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在横线上填上“＞”“＜”或“＝”． 130﹣（83﹣17） 130﹣83﹣17．
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在下列横线上填上适当的词使前后构成具有相反意义的量向南走5千米向_______走3千米;
在横线上填上恰当的字使之组成一个成语2分众说纷________听途说油然而____粗制____造
在下面横线上填上适当的语句完成程序 #include＜iostream＞ usingnamesp
如图.根据这一组图形符号中蕴含的内在规律在横线上的空白处填上恰当的图形.
在数字后面的横线上填上合适的单位初二同学平均身高约160一个篮球的质量约0.6.
依题后要求在留空处填上适当的文字使文意显豁贯通1被人理解是幸运的但不被人理解____________
以这一刻如此_______为题横线上填上一个表心情的词语写一段文字至少要用一种修辞着重突出横线上的词
比较大小－2_______－5.请在横线上填上或者=
在下面的横线上填上＞＜或=．80×40÷4 80×40÷4130-80-20 130-8
观察下面的一列数按其规律在横线上填上适当的数.
在横线上填上＞＜或=．＜
在下列横线上填上适当的词使前后构成具有相反意义的量.收入5000元_______2000元;
文题从＿＿到＿＿要求在横线上填上合适的词语然后作文自主立意自选文体不少于800字
在下列横线上填上适当的词使前后构成具有相反意义的量_______9.5吨运出12吨.
在下面的横线上填上适当的数字或图形1246__________2
在下面横线上填上适当的语句完成程序 #include＜iostream＞ usingnamesp
观察下面一列数按某种规律在横线上填上适当的数则第七个数为第个数为
在下面的横线上填上适当的数字或图形1246__________2
仿照例句在横线上填上适当的词语2分例句花朵把春天的门推开了把夏天的门推开了把秋天的门推开了
写篇500字左右的作文题目生活需要提示横线上可以填上欢乐掌声阳光挫折感动坚持
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Shakespeare'sGlobeExhibition&TourisauniqueinternationalresourcetoexploreShakespeare'swork.Openallyearrounditgivesyouanopportunitytolearnmoreaboutthemostfamousplaywright剧作家Shakespeareandhelpsyouseektofurthertheexperienceandinternationalunderstandingofhim. GroupVisitstotheExhibition&Tour *OpeningHours TheatreTours Monday﹣Sunday930a.m.﹣500p.m. Exhibition Monday﹣Sunday900a.m.﹣500p.m. Groupsof15peopleormorearerequiredtopre﹣booktheirvisitandeachgroupwillhaveitsownguideforfree.TomakeareservationpleasefillinaGroupRequestFormandreturnittousviaemail. *ExhibitionandTourPrices Adult＄15.00 Senior60+＄13.50 StudentwithvalidID＄11.50 Child5﹣15＄8.00 ComplimentaryEvery16thpersonfree *Gettinghere Shakespeare'sGlobe21NewGlobeWalkLondonSEl9DTUK Wehavecurrentlyimprovedsecuritywithallbagsbeingchecked.Pleasearriveingoodtimeanddonotbringanylargebagsandcheckthecalendarbeforeyourvisitorcall+4402079021500tofindoutaboutourlatestopeningtimes. Visitorsareadvisedtoarrivebypublictransportorbytaxi.ThereisacarparkonThamesExchangeonthenorthsideofSouthwarkBridgeopen24hourssevendaysaweek.CabsmaybefoundallyearroundonSouthwarkBridge.ItmayalsobepossibletopickoneupfromoutsidetheentrancehallonNewGlobeWalk. *Wheretoeat SwanatShakespeare'sGlobeservesmodernBritishseasonalfoodfordinnerafternoonteaordrinksinourbeautifulbarandrestaurantsetovertwofloorsavailableforpre﹣andpost﹣theatredining. SwanRestaurant Monday﹣Friday12noon﹣230p.m.&600p.m.﹣1030p.m. Saturday12noon﹣330p.m.&600p.m. Sunday12noon﹣900p.m. 1Whencanyoupayavisittotheexhibition? A.Fridayat1200p.m. B.Mondayat800a.m. C.Saturdayat530p.m. D.Sundayat700p.m. 2Ifagroupof20childrenvisittheExhibition&Tourwhatisrequiredforthemtodo? A.Theyneedtohireaguidethemselves. B.Theymustbeaccompaniedbyanadult. C.Theyhavetopay＄160forticketsintotal. D.Theyneedtoemailforareservationinadvance. 3Whichofthefollowingappliestovisitors? A.They'reabletogetataxinearSouthwarkBridge. B.TheycanparkonthesouthsideofSouthwarkBridge. C.Theyarerequiredtodeposittheirbagsbeforeentering. D.It'smoreconvenienttodrivetherethantakingpublictransport. 4WhatcanweknowaboutSwanRestaurant? A.AfternoonteaisnotservedonSunday. B.Itservestraditionalseasonalfoodfordiner. C.Itisclosedfrom3p.m.to5p.m.onworkdays. D.Itservesthreemealsdrinksandafternoontea.
在2016年2月举行的跳水世界杯比赛中我国运动员取得了很好的成就．在跳板比赛中若某运动员可看作质点其速度与时间关系图象如图所示t＝0是其向上起跳瞬间则下列说法正确的是
如图所示一列简谐横波沿x轴正方向传播在x轴上有PMQ三点从波传到x＝5m的点时开始计时已知t1＝0.5s时x＝7m的M点第一次出现波峰．求 ①这列波传播的速度 ②从t＝0时刻起到t2＝0.85s止质点Qx＝9m通过的路程保留至小数点后一位
质量为19Kg速度为3m的冰壶甲与静止的相同冰壶乙发生对心正碰碰后甲以1m/s的速度继续向前滑行．求 ①碰后瞬间冰壶乙的速度大小 ②若碰撞时间为0.1s则乙对甲的作用力大小．
关于下列四幅图说法不正确的是
某实验小组拟使用如图所示装置测量某电源的电动势和内阻E2r待测图中E是一个电动势比较稳定的电源电动势未知E1为标准电源电动势为E1．AB为一根均匀的电阻丝．Ro为已知的定值电阻实验操作步骤如下 1闭合Sl调整滑动变阻器R到合适位置再闭合S2调节电阻丝AB的滑动触头使得电流计G示数为零此时触头在C．记录AC长度LAC此时由于灵敏电流计无示数AC两端电压与E1相等电源El内阻不分压假设电阻丝AC接入的电阻为RAC电阻丝总电阻RAB滑动变阻器接入阻值R稳定电源E内阻为r0表示E和E1的关系．用RAC．RAB．REro表示 2断开S2闭合S3其他不变调节电阻丝AB的滑动触头使得电流计G示数为零此时触头在D记录AD长度LAD根据前两步骤即可测量待测电源的电动E2＝．用LACLADE1表示灵敏电流计示数为零时接入电阻丝长度LAx与待测电动势．填成正比例成反比例无关 3再闭合S4其他不变调节电阻丝AB的滑动触头使得电流计G示数为零此时触头在E未画出记录AE长度LAE此时AE两端电压电动势El填等于不等于待测电源E2的内阻r＝．用LADLAERo表示
SpecialEventsThisWeekend CaptainGoodFellow Doyourchildrenenjoyinterestingstoriesfunnygamesandexcitingdances?CaptainGoodFellowwillbereadytoteachallthesethingstochildrenofallagesattheCityTheatreonSaturdaymorningat1000 WalkingTouroftheTown ForgetyourworriesonSaturdaymorning.Takeabeautifulwalkandlearnaboutlocalhistory.MeetatthefrontentranceofCityHallat930.Wearcomfortableshoes! FilmsattheMuseum TwoEuropeanfilmswillbeshownonSaturdayafternoonatMuseumTheatre.SeeBrokenWindowat130.TheWorkerswillbeat345.Forfurtherinformationcall4987879. InternationalPicnic Areyoutiredofeatingthesamefoodeveryday?CometoCentralParkonSaturdayandenjoyfoodfromallovertheworld.Deliciousandnotexpensive.Noonto500pm. DoYouWanttoHearTheZoo? TheZooapopularrockgroupfromAustraliawillgivetheirfirstUSconcerttomorrownightat800atRoseHallCityCollege. 1IfyouaregoingontheWalkingTourdon'tforget. A.yourcomfortableshoes B.yourbeautifulwalk C.yourlearningaboutlocalhistory D.yourworries 2Wherecanyouseemovies? A.AtCityCollege. B.AtMuseumTheatre. C.AtCityTheatre. D.AtCentralPark. 3YoucanprobablyeatChineseItalianandArabfood. A.atCityHall B.atRoseHall C.atCityCollege D.atCentralPark
OnacoldNovemberafternoonmymotherandIwerewalkinghomefromapizzastore.Weweredressedwarmlyand1withtherentedvideo.Iwasfeelingalittle2asIwascarryingourshoppingbagsofsnacksandthe3.TheyweresoheavythatIdecidedto4somethings.SoIstartedtowalktowardsthegarbagecan垃圾筒5Inoticedapoormanwalkinghisbikeoutoftherestaurantinfrontofus.He6apaperbagwithhisdirtyhand.Heheadedovertoanothernearbygarbagecanandstarted7it. Isuddenlyfeltvery8becauseIwasabouttodoawaywithanewdrinkjust9itwasheavy.Iknewthismanwouldtakeallhecould10soIwalkeduptohimand11thedrinkandsomesnackstohim.Themanlookedup12andtookwhatIgavehim.Ahugesmilespread13hisfaceandthiscausedmetofeelindescribable14.IfeltlikeI15behappierwithmyselfbutthenhesaidThisismyson'sluckyday! Withthathe16mehappilyandstartedoffonhisbike.Ievenheardhim17asongasherodeaway.IgotawarmfeelinginsideandIknewIhaddonesomethinggoodforthemanandhisfamily.Inowunderstandwhatis18bythesayingGivingisgetting. SincetheneverytimeIhavethe19todosomethingnicetheimageoftheman'shappinesscausedbymysmallgiftappearsinmymind.Thisisthe20ofcharity. 1A.equipped B.covered C.done D.offered 2A.upset B.happy C.tired D.excited 3A.video B.books C.pizza D.clothes 4A.sendoff B.throwaway C.putaway D.sendout 5A.after B.when C.before D.while 6A.owned B.presented C.held D.sought 7A.goinginto B.findingout C.lookingthrough D.workingout 8A.stupid B.guilty C.disappointed D.happy 9A.since B.until C.because D.when 10A.get B.search C.hear D.see 11A.dropped B.kept C.turned D.handed 12A.sadly B.coldly C.thankfully D.patiently 13A.in B.across C.by D.through 14A.regret B.satisfaction C.failure D.curiosity 15A.couldn't B.shouldn't C.needn't D.mustn't 16A.smiled B.told C.saw D.thanked 17A.singing B.whispering C.listening D.making 18A.referred B.said C.meant D.spoken 19A.time B.chance C.idea D.effort 20A.power B.effect C.result D.mystery
空间分布有竖直方向的匀强电场现将一质量为m的带电小球A从O点斜向上抛出小球沿如图所示的轨迹击中绝缘竖直墙壁的P点．将另一质量相同电荷量不变电性相反的小球B仍从O点以相同的速度抛出该球垂直击中墙壁的Q点图中未画出．对于上述两个过程下列叙述中正确的是
Twodeerjumpedoutinfrontof16﹣year﹣oldAmandaFloyd'scar.Shesteppedonthebrakestoppingthecarjustintime.Butlatershestartedtexting.Distracted分心的Amandaturnedleftandrightthencrashedintoanothercar.Luckilyshewasn'tinarealcar﹣﹣shewasinadrivingsimulator模拟器atRooseveltHighSchoolOhioUS.IneverreallyrealizedthatcarsmakeaturnthatmuchAmandaaJuniorsaid.Sheaddedthatshewouldn'ttextwhiledrivinganymore. TheOhioDepartmentofTransportationODOTandStateHighwayPatrolbroughtthesimulatortotheschool.Theysaidtheywantedtohelpstudentslearnaboutthedangerofdrivingwhiledrunkwhiletextingorwhiletalkingonthephone. AccordingtotheNationalHighwayTrafficSafetyAdministrationdistracteddrivingclaimed34501ivesin2016alone.Expertsbelievetheactualfigureisprobablyhigher. Thesimulatorisbasicallyacomputerprogram.Likemanycomputergamesitwasahitwiththestudents.Theylinedupandcrowdedaroundtowatcheachothertaketurns.Thesimulatorhasasteeringwheel!方向盘brakeandgaspedal油门踏板.Itismadeupofthreelargecomputerscreensonatable. Studentschooseadistractionsuchasdrivingwhiledrunkortexting.Theyalwayscrashofcourse.Thentheyarepulledoverbythepolicetobetaughtthebadresultsoftheirdrivinghowmuchdamagethey'vecausedwhattheirfineisifanyonediedintheaccidentandifthey'regoingtogotoprison. ItteacheshowtodrivewithoutbeingontheroadsaidShanteThompson16.Shehadjustcrashedintoadeer. ODOTspokesmanJustinChesnicsaidhundredsofkidshavegonebehindthewheelsofar.Hesaidevenmorehavebenefitedfromwatchingtheirclassmates.Drivingissuchamajorresponsibilitysotakeitseriouslyhesaid.Putawayyourcellphone.Alotoftheaccidentsouttherearebecauseofdistracteddriving.Itcannotonlychangeyourlifebutitcanchangesomeoneelse'slifeforever.Theresultsareserious. 1WhatdoestheauthorintendtodoinParagraphOne? A.Introducethetopicofthetext. B.Illustratetheauthor'spointofview. C.Providesomeadviceforthereaders. D.Offersomebackgroundinformation. 2WhyisthedrivingsimulatorprojectintroducedtoRooseveltHighSchool? A.Itteststhestudents'abilitytostayfocused. B.Itgetsstudentstohavefunbetweenclasses. C.Itteachesstudentshowtodealwithtrafficaccidents. D.Itmakesstudentsawareofthedangersofdistracteddriving. 3Whatcanweknowaboutthedrivingsimulator? A.Itisconnectedtothelocalpolicestation. B.Itisarealcarbuthaslargecomputerscreens. C.Itattractsthestudents'interestasacomputerprogram. D.Itbenefitsthestudentswhouseitmorethanthosewhoonlywatch. 4Whatisthemainideaofthepassage? A.TrafficrulesinOhioUS. B.Dangerofdistracteddriving. C.Simulateddrivingforstudents. D.Advantagesofcomputergames.
如图所示是一名登山运动员的攀登陡峭雪壁的情形如果认为峭壁的平面是竖直的平面冰面是光滑的腿与峭壁面是垂直的轻绳与壁面的夹角为30°运动员重为80kg．则细绳给人的张力大小T A．T＝N B．T＝800N C．T＝N D．T＝1600N
为了更方便监控高温锅炉外壁的温度变化在锅炉的外壁上镶嵌一个导热性能良好的汽缸汽缸内气体温度可视为与锅炉外壁温度相等．汽缸开口向上用质量为m＝1kg的活塞封闭一定质量的理想气体活塞横截面积为S＝1cm2．当汽缸内温度为300K时活塞与汽缸底间距为L活塞上部距活塞L处有一用轻质绳悬挂的重物M．当绳上拉力为零时警报器报警．已知室外空气压强p0＝1.0×105Pa活塞与器壁之间摩擦可忽略．求 ⅰ当活塞刚刚碰到重物时锅炉外壁温度为多少 ⅱ若锅炉外壁的安全温度为900K那么重物的质量应是多少
如图所示三个质量相同的均匀带电绝缘球ABC用三根轻质细线连接小球所在空间存在水平方向的匀强电场三根细线与竖直方向的夹角分别为30°45°60°不考虑小球之间的相互作用则下列说法中正确的是
如图左边为一带正电的小球右边为一金属圆环外壳接地电场线的分别如图所示则下列说法正确中的是 A．a点的电势高于b点的电势 B．c点的电场强度大于d点的电场强度 C．若将一负试探电荷由c点移到d点电势能减少 D．若将一正试探电荷沿金属环的外表面移动半圈则电场力做正功
如图一定质量的理想气体由状态a沿abc变化到状态c吸收了340J的热量并对外做功120J．若该气体由状态a沿adc变化到状态c时对外做功40J则这一过程中气体填“吸收”或“放出”J热量．
Iwasdrowningindepression.SeveralmonthsagoI'd41allmysavingsandincomefrommyjob.SoImovedtoafarminthemountainshopingtoforgetmy42.HereIthoughteverythingwasgreyandIcouldn'tseeanyother43. Thenonedaythephoneranganditwasaladyontheotherend44purchasinghensanddirections.Igaveherthe45andsetupan46thefollowingmorning.AndthenshetoldmeaboutJackherlittleboywithautism自闭症.Shewantedto47himandIsaidyes. Thenat11a.m.thenextmorningacar48.IheadedforourgateandbeforeIcouldreachitalittleboywasrunningtowardsme49callingoutJanet﹣I'mJack.I50himcarryingadinosaurbook.Wewerecarriedoffintothefarmwithdinosaur51. Wereachedthehenarea.Jackchosethreebabyhensandhetoldthemthey'd52withhimforever.AsJackwaslettingthebabiesknowhowwellhe'd53themmyfancyblackroostercameuptous.IaskedJackifheeverheldaroosterand54Jackwassittingonapieceofwoodwiththeroosteronhislap55ofthemcooing咕咕叫ateachother. We56thehenswithJack'sparentsbehindus.JackandIweredeepin57aboutanimalsuntilwegottotheircar.FinallyIsaid58toJackandweallwaved. Thelightdrovedownmydriveway59somethingpleasantwasleftbehind.AndIheldontoJack'slightuntilIstarteda60lifeformeandmyanimals. 41.A.reduced B.spent C.preserved D.lost 42.A.memories B.worries C.fears D.challenges 43.A.sign B.shadow C.color D.design 44.A.askingabout B.decidingon C.insistingon D.puttingforwards 45.A.instruction B.opinion C.price D.information 46.A.schedule B.appointment C.business D.record 47.A.join B.comfort C.bring D.treat 48.A.stopped B.crashed C.brokedown D.droveoff 49.A.nervously B.shyly C.unwillingly D.excitedly 50.A.imagine B.remember C.recommend D.watch 51.A.statements B.origins C.stories D.reports 52.A.live B.play C.study D.wander 53.A.dealwith B.worryabout C.makeuseof D.takecareof 54.A.suddenly B.immediately C.slowly D.carefully 55.A.all B.none C.both D.neither 56.A.kept B.approached C.caught D.left 57.A.thought B.conversasion C.love D.life 58.A.sorry B.thanks C.goodbye D.hello 59.A.but B.as C.since D.for 60.A.successful B.healthy C.balanced D.new
如图所示电源电动势为E内阻为r电路中的R2R3分别为总阻值一定的滑动变阻器R0为定值电阻R1为光敏电阻其电阻随光照强度增大而减小当开关S闭合电容器中一带电微粒恰好处于静止状态下列说法中正确的是
请修改下面的短文.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. InDecember9anEnglishspeechcontestisheldinourcity.36studentsfrom15 schoolstookpart.ThecontestmadeupofthreeroundsanEnglishspeechanswering thequestionsandatalentshow.EverystudentmadeaexcellentspeechinEnglish whichthemewasaboutTheBeautyofOurCity.Whentheyansweredthequestions theyfeltconfidentlyofsucceeding.Inthetalentshowcolorfulperformancesgivenbyher weremorethanattractive.There'snodoubtaboutthatthiscontestwasahugesuccess. Throughtheactivitythestudentshavelearntalot.Theyhavenotonlyimprovedtheir speakingEnglishandalsoenjoyedasenseofachievement.
“用DIS研究加速度与力的关系”的实验装置如图a所示实验中用所挂钩码的重量作为细线对小车的拉力F通过增加钩码的数量多次测量可得小车运动的加速度a和所受拉力F的关系图象他们在轨道水平和倾斜的两种情况下分别做了实验得到了两条a﹣F图线如图b所示． 1图线填“①”或“②”是在轨道右侧抬高成为斜面情况下得到的 2在轨道水平时小车运动的阻力Ff＝N 3图b中拉力F较大时a﹣F图线明显弯曲产生误差．为避免此误差可采取的措施是． A．调整轨道的倾角在未挂钩码时使小车能在轨道上匀速运动 B．在增加钩码数量的同时在小车上增加砝码使钩码的总质量始终远小于小车的总质量 C．将无线力传感器捆绑在小车上再将细线连在力传感器上用力传感器读数代替钩码的重力 D．更换实验中使用的钩码规格采用质量较小的钩码进行上述实验．
Itisnotassimpleasopeningthedoorandhittingthetrackinwinter.Thereareafewthingsyoucandotoensureyouaregettingthemostoutofyourrunandimporantlynotdoingmoreharmthangood. Warmupcooldown 1Yourmusclesneedsometimetowarmupwhenit'scoldsotakeiteasywhenyousetoffanddoafewstretches伸展onceyou'refinished. Drinkwater Youmightnotfeelhotbutthat'sbecausesweatevaporates蒸发morequicklyintothechillydryair.Sobesuretodrinkwaterbeforeduringandaftercold﹣weatherworkouts.2Abeltbottleconvenientlyattachestoyourwaistsoyoudon'thavetocarryitandcanhaveadrinkwheneveryoufeellikeit. 3Runningincottonisabadidea.Wearthinbreathablelayersofsynthetic合成的clothingthathelpprotectyoufromthewindandsnowbutstillletoutheatandmoisture水分.Thirtypercentofyourbodyheatescapesthroughyourhandsandfortypercentthroughyourhead.Wearahatorbeanie无边小便帽andglovessoyourcirculatorysystemcandistributewarmbloodtotherestofyourbody.4 Runintothewind 5ObviouslyitwillbeaneasierpassagehomewithsomeextrahelpfromMotherNature.Butmoreimportantlyyouwon'thavethewindinyourfaceforthesecondhalfofyourrunwhenyouaremorelikelytobesweatingandcatchachill. A.Dressright. B.Keepwarm. C.Don'tgotoofasttoosoon. D.Startandfinishinthesameway. E.Don'twaittodrinkwateruntilyoufeelthirsty. F.Headoutintothewindandcomehomewithitatyourback. G.Onreallycolddayswearamaskorscarfoveryourmouthtoprotectyourface.
如图所示在xOy平面内存在均匀大小随时间周期性变化的磁场和电场变化规律分别如图乙丙所示规定垂直纸面向里为磁感应强度的正方向沿y轴正方向电场强度为正．在t＝0时刻由原点O发射初速度大小为υ0方向沿y轴正方向的带负电粒子．已知u0t0B0粒子的比荷不计粒子的重力． 1t＝时求粒子的位置坐标 2若t＝5t0时粒子回到原点求0～5t0时间内粒子距x轴的最大距离 3若粒子能够回到原点求满足条件的所有E0值．
如图所示固定的水平光滑金属导轨间距为L左端接有阻值为R的电阻处在方向竖直磁感应强度为B的匀强磁场中质量为m的导体棒与固定弹簧相连放在导轨上导轨与导体棒的电阻均可忽略．初始时刻弹簧恰处于自然长度导体棒具有水平向右的初速度v0．在沿导轨往复运动的过程中导体棒始终与导轨垂直并保持良好接触． 1求初始时刻导体棒受到的安培力． 2若导体棒从初始时刻到速度第一次为零时弹簧的弹性势能为Ep则这一过程中安培力所做的功W1和电阻R上产生的焦耳热Q1分别为多少导体棒往复运动最终将静止于何处从导体棒开始运动直到最终静止的过程中电阻R上产生的焦耳热Q为多少
如图甲所示理想变压器原线圈匝数n1＝2200匝副线圈匝数n2＝100匝电流表电压表均可视为理想交流电表定值电阻R＝10Ω二极管D正向电阻等于零反向电阻无穷大．变压器原线圈接人如图乙所示的交流电压下列说法正确的是
质量为M＝1kg的木板静止在粗糙水平面上木板与地面间的动摩擦因数为μ1在木板的左端放置一个质量为m＝1kg大小可忽略的铁块．铁块与木板间的动摩擦因数为μ2取g＝10m/s2．若在铁块右端施加一个从0开始增大的水平向右的力F假设木板足够长铁块受木板摩擦力Ff随拉力F的变化如图所示．则两个动摩擦因数的数值为
某同学设计了一个电磁推动加喷气推动的火箭发射模型其工作原理如图所示．竖直固定在绝缘底座上的两根长直光滑金属导轨间距为L导轨间加有垂直导轨平面向里的匀强磁场B．绝缘火箭支撑在导轨间总质量为m燃料室中的金属棒EF电阻为R通过电刷与导轨保持良好接触．引燃装置下方的推进剂迅速推动刚性金属棒CD电阻可忽略且和导轨接触良好沿导轨向上运动在棒EF中激励出强电流产生电磁推力加速火箭经过时间△t回路CDFE面积减少△S火箭刚好脱离导轨．当火箭脱离导轨时电阻R产生的焦耳热使燃料燃烧形成高温__气体燃烧室下方的可控喷气孔打开喷出燃气进一步加速火箭．不计空气阻力不计导轨的电阻 1求△t时间内棒EF中感应电流的平均值I及火箭脱离导轨时的速度V0 2若火箭总质量m＝10kg脱离导轨时的速度V0＝20m/s喷气孔在极短的时间内向下喷出质量m′＝2kg的燃气燃气相对喷气后火箭的速度为u＝100m/s．求喷气后火箭的速度Vl及喷气过程燃料释放的内能Q 3在第2问中若喷气孔将m′＝2kg的燃气分两次喷出每次喷出燃气的质量为m′/2燃气相对喷气后火箭的速度均为u＝100m/s求喷气后火箭的速度V2．
AboutsixyearsagoItookajobsomepeoplewouldconsideradreamjob.Atthetimeitwasconsideredasecurejobwithgreatbenefits.AstheyearspassedIrealizedIwasjustrepeatingeveryday.SoIdecidedtobeginbuildingmyownbusiness. Iknowwhatyouarethinking﹣there'snosecurityinthat!YeahIknow.IhaveheardthatandaboutonethousandotherreasonswhyIshouldhavecontinuedworkingattheregularjob.ButIdon'tregretmydecision.Iknowmanypeopleouttherealsowanttostarttheirownbusiness.Herearesomethingsyouneedtoknowbeforebreakingthemouldandleavingyour9﹣5toconcentratefull﹣timeonyourdreamThere'sneveraperfecttime.Somethingwillalwayscomeuptopreventyoudefer推迟yourdecisionchangeyourminddiscourageyouorsetyoubackabouttenyears. Havinganexperiencedandtrustedadviserisimportant.Why?Becauseifyoufindonewithasimilarthoughtprocessitislikelythattheyhavewalkedinthepathyouaretaking.Payattentiontotheiradviceasitcansaveyourheartache. Havingallthedetailsfiguredoutisimpossible.Therearesomanythingsyouhavetodobeforelaunchingoutintothedeep.Eitherwaytherearerisksinvolved.Youcanhaveallofyourinsecuritiessolvedandguesswhat!Somethingwillcomeuptomakeamessofeverything.Keepmovingon.Pressthroughit. Theclosertheyarethedeepertheystab.Notallofyourfriendswillcelebrateyourchange.Therewillbethosewhowouldratherdiscourageyouandtellyouhowyouwillnevermakeitbutalltheywouldhavetodoissupportyou.It'syourdream.It'syourresponsibility.Ifyouallowthewordsofotherstokeepyoufromityouweren'tsuitableforit. 25.Whydidtheauthordecidetostarthisownbusiness? A.Hegotfedupwiththeregularjob. B.Hewasencouragedbypeoplearoundhim. C.Hethoughthispreviousjobwasoutofdate. D.Hedidn'tmakegoodmoneyfromtheregularjob. 26.Whatdoestheauthormeanbybreakingthemouldinthesecondparagraph? A.Notobeyingtherulesatwork. B.Learningnewwaystodothejob. C.Gettingoutoftheoldworkplace. D.Improvingtheworkingenvironment. 27.Whichstatementwilltheauthoragreewith? A.Preparationisn'tthatimportantinstartingabusiness. B.Oneshouldjustdoitifhewantstostartabusiness. C.Moredetailsshouldbeconsideredtoreducerisks. D.Oneshouldtakeothers'wordsseriously. 28.What'stheauthor'spurposeinwritingthetext? A.Toexplainwhyhestartedhisownbusiness. B.Tomakehisbusinessknowntomorepeople. C.Togiveadvicetothosewantingtoworkforthemselves. D.Tocomparehavingaregularjobwithstartingabusiness.
假设你是李华最近有关人类带着地球逃离即将毁灭的太阳系去寻找新家园的科幻片流浪地球热映你写了封e﹣mail邀请你的美国朋友John下周六晚上7点半在环球影院GlobalCinema见面一起观看晚上8点的电影. 内容包括 1.电影的简介和你的看法 2.观影的时间和地点 3.… 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. 参考词汇1.session场次 DearJohn How'severything?﹣﹣﹣﹣ Bestwishes. Yours LiHua
Whenwereadapoem.weoftenimaginewhatthepoets1thinkwhentheywroteorwhattheyweredoingatthetime.Thesethoughtsletusconnectwiththewordsbetterasifwe'dcreatedthepoem2we.Willapoemstillmeanasmuchifacomputewritesit? By3useagorithms算法computerscannowcreateallkindsoftextincludingresearchpapersbooksnewsstoriesandevenpoems.Computer﹣generatedpoemsmightbecorrectinbothgrammarandstyle4somesaytheystilllack5createandtruemeaning. AustralianresearcherOscarSchwartzcreatedawebsite6callbotornot.Onhissiteyoucanreadpoemsandguesswhetherthey7writebyahumanoracomputer.SchwartzrecentlygaveaspeechatTedXSydneyin8hestatedthatsomeofthewebsite'spoemswereableto9foolish65percentofhumanreaders. Hesaidthatonhiswebsitehehopedpeoplewouldquestionthedifferencebetweenhumansand machines一andbeabletoidentifywhatitis10makesushuman.
Capsaicin辣椒素canbeusedasmedicinetohelpreducepain.Itmayseemstrangethatwhatcausespainmightalsomakepaingoaway.Yetit'strue. TiborRohacsisamedicalresearcheratNewJerseyMedicalSchoolinNewark.Herecentlystudiedhowcapsaicinworkstoreducepain.ResearchersalreadyknewthatwhencapsaicinturnsontheTRPV1proteinit'sliketurningonabrightlight.Wheneverthelightisonthepersonexperiencespain.Rohacsandhiscolleaguesthendiscoveredachemicalchainreactionthatlatersilencesthispain.HesaysThelightshinessobrightlythatafterawhilethebulbburnsout.ThentheTRPV1proteincan'tturnbackonagain.Whenthishappensthebrainnolongerfindsoutaboutthefeelingofpain. Thehumanbodyisgoodatrepairingitselfhowever.Eventuallythepainwillfixthispainsystemandcanonceagainsendpainalerts警报tothebrain.HoweveriftheTRPV1proteinisactivated激活oftenthepainsystemmaynotgetachancetorepairitselfintime.Thepersonwillonlyfeeldiscomfortorburningatfirst.Thenheorshewillexperiencerelieffromothertypesofpain.Forexamplepeoplewitharthritisregularlyhavepainintheirfingerskneeshipsorotherjoints.Rubbingacreamcontainingcapsaicinontothepainfulareamayburnatfirst.Afterawhilehowevertheareawillbecomenumb. Rohacswarnsthatcapsaicincreamsdon'tseemtogetdeeplyenoughintotheskintototallyremovepain.Hesaysotherresearchersarecurrentlytestingcapsaicinbandagesorinjections.Theywouldlikelydoabetterjobathaltingpain.Unfortunatelytheytendtohurtalotmorethanacream﹣atleastinthebeginning.Someonewhocantoughoutthediscomforthowevercouldfeelnopaininthefollowingseveralweeksnothours. 32.WhathappenstothepersonwhentheTRPV1proteinisturnedon? A.Heloseshissenses. B.Hesuffersphysicalpains. C.Heslightlysensesdiscomfort. D.Hegetsusedtothefeelingofpain. 33.Whenmaythepainsystemnotrecover? A.WhentheTRPV1proteinburnsout. B.Whenthebraincannotreceivepainalerts. C.WhentheTRPV1proteinisturnedonfrequently. D.Whendifferenttypesofpainoccuratthesametime. 34.Whatistheproblemofcapsaicincreamswhentheyareusedtoreducepain? A.Theyarenotveryeffective. B.Theycauseburnsintheskin. C.Theycausetoomuchdiscomfort. D.Theycanstoppainforjustseveralweeks. 35.Whatdoestheunderlinedwordhaltinginthelastparagraphmean? A.Finding.B.Feeling.C.Hiding.D.Stopping.
Ifyouwishtobecomeabetterreaderherearefourimportantthingstorememberaboutreadingrate ●Knowingwhyyouarereadingorwhatyouarereadingtofindoutwilloftenhelpyoutoknowwhethertoreadrapidlyorslowly. ●Somethingsshouldbereadslowlythroughout.Examplesaredirectionsformakingordoingsomethingarithmeticproblemsscienceandhistorybookswhicharefullofimportantinformation.Youmustreadsuchthingsslowlytoremembereachimportantstepandunderstandeachimportantideas. ●Somethingsshouldbereadrapidlythroughout.Examplesaresimplestoriesmeantforenjoymentnewslettersfromfriendspiecesofnewsfromlocalorhome﹣townpaperstellingwhatishappeningtofriendsandneighbors. ●Insomeofyourreadingyoumustchangeyourspeedfromfasttoslowandslowtofastasyougoalong.Youwillneedtoreadcertainpagesrapidlyandthenslowdownanddomorecarefulreadingwhenyoucometoimportantideaswhichmustberemembered. 1Theunderlinedwordrateinthefirstsentencemeans. A.fast B.slow C.speed D.skill 2Whichshouldbereadslowlyaccordingtothepassage? A.Storiesforenjoyment B.Arithmeticproblems C.Lettersfromfriends D.Newsfromhometownnewspapers 3Howfastshouldweread? A.Thefasterthebetter. B.Themoreslowlythebetter. C.Neithertoofastnortooslow. D.Itdependsonwhatwearereading. 4AccordingtothepassagewhichofthefollowingisNOTtrue? A.Readslowlywhenyouarereadingsomethingimportanttoyou. B.Readfastwhenyouarereadingsomethingunimportanttoyou. C.Readthematerialsthatyouareinterestedinslowly. D.Readthematerialsthatyouareinterestedinfast.
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