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假定英语课上老师要求同桌交换修改作文,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...
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高三下学期英语《》真题及答案
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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处错误每句中最多有两处
假定在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
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
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
假定英语课上老师要求同桌之间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
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
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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
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
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
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
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
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AGameofLightandShade Itwasasunnyday.Ihadgoneupanddownthetowerwhenoutsidethedooratthefootablindmancametowardme.Inamomenthedisappearedupthestairs.IlookedatthesignthatsaidTotheToweranddecidedto1him. Icaughtupwithhimintheticketoffice.ThereIwas2toseetheattendant工作人员sellinghimaticketasifhewereanyothervisitor.Thenwiththeticketinonehandand3thewallwiththefingersoftheothertheblindmanreachedthestairs4tothehallway. Thatmanisblind.Whatwouldablindmanclimbupthetowerfor?Isaidtotheattendantexpectinghimtoshowsome5buthedidn'tanswer. Notthe6certainlyIsaid.Perhapshewantsto7. Iboughtaticketand8upthestairs.Themanhadn'tgoneasfarasI9.AthirdofthewayupthetowerIheardhis10.Isloweddownandfollowedhimatalittle11.Hestoppedfromtimetotime.Whenhegottothebalcony阳台Iwasadozensteps12.AsIreacheditIsawhimatthecornerofthetower. AtlastaftertenminutesI13him.ExcusemeIsaidaspolitelyasIcouldbutIamcurioustoknow14youcameup. Hesmiled.Comingupthestairsyouwillnoticehownotjustlightbutsun15intothetowerthroughthenarrowwindowshereandtheresothatyoucanfeelthe16﹣thecoolstairssuddenlybecomequitewarm﹣andhowupherebehindthewallthereis17butassoonasgoingoppositeawindowyoucanfindthesun.Thereisno18sogoodasthisforfeelingthedifferencebetweenlightandshade.ItisnotthefirsttimeI'vecomeup. Theblindmanseemedquite19justlikeachildwhowasenjoyinghisfavoritegames.Hetoldmethetruththatblindmencanalsofindthebeautyinlife20theycannotenjoythesightsoftheworld. 1A.accept B.follow C.control D.visit 2A.frightened B.disappointed C.surprised D.embarrassed 3A.touching B.climbing C.hitting D.covering 4A.pointing B.attaching C.contributing D.leading 5A.respect B.doubt C.concern D.sympathy 6A.view B.test C.prize D.trick 7A.kick B.jump C.relax D.escape 8A.struggled B.explored C.wandered D.hurried 9A.promised B.examined C.imagined D.confirmed 10A.steps B.words C.secrets D.cheers 11A.standard B.distance C.expense D.intention 12A.ahead B.around C.outside D.behind 13A.recognized B.surrounded C.approached D.witnessed 14A.why B.how C.when D.whether 15A.knocks B.pours C.slides D.bursts 16A.trend B.reaction C.change D.honor 17A.light B.space C.mess D.shade 18A.place B.signal C.object D.period 19A.nervous B.content C.curious D.patient 20A.unless B.because C.once D.although
用双缝干涉测光的波长的实验装置如图所示其中光源为白炽灯泡调整实验装置使光屏上能观察到清晰的干涉条纹．关于该实验下列说法正确的是
正六边形ABCDEF区域内有平行于纸面方向的匀强电场图中未标出ABC三点电势分别为3V6V9V现有一个电子从E点以初速度v0沿EB方向射入．下列说法正确的是
如图所示竖直线MN∥PQMN与PQ间距离为a其间存在垂直纸面向里的匀强磁场磁感应强度为BO是MN上一点O处有一粒子源某时刻放出大量速率均为v方向均垂直磁场方向比荷一定的带负电粒子粒子重力及粒子间的相互作用力不计已知沿图中与MN成θ＝60°角射出的粒子恰好垂直PQ射出磁场则粒子在磁场中运动的最长时间为
如图所示小物块以初速度v0从O点沿斜面向上运动同时从O点斜向上抛出一个速度大小也为v0的小球物块和小球在斜面上的P点相遇．已知物块和小球质量相等空气阻力忽略不计则
下列各种关于近代物理学的现象中与原子核内部变化有关的是
图甲所示的变压器原副线圈匝数比为31图乙是K闭合时该变压器cd输入端交变电压的图象L1L2L3L4为四只规格均为“12V6W”的相同灯泡各电表均为理想交流电表．以下说法正确的是
如图已知气垫导轨上滑块的质量为M钩码的质量为m遮光条宽度为d两光电门间的距离为L气源开通后滑块在牵引力的作用下运动遮光条先后通过两个光电门的挡光时间为△t1和△t2取当地重力加速度为g． 1用上述装置探究滑块加速度a与其质量M及绳子拉力F用钩码重力代替的关系下列做法正确的是． A．应控制钩码的质量m远小于滑块的质量M B．可更换更宽的遮光条以减小实验误差 C．应调节滑轮高度使连接滑块的细线与轨道平行 D．还应测出滑块从光电门1到光电门2的时间△t 2还可用上述装置探究系统在运动中的机械能关系滑块从光电门1运动到光电门2的过程中满足关系式时用题干中的已知量表示“钩码﹣滑块”系统机械能守恒．
如图两条间距L＝0.5m且足够长的平行光滑金属直导轨与水平地面成α＝30°角固定放置磁感应强度B＝0.4T的匀强磁场方向垂直导轨所在的斜面向上质量mab＝0.1kgmcd＝0.2kg的金属棒abcd垂直导轨放在导轨上两金属棒的总电阻r＝0.2Ω导轨电阻不计．ab在沿导轨所在斜面向上的外力F作用下沿该斜面以v＝2m/s的恒定速度向上运动．某时刻释放cdcd向下运动经过一段时间其速度达到最大．已知重力加速度g＝10m/s2求在cd速度最大时 1abcd回路的电流强度I以及F的大小 2abcd回路磁通量的变化率以及cd的速率．
有同学利用如图1所示的电路测定电源的电动势和内阻提供的器材有 A．干电池两节每节电动势约为1.5V内阻未知 B．直流电压表V1V2内阻很大 C．直流电流表A内阻可忽略不计 D．定值电阻R0阻值未知但不小于5 E．滑动变阻器 F．导线和开关 1请根据所给电路图以笔画线代表导线在图2的实物图上将所缺导线画上． 2甲同学利用该电路完成实验时由于某根导线发生断路故障导致一只电压表始终没有读数因此只记录了一只电压表和电流表的示数如表所示 利用表格中的数据在图3中作出U﹣I图． 3由图象可知两节干电池总电动势为V总内阻为．由计算得到的数据可以判断能够示数的电压表应为表选填“V1”或“V2”．
如图所示质量为mB＝3kg的薄木板B放在水平面上质量为mA＝2kg的物体A可视为质点在一电动机拉动下从木板左端以v0＝6m/s的速度向右匀速运动．在物体A带动下木板从静止开始做匀加速直线运动此时电动机输出机械功率P＝96W．已知木板与地面间的动摩擦因数μ＝0.2重力加速度g取10m/s2．求 1木板B运动的加速度大小 2木板B的长度满足什么条件物体A最终能滑离木板B．
假设你是红星中学高三的学生李华.你班交换生Jim将要参加学在中国留学生汉语演讲比赛来信向你咨询.请你给他写一封邮件内容包括 1.推荐一个演讲话题 2.说明推荐的理由 3.建议他做哪些准备工作. 注意1.词数不少于50 2.邮件的开头和结尾已给出不计入总词数. DearJim Yours LiHua
FlyingHigh BarringtonIrvingmadehishistoricflightandfoundedaneducationalnon﹣profit﹣makingorganization.HismessageforkidsTheonlythingthatseparatesyoufromscientistsisdeterminationhardworkandastronglikingforwhatyouwanttoachieve.Thesecrethebelievesishavingadreaminthefirstplaceandthatstartswithlearningexperiencesthatinspirekidstobuildcareers. ThemomentofinspirationforIrvingcameattheageof15inhisparents'bookstore.OnecustomeraprofessionalpilotaskedIrvingifhe'dthoughtaboutbecomingapilot.ItoldhimIdidn'tthinkIwassmartenoughbutthenextdayhetookmetothecockpit驾驶舱ofthecommercialairplaneheflewandjustlikethatIwashooked. TofollowhisdreamIrvingturneddownafootballscholarshiptotheUniversityofFlorida.Hewashedairplanestoearnmoneyforaflightschoolandincreasedhisflyingskillsbypractisingathomeona﹩40flightsimulator模拟videogame.Thenanotherdreamtookholdflyingalonearoundtheworld.Hefacedmorethan50rejectionsforsponsorshipbeforeconvincingsomecompaniestodonateaircraftcomponents.Hetookoffwithnoweatherradarnode﹣icingsystemandjust$30inhispocket.IliketodothingspeoplesayIcan'tdo. After97days26stopsanddozensofthunderstormshetoucheddowntoacheeringcrowdinMiami.Itwasseeingsomanyyoungpeoplewatchingandlisteningthatpushedmeintogivingbackwithmyknowledgeandexperience.Irvinghasbeendoingiteversince.Hesetuphisnon﹣profit﹣makingorganizationExperienceAviation航空aimingtoincreasethenumbersofyouthinaviationandscience﹣relatedcareers.Kidsattendprogrammesdealingwithhands﹣onroboticsprojectsandflightsimulatorchallenges. Wewanttocreatechancesforstudentstoaccomplishsomethingamazinghenotes.PerhapsIrving'smostpowerfuleducationaltoolistheexamplehisownlifeprovides.Afterlandinghisrecord﹣breakingflightatage23hesaidEveryonetoldmeIwastooyoungthatIdidn'thaveenoughexperiencestrengthorknowledge.TheytoldmeitwouldtakeforeverandI'dnevercomehome.Well…guesswhat? 1AccordingtoIrvingwhatisthemostimportantinachievingsuccess? A.Meetingpeoplewhoprovideunexpectedhelp. B.Gettingachancetostudytechnicalknowledge. C.Havingsomethingspecificthatyouwanttoaccomplish. D.Developingcommunicationwithdifferentorganizations. 2WhatIrvingrepliedtothepilotinthebookstoresuggestedthat. A.hefeltembarrassedtorefusetheoffer B.hewasdoubtfulabouthisownabilities C.heknewhiseffortswouldberewarded D.herealizedimmediatelyhowluckyhewas 3WhatcanwelearnaboutIrvinginParagraph3? A.Hechosetoreducehisbudgetaslowaspossible. B.Hewasfinallygivenenoughmoneytokeepgoing. C.Hegotthemostusefulflyingtipsfromhisvideogame. D.Hetookonafurtherchallengeafterheknewhowtofly. 4Irvingsetuphisnon﹣profit﹣makingorganizationbecause. A.hehopedtobecomeapublicfigure B.heexpectedtostartabusinessinotherfields C.hesawtherewasgreatinterestinwhathewasdoing D.hethoughthecouldteachmorethanflightschoolscould
下列说法中正确的是
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给校刊英语园地写一篇短文介绍上周你与外国朋友Tom在颐和园的经历. 注意词数不少于60. 提示词毛笔awritingbrush
已知复数z＝﹣则z的共轭复数的虚部为
如图所示内壁光滑半径R＝1.25m的四分之一圆弧轨道AB在最低点B与粗 糙水平轨道BC相切质量m1＝0.1kg的物块a自圆弧轨道顶端由静止释放质量m2＝0.2kg的物块b静止在水平轨道上与B点相距x＝4m一段时间后物块ab发生弹性正碰．已知ab与水平轨道间的动摩擦因数均为μ＝0.2忽略空气阻力重力加速度g取10m/s2． 1物块ab碰撞前a的速度大小 2物块ab碰撞后相距的最远距离．
Anythingyouwantanytimeyouneedit. ThemessageappearedoncomputerscreensacrossthecountryatthesametimeonthesamedayDecember12that12p.m..Simultaneouslyimportantlookingenvelopescontainingcardswiththesamemessagewerehand﹣deliveredtotheofficesofallthemajornewscompanies. OnefounditswaytothedeskofChrisLinabusinessreporteratThePost.Thecardwasbeautifullydesigned﹣ablackbackgroundwiththewordsprintedoutincrispwhiteletters.Therewasnoexplanationonthebackjustawebsiteaddress.Chriswenttothewebsite.Itsstylewasidenticaltothecard'sandsaidAnytimeStartingTomorrow. ThenextdaywebsitesandblogswerefilledwitharticlestheorisingaboutAnytime.WasitashoppingwebsitelikeTaoBaoorAmazon?Ajoke?Somethingillegal?Anytime'smarketinghadworked﹣itwasahouseholdnamebeforeit'devenmadeasinglesale. WhentheopeningcamethatdayatnoontheAnytimewebsitesuddenlyhadasinglefieldthatreadWhatdoyouwant?Allyouhadtodowastypethewordsintothatboxandthenspecifyhowquicklyyouwantedyouritemdeliveredwithinonetenortwenty﹣fourhours. Bloggerswerethefirsttotesttheservice.Andtheirreviewswereglowing.WithinweeksAnytimehadbecomeapartofdailylife.NobodyusedotherdeliverysitesorthepostanymoreasAnytimewasmuchcheaperandfaster. ChrisstillwonderedwhatexactlyAnytimewas.Hetriedtofindoutwhoownedthecompanybutitwasregisteredinasmallcountrythatdidnotrequiresuchinformationtobemadepublic.Hedidfindsomeinterestingfactsthough.Anyonewhochallengedthecompanyitseemedmetwithserioustrouble.AgovernmentofficialcriticalofAnytimeforavoidingtaxwasforcedtoleavehispositionafternewsstoriessuddenlyappearedclaiminghewasdishonest.TheheadofanothercompanytakingAnytimetocourtdiedinacaraccidentjustdaysbeforethecasewastobegin. ChrisbeganmakingalistofallthepeoplewhohadsomethingterriblehappentothemafteropposingorcriticisingAnytime.Bylunchhehadmorethanonehundredexamples.Somethingwasdefinitelywrong.Chrisworkedonhislisttherestofthedayemailingpeoplewhocouldprovidemoreinformationandlookingthroughnewspaperrecords.AfterworkingthroughthenightanexhaustedChrisfinallyfellasleepathisdeskat4a.m.. WhenhewokeafewhourslatertherewasamessageflashingonhiscomputerscreenStopmakingtrouble.Chrissmiled.Hehadnointentionofstoppingnowthatheknewhewasontherighttrack. 1WhatwasonthefrontofthecardsenttoChrisLin? A.Aninvitationtoacompanyopening. B.Thewebsiteaddressofanewcompany. C.ThewordsAnytimeStartingtomorrow. D.ThewordsAnythingyouwantanytimeyouneedit. 2Whydidthecompanychoosetosendthecardstomanynewsreporters? A.Becauseitdidn'thaveenoughmoneyfortraditionaladvertising. B.Becauseitwantedtoattractthereportersascustomers. C.Sothereporterswouldwritestoriesaboutthenewcompany. D.Sopeoplewouldfindthenewcompanyinteresting. 3WhatdidChris'sresearchsuggestaboutAnytime? A.Itmaybeverydangerous. B.Itspopularitywouldsoondecrease. C.Itwasdoingbusinessallovertheworld. D.Itwasbeingwidelycriticisedbyjournalists. 4HowdidChrisfeelattheendofthestory? A.Scaredthathewouldgetintotrouble. B.Confidentthathewouldfindthetruth. C.Nervousaboutwhatthecompanywoulddo. D.Satisfiedthathehaddiscoveredthecompany'ssecret.
下列说法正确的是
在光滑水平面上动能为E动量大小为P的小钢球1与静止小钢球2发生碰撞碰撞前后球1的运动方向相反将碰撞后球1的动能和动量大小分别记为E1P1球2的动能和动量大小分别记为E2P2则必有
如图所示电荷量分别为+2q和﹣q的两个点电荷PQ置于真空中在它们的连线上取ABCDE五点已知AB＝BP＝PC＝CQ＝QD＝DE下列判断正确的是
如图所示为某时刻的两列简谐横波在同一介质中沿相同方向传播的波形图此时a波上某质点P的运动方向如图所示则下列说法正确的是
如图所示为一滑草场．某条滑道由上下两段高均为h与水平面倾角分别为45°和37°的滑道组成滑草车与草地之间的动摩擦因数为μ．质量为m的载人滑草车从坡顶由静止开始自由下滑经过上下两段滑道后最后恰好静止于滑道的底端不计滑草车在两段滑道交接处的能量损失sin37°＝0.6cos37°＝0.8．则
如图甲所示理想变压器原副线圈的匝数比为101R1＝10ΩR2＝15ΩC为电容器电流传感器与原线圈串联．当开关S断开时传感器测得的正弦交流电如图乙所示则
某活动小组利用图甲装置验证机械能守恒定律．钢球自由下落过程中先后通过光电门AB计时装置测出钢球通过AB的时间分别为tAtB．用钢球通过光电门的平均速度表示钢球球心通过光电门的瞬时速度．测出两光电门间的距离为h钢球直径为D当地的重力加速度为g． 1用20分度的游标卡尺测量钢球的直径读数如图乙所示钢球直径为D＝cm． 2要验证机械能守恒只要比较． A．D2﹣与gh是否相等B．D2﹣与2gh是否相等 C．D2﹣与gh是否相等D．D2﹣与2gh是否相等 3钢球通过光电门的平均速度选填“＞”或“＜”钢球球心通过光电门的瞬时速度由此产生的误差选填“能”或“不能”通过增加实验次数减小．
矩形滑块由不同材料的上下两层粘合在一起组成将其放在光滑的水平面上质量为m的子弹以速度v水平射向滑块．若射击下层子弹刚好不射出若射击上层则子弹刚好能射穿一半厚度如图所示．则上述两种情况相比较
如图所示质量为m的A球以速度v0在光滑水平面上运动与原静止的质量为4m的B球碰撞碰撞后A球以v＝av0的速率弹回并与挡板P发生完全弹性碰撞若要使A球能追上B球再相撞则a的可能取值为
EarlyorLaterDayCare Manyyoungparentsareconfusedaboutwhethertheirchildrenshouldhaveearlydaycareandtherehavealwaysbeendifferentviewsonthissubject. TheBritishpsychoanalystJohnBowlbybelievesthatseparationfromparentsduringthesensitiveattachmentperiodfrombirthtothreemayscarachild'spersonalityandleadtopsychologicalproblemsinlaterlife.SomepeoplehavedrawntheconclusionfromBowlby'sworkthatchildrenshouldnotbesubjectedtodaycarebeforethreebecauseoftheparentalseparationitcausesandmanypeopledobelievethis. AccordingtoBowlbyagreatdealofpsychologicalharmcanoccurwhenyoungchildrenareseparatedfromtheirparents.Iftheyareleftwithouttouchforawhiletheywillhaveahigherstresslevel.Parents'influenceontheirchildren'swell﹣beingmayneverbegreaterthanduringtheearliestyearsoflifewhenachild'sbrainisdevelopingrapidlyandwhennearlyallofherorhisexperiencesareshapedbyparentsandthefamilyenvironment. Howevertherearecritics.Someanthropologists人类学家pointoutthattheloveaffairbetweenchildrenandparentsfoundinmodernsocietiesdoesnotusuallyexistintraditionalsocieties.Therehasbeenalonghistoryofthefactthatfatherandmotherdidnotbringuptheirchildrenalone.Platoaround394B.C.arguedthatasystemofearlychildcarewouldfreewomentoparticipateinsociety.ResultsfromIsraeliandDutchstudiesshowthatchild﹣raisingdutiesaremoreevenlydistributedamongabroadergroupofpeople. Besidesstudieshavereportedthatearlydaycarehasaneutralorslightlypositiveeffectonchildren'sdevelopment.Theylearnthebenefitsofbeingsociallysmartunderstandingtheconceptofsharingandcaring.Theypromoteconcentrationskillswhichisveryimportantintheirlearning.Therearegameswherechildrenaretaughtbasiclanguageandmathematicalskillsthroughstoriesandeverydayexamples. Commonsensetellsusthatearlydaycarewouldnotbesowidespreadifchildrenhadproblemswithit.ButBowlby'sanalysisraisesthepossibilitythatithasdelayedeffects.Thepossibilitythatsuchcaremightleadtomorementalillness15or20yearslatercanonlybeexploredbytheuseofstatistics.Whateverthelong﹣termeffectsparentssometimesfindtheimmediateeffectsdifficulttodealwith.Childrenunderthreedislikeleavingtheirparentsandshowunhappiness.Attheageofthreealmostallchildrenfinditeasytogotothenursery.Thematterthenisfarfrombeingclearlyknownthoughexperienceandavailableevidenceindicatethatearlydaycareisreasonableforyoungchildren. 1Thepassagemainlyargueswhether. A.childrenoverthreewillacceptschooleducation B.childrenunderthreeshouldbesenttonurseryschools C.thefamilyrelationshipisdifferentintraditionalsocieties D.earlydaycareshouldbetotallyreplacedinmodernsocieties 2WhichofthefollowingsupportsBowlby'stheory? A.Earlydaycarewouldn'tbesopopularifithadnegativeeffects. B.Separationfromparentsforyoungchildreniscommoninhistory. C.Parentsfindtheimmediateeffectsofearlydaycaredifficulttodealwith. D.Studiesshowearlydaycarehasapositiveeffectonchildren'sdevelopment. 3Theauthor'sattitudetowardsearlydaycareisthat. A.childrenunderthreeshouldstaywiththeirparents B.ithaspotentialbenefitsforbothchildrenandparents C.thebadeffectofitonchildrenwilldisappearastheygrowup D.itiscontroversialandthesettlementcallsfortheuseofstatistics 4Whichofthefollowingshowsthedevelopmentofideasinthepassage? A. B. C. D. IIntroductionPPointSpSub﹣point次要点CConclusion
Chuckwasinmyhigh﹣schoolEnglishclass.1SowhenhetoldmehehadbeenacceptedintothejournalismprogramattheUniversityofMissouriIwasn'tsurprised. DuringthefirstyearatcollegeChuckstoppedbyschoolafewtimes.Wetalkedaboutourworktogetherseveralyearsbefore.Wehadraisedmoneytogetherfortwenty﹣threesickandabandonedbabies.2Itwasanactivitythatinsomewayschangedourformalrelationshipintoafriendship. InhissecondyearincollegeitwasdiscoveredthatChuckhadlungcancerandhadonlyashortwhiletolive.Soheleftschoolandcamehometobeneartohislovedones. AboutsixweekslaterChuckdied.3TheyoungestofninechildrenChuckwastalentedandfullofpromise.Moreimportantlyhewasagoodpersonajustman. WhenIwenttohisfuneralhisfatheraskedtospeakwithme.HetoldmethatbeforeChuck'sdeathhechosesixitemstoburywithhim.4 HetoldmethatChuckhadalwayskeptthepiecebecausehelikedthemessageIhadwrittentohimatthebottomofthelastpage.InthatlittlenoteIaffirmed肯定histalentasawriterandIencouragedhimtoberesponsibleforthegift. 5Histakingmynotewithhimforeverofferedmeagreatopportunityforinfluencingstudents'lives.Ifeltinspiredwithasenseofpurposethatwasgreaterthaneverteachershavethepowertoaffectheartsandmindsforalongtime. A.Hewasawriterofgreatpromise. B.Chuckhelpedtoraiseseveralthousanddollars. C.WheneverIforgetmypurposeIthinkofChuck. D.Itwasagreatlossforeveryoneespeciallyforhisfamily. E.MyspiritswereliftedupasChuckwasfilledwiththejoyoflife. F.Oneofthemwasanessayhehadwritteninmyclasssomeyearsbefore. G.IwastouchedandgratefultoChuckwhogavemeaspecialgiftthatwouldchangemylife.
如图所示水平桌面上质量为m的物块放在质量为2m的长木板的左端物块和木板间的动摩擦因数为μ木板和桌面间的动摩擦因数为μ开始时物块和木板均静止若在物块上施加一个水平向右的恒力F已知重力加速度为g下列说法正确的是
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