'sthe4ofthisglassofwater? 5calledoutrangedfromeighttotwentyounces盎司. She6thestudentsdownandthenrepliedTheabsoluteweightdoesn'tmatter.Itall7howlongIholdit.IfIholditforaminuteit'snotaproblem.IfIholditforanhourI'llhavea8inmyarm.IfIholditforadaymyarmwillfeelnumb麻木andparalyzed麻痹.Ineach9theweightoftheglassofwaterdoesn'tchangebutthelongerIholditthe10itbecomes.Doyouknowwhy? Allthestudentskeptsilentandlistenedcarefullylostinthought. She11Ourand12inlifearelikethatglassofwater.Thinkaboutthemforawhileandnothing13.Thinkaboutthemabitlongerandtheybegintohurt.Andifyouthinkaboutthemalldaylongyouwillfeel14unabletodoanything. It'simportantto15toletgoofyourstresses.Asearlyintheeveningaspossibleputallyourburdensdown.Don't16themthroughtheeveningandintothenightRemembertoputtheglassdown! Moreoftenthannotlifegets17whenwethinktoomuch.Andthemomentyou18yourburdenyou'llfindyourselffeelingsomuchmorerelaxed. So19wonderingaroundandfeelingsorryforyourselfstartdoingsomethingaboutit.Afteralllifeistooshorttodevoteyourselftoanythingthatmakesyou20. 1A.If B.As C.However D.Though 2A.everyone B.nobody C.someone D.anyone 3A.look B.puzzlement C.smile D.surprise 4A.quality B.weight C.amount D.problem 5A.solutions B.numbers C.methods D.answers 6A.quieted B.stopped C.signed D.signaled 7A.decidedon B.dependson C.resultedfrom D.resultedin 8A.cut B.problem C.danger D.pain 9A.glass B.way C.case D.manner 10A.moreserious B.more C.harder D.heavier 11A.continued B.explained C.commented D.replied 12A.worries B.anger C.discomfort D.problem 13A.matters B.helps C.happens D.works 14A.shocked B.dissatisfied C.angry D.discouraged 15A.come B.remember C.realize D.believe 16A.get B.carry C.put D.take 17A.exciting B.frightening C.terrible D.colorful 18A.undertake B.refuse C.remove D.change 19A.ratherthan B.morethan C.besides D.Asto 20A.relaxed B.unsure C.excited D.unhappy
Becominganeffectiveandefficientstudentisnotsomethingthathappensovernightbutputtingafewofthesetipsintodailypracticecanhelpyougetmoreoutofyourstudytime. Focusonlearninginmorethanoneway.Insteadofjustlisteningtoapodcastwhichinvolvesauditory听觉的learningfindawaytorepeattheinformationbothverbally口头地andvisually.Youcandescribewhatyoulearnedtoyourfriend.1. Teachwhatyou'velearnedtoanotherperson.Startbytranslatingtheinformationintoyourownwords.2.Someideasincludewritingablogpostcreatingapodcastorparticipatinginagroupdiscussion. Gainpracticalexperience.Ifyouaretryingtoacquireanewskillorabilityfocusongainingpracticalexperience.3.Ifyouarelearninganewlanguagepracticespeakingwithanotherpersonandsurroundyourselfwithlanguage﹣immersionexperiences. 4.Weknowlearningisn'taperfectprocess.Sometimesweforgetthedetailsofthingsthatwehavealreadylearned.Ifyoufindyourselfstrugglingtorecallsomeinformationresearchshowsthatyou'dbettersimplylookupthecorrectanswerbecausethatrecallingmayresultinlearningtheerrorstateinsteadofthecorrectresponse. Understandhowyoulearnbest.Anothergreatstrategyforimprovingyourlearningefficiencyistorecognizeyourlearninghabitsandstyles.5.Thenyourlearningefficiencycanbeimprovedgreatly. A.Recallingresultsinthewronganswer. B.Lookupanswersratherthanstruggletoremember C.Nextfindsomewaystosharewhatyou'velearned. D.Youcanapplyitbysharingyournewlylearnedskills. E.Ifitisasportofathleticskillperformtheactivityregularly. F.Thathelpsyougainabetterunderstandingofhowyoulearnbest. G.Intheprocessyoucanmaketheknowledgemorepermanentinyourmind.
过抛物线Cy2＝4x的焦点F作互相垂直的弦ABCD则四边形ACBD面积的最小值为．
假定你是李华你看到悦读网Enjoyreading正在举行百日阅读汉语经典活动要求参加者在网上连续阅读一百天每天至少半小时完成后该网站免费赠送书籍.请给你的留学生朋友Henry写封邮件推荐该活动.内容包括 1.介绍该活动 2.推荐该活动 3.推荐理由至少两条. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
如图等腰梯形ABCD中AB∥CDAC与BD交于点O∠DAB＝45°若AB＝3CD＝6则以下所有结论中正确的序号是． ①若＝则μ＝3λ ②三角形AOB的面积为4 ③＝＝ ④若MN是直线BC上的动点•＝24
某单位有7个连在一起的车位现有3辆不同型号的车需停放如果要求剩余的4个车位中恰好有3个连在一起则不同的停放方法的种数为
已知Sn是数列{an}前n项和点anSn+2n+1n∈N*在直线2x﹣y＝0上令bn＝cn＝1． 1求a1的值 2求证数列{bn}是等差数列 3对任意的pq∈N*若λ≥|cp﹣cq|恒成立求实数λ的取值范围．
Drinkingwaterisoneofthefavorsyoucandotoyourbody.Ithassurprisinghealthbenefitssuchasmakingyou1energyandhappy.Thereisalonglistof2reasonwhywatershouldbeamustinyourdiet. Ifyouarelookingforaproductthathelpsyourecoverandbecomeyoungerwaterisagood3choose.Itcanhelpyourskinrecoverfasterafterbeinginjured.Hotwaterevenhelpsyourskinbecomesmooth. Wateris4keepsthefoodmovingdownthroughyourbody.Ifthereisnotenoughwaterinthebodyit'llbetoohardforthefood5passthroughthebody.Warmwaterhelpsbreakdownfoodfasterandcan6effectiverelieveyourskin.Accordingtoastudydrinkingtwocupsofwaterwillincrease7speedofdigesting8about30%.Thisincludeswarmwaterwhichincreasesyourbodytemperaturesothefoodcan9digestfaster. Hotwatercanalsoplayarolein10cleanyourskinsoinawayitisanaturalskincareproduct.Fewerharmfulbacteriaintheskinmeanasmallerriskofsufferingskindiseases.
已知函数fx＝xlnx﹣2ax2+xa∈R． Ⅰ若fx在0+∞内单调递减求实数a的取值范围 Ⅱ若函数fx有两个极值点分别为x1x2证明x1+x2＞．
Lookingforsomeplacesoutofthisworldtovisitonvacation?Herearefourcoolplacestovisit. KennedySpaceCenterVisitorComplex LocatedintheeastofOrlandoFloridait'sconsideredasthegreatestspaceadventureonEarth.Youcanmeetastronautseatspacefoodwatchmoviesaboutpastspacemissionsandifyou'reluckygettowatchanewlaunchdependingonthespaceprogram'sschedule.Remembertotakeenoughmoneyforadmissionandvarioussouvenirsintheworld'slargeststoredevotedtospacesouvenirsandNASAclothingandequipmentwhichmightcostafortune. AmericanMuseumofNaturalHistory It'sanimportantscientificandculturalinstitutionwithextremelyimpressiveexhibitionsandcollectionsabouthumanculturesthenaturalworldandtheuniverse.Themuseumlookslikeahugeglassboxwithahugeglobeenclosedwhichisquiteattractivetopeople.ItcontainsspaceandastronomyexhibitsamodelsolarsystemandthebeautifulHaydenPlanetarium天文馆. NewMexicoMuseumofSpaceHistory NobodywouldexpectsuchacoolspacemuseuminthedesertnearWhiteSandsNewMexicobutinfactthereisone!Thismuseumrecordsthearea'sspacehistory.Admissionticketsareavailableonthewebsiteanditoffersdiscountsforseniorcitizensandyoungstersunderage12. LowellObservatory TheLowellObservatorylocatedonMarsHilloverlookingFlagstaffwasbuiltinthelate1800sbyMassachusettsastronomyenthusiastPercivalLowelltohelphimstudyMars.VisitorstoLowellObservatorycanseethedomevisitClydeTombaugh'stombtaketoursandparticipateinastronomycamps.Theobservatoryisatanaltitudeofabout7200feetsobringsunscreendrinklotsofwaterandtakefrequentbreaks. 1WhatwillyouprobablyfaceinKennedySpaceCenterVisitorComplex? A.Riskysurrounding. B.Adventurousastronomycamps. C.Terriblespacefood. D.Relativelyhighconsumption. 2WhatisspecialaboutNewMexicoMuseumofSpaceHistory? A.Itssize. B.Itshistory. C.Itslocation. D.Itsbudget. 3Wherearevisitorsadvisedtohavemorerest? A.InKennedySpaceCenterVisitorComplex. B.InAmericanMuseumofNaturalHistory. C.InNewMexicoMuseumofSpaceHistory. D.InLowellObservatory.
Foodisnecessaryforofferingenergytoourbodiesbutsometimeswebuytoomuchofitatthestore.Whenyourfoodstartstogobadtherearemanyotherwaysyoucanstillmakeuseofitinsteadofthrowingitaway. Beforethrowingawayoldbananasyoucanusethepeels皮toshineupmetalsandleathers.Pressthepeelagainstthesurfacemoveitbackwardsandforwardsandthenpolishcleanitwithanoldcloth.Bananameatisalsogoodforreducingwrinkles.Putabitonthosetroublespotsletitsitforawhileandthenwashitoffandyourwrinkleswillgoaway.Lemonsaregreatforlighteningskinandhair.Ifyouhavetroublewithsomeskindiseaseslikeredspotsonyourfaceputabitoffreshlemonjuiceonthemandleaveitovernight.You'llnoticeadifferenceinthemorning.Appleswillhelpripen使成熟tomatoesquicklywhentheyareplacedtogetherinapaperbagandorangepeelsaregreatfirestartersforyournextbackyardcampfireparty. Ifyourdogorcatbringshomefleasusingsaltisagreatwaytogetridofthemaroundthehouse.Justpoursaltintothevacuumcleaner真空吸尘器.Letitsitthenvacuumupthefleas.Thesaltcankillthefleas.Besuretothrowawaythevacuumbagoremptythevacuumbinimmediatelyorsomeofthefleascanclimbout. Beerisagreathairlightener.Ifyouareoutoflemonstrydippingyourhairinbeerbeforegoingoutside.Justdon'tforgettowashitoutafterwards.Milkisgreatforremovingdirtymarksespeciallyifitissometypeofink. Asyoucanseetherearemanyotherusesforeverydayfoodsaroundthehouse.Sonexttimebeforethrowingfoodawaythinkingitisofnousestopforamomentandthinkaboutalltheirusestalkedabouthere. 1Howmanywayswemakeusefruitaretalkedaboutinthepassage? A.3 B.4 C.5 D.6 2WhichoftheAllowingcanbeusedtolightenyourhair? A.Lemonsandbeer. B.Bananasandlemon. C.Orangesandbeer D.Milkandlemon. 3WhatdoestheunderlinedwordtheyinParagraphsreferto? A.Apples B.Tomatoes C.Applestomatoesandapaperbag D.Applesandtomatoes. 4What'sthewriterattitudetosurprisinguseofeverydayfood? A.Negative B.Positive C.Concerned D.Careful
已知△ABC中a＝1b＝2则角B等于
已知实数xyz则下列命题正确的是
已知定义在R上的函数gx其导函数为g'x若gx＝g﹣x+x3+x且当x≥0时g'x＜则不等式2gx﹣2gx﹣1＞3x2﹣3x+2的解集为
ABC是平面内的三点已知A﹣21B23AC的中点M在y轴上BC的中点N在x轴上． 1求点C的坐标 2求过点M且垂直MN的直线l的方程一般式方程．
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10处多者从第11处起不计分. Ihavereceivedandreadyourletterinwhichyoumentionthatyouwantedtoloseweightbydiet. Itisonlynaturallythatyounggirlsatyouragehopetolookbeautiful.Howeverinmyopinionhealthyismoreimportantthanbeauty.Forastudentstudyingisthefirstthingtoconsiderwhileappearanceissecond.Sodonotletothers'opinionstoaffectyournormallife.Thereforeifyoudowanttoloseweightitisagoodideatodoitbygettingmoreexerciseandchangingunhealthyeatinghabits.Themostimportantthingishowyoukeepahealthystateofmindasitwillhelpwithourstudiesandwillalsohelpyouovercomedifficultiesindieting. IhopemyadviceswillbehelpfultoyouandI'mlookingforwardtoyournextletter.
若a＜b＜c则下列结论中正确的是
已知直线4x+m2y﹣m＝0m＞0若此直线在x轴y轴的截距的和取得最小时则直线的方程为
已知为单位向量与的夹角为则与﹣的夹角为
直线l1y＝x+1中若l1l2关于x轴对称则l2的倾斜角
已知△ABC中三内角ABC的度数成等差数列边abc依次成等比数列．则△ABC是
近年来国资委党委高度重视扶贫开发工作坚决贯彻落实中央扶贫工作重大决策部署在各个贫困县全力推进定点扶贫各项工作取得了积极成效某贫困县为了响应国家精准扶贫的号召特地承包了一块土地已知土地的使用面积以及相应的管理时间的关系如表所示 并调查了某村300名村民参与管理的意愿得到的部分数据如下表所示 1求出相关系数r的大小并判断管理时间y与土地使用面积x是否线性相关 2是否有99.9%的把握认为村民的性别与参与管理的意愿具有相关性 3若以该村的村民的性别与参与管理意愿的情况估计贫困县的情况则从该贫困县中任取3人记取到不愿意参与管理的男性村民的人数为x求x的分布列及数学期望． 参考公式 其中n＝a+b+c+d ．临界值表 参考数据≈25.2
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