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甲图是电池电动势E=9V的欧姆表的电路图,现利用欧姆表和乙电路图来测量一额定电压为10V的电解电容器(有正负极)的电容值,请补全下面的实验步骤,完成实验要求.所有数据均取2位有效数字.(1)按乙图电...
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高三下学期物理《》真题及答案
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为了较为精确测量某一定值电阻的阻值兴趣小组先用多用电表进行粗测后用伏安法精确测量.现准备了以下器材A
请完成以下两小题1图a中螺旋测微器读数为mm.图b中游标卡尺游标尺上有50个等分刻度读数为cm.2欧
1用多用电表测未知电阻阻值的电路如图甲所示电池的电动势为E.内阻为rR.0为调零电阻R.g为表头内阻
2016·广西来宾调研9分某同学用以下器材接成如图甲所示的电路并将原微安表盘改成如图乙所示的欧姆表盘
11.某同学想通过一个多用电表中的欧姆挡直接去测量某电压表量程为10V的内阻大约为几十千欧该多用电表
为了测量一个欧姆表内部电源的电动势某同学仅利用提供给他的一个量程满足要求内阻约2千欧的电压表完成了测
1多用电表测未知电阻阻值的电路如图a所示电池的电动势为E.内阻为rR0为调零电阻Rg为表头内阻电路中
如图所示欧姆表的中值电阻为25Ω×1档选×100档调零后测某电阻的阻值时指针指在Ig处已知欧姆表内电
如图是一个多用表欧姆档内部电路示意图电流表满偏电流0.5mA内阻10Ω电池电动势1.5V内阻1Ω变阻
在练习使用多用表时某同学将选择开关拨至×10Ω档时欧姆表的内部结构可简化成图甲中虚线框内的电路其中定
某欧姆表的电阻刻度是按电池电动势为1.5V刻度而成的满偏是电流lg=10mA当电池电动势下降到1.2
如左下图是欧姆表的原理图电流表的满刻度电流值是125微安电池的电动势是1.5伏若把表盘改画成欧姆数的
某物理学习小组的同学在研究性学习过程中通过一块电压表和一块多用电表的欧姆挡接成电路就能一次性既能测出
把量程为3mA的电流表改装成欧姆表其结构如图所示其中电源电动势E.=3V改装后将原来电流表3mA的刻
某物理兴趣小组准备自制一只欧姆表现有以下实验器材A.I.g=l00μA的微安表一个B.电动势E.=1
如图所示是欧姆表的原理图电流表表量程是30mA电池的电动势是1.5V滑线变阻器R的作用是.该欧姆表中
把一个量程为6mA的电流表改装成欧姆表如图已知电源电动势E=3VA.B端分别接黑红表笔则电流表2mA
某同学想通过一个多用电表中的欧姆挡直接去测量某电压表量程为10V的内阻大约为几十千欧该多用电表刻度盘
用欧姆表测电阻的优点是快捷方便缺点是读数不够精确尤其是当表内电池的电动势下降后测出的电阻值与真实值之
把一只量程为I.g=6mA内阻为rg=100Ω的电流表改装成欧姆表所用电池的电动势E=3V内阻可忽略
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OvertheyearsIhavereceivedmanyChristmasgifts.HoweverthebestoneI'veeverreceivedwaspresentedbya41IneverknewhisnameandIonlyhad42withhimforlessthan60secondsbutthemomentchangedthe43IthinkaboutpeopleandChristmas. I44BlackFridaysales.It'softenlotsofpeople45theshopsmerelytopickupbargains.Theirintentionsarecompletelyunrelatedtothe46timeofyear. ItwasoneBlackFridaymorningseveralyearsago47mywifeandIwenttothelocaldepartmentstoretopurchaseachild's48forourson.Westoodwithaverylargecrowd49forthemanagetoblowthewhistle.Onhearingthe50peoplewereallscrambling争先恐后togetthebargains.I51myopportunityandliftedoneoftheboxescontainingbikes52Ifeltsomemildresistance.Ilooked53toseeoneofthelargestgentlemenI'deverseeninmylife.Frighteningwasnottheworldto54hispresence.Iunwillingly55theboxbuttomysurprisehegentlypusheditbackin56direction.Oureyesmadecontactandhegavemea57smilesayingMerryChristmas.MywifeandIwenttothe58andpaidforthebike.AllthewayhomeIwasthinkingthatthismomentwasmuchthebestChristmasgiftI'deverreceived.Asimple59ofkindnessfromastranger60allstereotypes成见andprejudicesImayhavehad.I'llneverforgetit. 41.A.friend B.colleague C.stranger D.brother 42.A.fun B.argument C.conversation D.contact 43.A.way B.habit C.attitude D.pattern 44.A.enjoy B.forget C.hate D.expect 45.A.breakinginto B.crowding C.gettinginto D.wandering 46.A.joyful B.discouraging C.annoying D.busy 47.A.since B.when C.before D.until 48.A.toy B.book C.box D.bike 49.A.preparing B.looking C.waiting D.crying 50.A.whistle B.bell C.screams D.cheers 51.A.missed B.saw C.offered D.quitted 52.A.Gradually B.Immediately C.Occasionally D.Suddenly 53.A.down B.up C.through D.forward 54.A.introduce B.state C.describe D.say 55.A.takeaway B.takedown C.putaway D.putdown 56.A.his B.its C.my D.another 57.A.friendly B.regretful C.frightening D.special 58.A.exit B.checkout C.store D.stand 59.A.act B.behavior C.word D.movement 60.A.deepened B.replaced C.cleaned D.removed
BlackFridayisthedayafterThanksgivingDayintheUSAfallingontheFridayafterthefourthThursdayinNovember. 36 ManypeoplehaveadayoffworkorchoosetotakeadayfromtheirannualleaveonBlackFriday.Somepeopleusethistomaketripstoseefamilymembersorfriendswholiveinotherareasortogoonvacation.ShoppingforChristmaspresentsispopularonBlackFriday.Manystoreshavespecialoffersandlowertheirpricesonsomegoodssuchastoys. Publiclife 37.ManypeopletakeadayoffonthedayafterThanksgivingDay.ManyorganizationsalsoclosefortheThanksgivingweekend. Publictransitsystemsmayrunontheirnormalscheduleormayhavechanges.SomestoresextendtheiropeninghoursonBlackFriday.38. Background BlackFridaythedayafterThanksgivingDayisoneofthebusiestshoppingdaysintheUSA.39.OnetheoryisthatthewheelsofvehiclesinheavytrafficonthedayafterThanksgivingDayleftmanyblackmarkingontheroadsurfaceleadingtothetermBlackFriday. TheothertheoryisthatthetermBlackFridaycomesfromanoldwayofrecordingbusinessaccounts.40.ManybusinessesparticularlysmallbusinessesstartedmakingprofitsbeforeChristmas.ManyhopedtostartshowingaprofitmarkedinblackinkonthedayafterThanksgivingDay. MorerecentlyBlackFridayhasbeenexportedtonationsoutsideofNorthAmericasuchastheUnitedKingdombymajoronlineretailerslikeAmazonorApple.In2011IBMreportedonlineBlackFridaysaleswereupby24.3%accordingtoastudythatincludes500retailers. A.People'sactivities. B.HistoryofBlackFriday. C.Losseswererecordedinredinkandprofitsinblackink. D.A.busyshoppingdayisaholidayinsomestates. E.Therecanalsobejamsonroadstopopularshoppingdestinations. F.TherearetwopopulartheoriesastowhyitiscalledBlackFriday. G.BlackFridayisnotafederalholidaybutapubliconeinsomestates.
已知水杨酸酯E为紫外吸收剂可用于配制防晒霜.E的一种合成路线如图 已知D的相对分子质量是130.请回答下列问题 1一元醇A中氧的质量分数约为21.6%.则A的分子式为结构分析显示A只有一个甲基A的名称为 2第④步的反应条件为写出E的结构简式 3B能与新制的CuOH2发生反应该反应的化学方程式为 4写出同时符合下列条件水杨酸的同分异构体的结构简式 a能与FeC13发生显色反应b能与银氨溶液反应c能发生水解反应 d核磁共振氢谱显示有四组峰.且峰面积比为1221
已知定义在[-21]上的某连续函数即函数图象连续不断y=fx部分函数值如表 有同学根据表中数据作出了下列论断 ①函数y=fx在[-21]上单调递增 ②函数y=fx在[-21]上有且只有一个零点 ③方程fx=0在[-21]上必无实根 ④方程fx-1=0必有实根. 其中正确的论断个数是
对于函数fx与gx若存在λ∈{x∈R|fx=0}μ∈{x∈R|gx=0}使得|λ-μ|≤1则称函数fx与gx互为“零点密切函数”现已知函数fx=ex-2+x-3与gx=x2-ax-x+4互为“零点密切函数”则实数a的取值范围是.
已知函数fx=1+x-x2ex. Ⅰ求函数fx的单调区间 Ⅱ求函数fx的极值 Ⅲ求函数fx在区间[-32]上的最大值和最小值.
设abc∈R且a>b则
i为虚数单位复数z满足z1+i=i则复数z为
随着经济全球化信息化的发展企业之间的竞争从资源的争夺转向人才的竞争.吸引留住培养和用好人才成为人力资源管理的战略目标和紧迫任务在此背景下某信息网站在15个城市中对刚毕业的大学生的月平均收入薪资和月平均期望薪资做了调查数据如图所示. Ⅰ若某大学毕业生从这15座城市中随机选择一座城市就业求该生选中月平均收入薪资高于8500元的城市的概率 Ⅱ现有2名大学毕业生在这15座城市中各随机选择一座城市就业且2人的选择相互独立记X为选中月平均收入薪资高于8500元的城市的人数求X的分布列和数学期望EX Ⅲ记图中月平均收入薪资对应数据的方差为s12月平均期望薪资对应数据的方差为s22判断s12与s22的大小.只需写出结论
化学小组采用类似制乙酸乙酯的装置如下图用环己醇制备环己烯. 已知 1制备粗品 将12.5mL环己醇加入试管A中再加入1mL浓硫酸摇匀后放入碎瓷片防止暴沸缓慢加热至反应完全在试管C内得到环己烯粗品. ①导管B除了导气外还具有的作用是. ②试管C置于冰水浴中的目的是. 2制备精品 ①环己烯粗品中含有环己醇和少量酸性杂质等.加入饱和食盐水振荡静置分层环己烯在层填“上”或“下”分液后用填入编号洗涤. A.KMnO4溶液B.稀H2SO4C.Na2CO3溶液 ②再将环己烯按上图装置蒸馏冷却水从口进入填“g”或“f”.蒸馏时要加入生石灰其目的是. ③收集产品时控制的温度应在左右实验制得的环己烯精品质量低于理论产量可能的原因是. A.蒸馏时从70℃开始收集产品 B.环己醇实际用量多了 C.制备粗品时环己醇随产品一起蒸出 3以下区分环己烯精品和粗品的方法合理的是. A.分别加入酸性高锰酸钾溶液 B.分别加入用金属钠 C.分别测定沸点.
甲醇乙二醇丙三醇中分别加入足量的金属钠产生等体积的氢气相同条件则上述三种醇的物质的量之比是
LakewayMiddleSchoolNowHasItsOwnSchoolStore! TheLion'sDen StopbytheLion'sDenbeforeorafterschoolorduringlunchtocheckoutthevariousgoodsavailableatournewschoolstore.Hereyoucanfindschoolsuppliesgymuniformsandgifts.Choir合唱团studentsmanagethestoreandarereadytoserveyou.Moneyraisedfromsaleswillhelppurchasenewmusiccostumesandsoundequipmentforthechoir. LocationRoom2258nexttothedininghall HoursMonday﹣Friday730﹣800A.M.1130A.M.﹣130P.M.and330﹣415P.M. EverythingyouneedforschoolisavailableattheLion'sDen.Comeintodaytoseeforyourself! UsedBookDonations Donationsofusedbooksarewelcomeandrewarded.Dropoffyourusedbookdonationsinthestore.ForeveryfivebooksdonatedreceiveaLionsRewardCoingoodfor25centsoffyournextpurchaseattheLion'sDen. SaveandWin Bringthefollowingcoupons优惠券inwhenyouvisittheLion'sDen.Youcansave20%offyourfirstpurchasereceiveafreepenorpencilandenteryournameandgradeinadrawingtowinaT﹣shirt.ScantheQRcodeandyoucangetmorediscountinformation. 56.TheLion'sDenraisesmoneyto. A.buybooks B.helpschoolchoir C.supportthepoor D.buildanewschool 57.Ifyoudonatefiveusedbooksyoucanget. A.aLionsRewardCoin B.20%off C.morediscountinformation D.afreepencilorpen 58.Yourpersonalinformationisneededto. A.getthemembership B.jointheschoolchoir C.winaT﹣shirt D.scantheQRcode 59.Wecanprobablyreadthispassagefrom. A.atextbook B.atravelguide C.asciencemagazine D.aschoolwebsite.
已知戊烷有3种同分异构体戊醇的同分异构体属醇类的数目有
DangersfromOuterSpaceWhatisthegreatestthreattolifeonourplanet?Isitclimatechange?Shortagesoffoodorwater?Ormightanaltogetherbiggerdangercomefromsomewherefurtherawayspace?We'renottalkingaboutanattackbylittlegreenmenhere.Insteadhowaboutbeinghitbyalargefallingstarbeatbydeadlyuniversalraysorfriedbytheenergyofaneruptingstar?Itwouldn'tbethefirsttimethatourEarthhashadaroughrideoverthelast3.7billionyearswithsomedisastrousevents.Themostfamousmassextinction灭绝was66millionyearsagowhenit'swidelybelievedthatameteorite陨石killedoffthedinosaurs.A110﹣mile﹣widecraterinMexicowiththesamegeologicalagesupportsthistheory.Believeitornotthiswasn'ttheworstcatastropheinourplanet'shistory.Thatwaswhen96%oflifewaswipedoutattheendofthePermianperiod252millionyearago.Scientistsdon'tknowforsurewhythishappenedbutanypotentialexplanationscarrywiththemthepossibilitythatsimilareventscouldhappenagain.SomeexpertsbelievethatourSunhasatwinstarwhichistoofarawaytoobservedirectly.ThishugesleepingstarcouldtwistthepathsoforbitingicyrocksandcastthemtowardstherestoftheSolarSystem.Isthiswhathappened252millionyearsago?OristhereinsteadperhapsadistantninthplantinourSolarSystemwhichpullsinpassingcomets彗星andsendsthemdashingourway?TheSunthathasgivenusthewarmthisgraduallyturningintoadeadlyenemy.Likeallstarsitisslowingdyingburningthroughitsenergysupplies.Asitdoessoitexpandsandinabout2billionyearsitwillhavegrownsomuchthattheheatwillmakelifeonplanetEarthunbearable.Whileallthissoundsalittlehorribletakecomfortfromthefactthatthechanceofbeinghitbyahugeinterstellarprojectile星际碰撞物isunbelievablyslimandthat2billionyearsisaverylongtime.32.Whendiddinosaursdieoutaccordingtothepassage?A.3.7billionyearsago.B.252millionyearsago.C.66millionyearsago.D.2billionyearsago.33Whywas96%oflifedestroyedattheendofthePermianperiod?A.Thecauseisstillunknown.B.Ahugefallingstarhittheearth.C.AtwinstarcasticyrockstowardstheSolarSystem.D.Aninthplanetpulledinpassingcomets.34.Whatcanwelearnfromthepassage?A.Allstarswilleventuallyrunofenergy.B.Ourplanetwillbeattackedbylittlegreenmen.C.Wewillbefriedbytheenergyofaneruptingstar.D.Ahugesleepingstarwillhittheearthinmillionsofyears.35.Whatistheauthor'sattitudetowardthedangersfromouterspace?A.Frightened.B.Relieved.C.Worried.D.Doubtful.
lg2+lg5==.
若关于x的不等式ax2-6x+a2<0的解集是1m则m等于.
●UndergroundCityMontrealCanada Takeoneofthe120entrancesintothelargestman﹣madeundergroundnetworkintheworld. Montreal'sUndergroundCitywasfirstbuiltin1962.About500000peopleadayuseits32kilometersofshoppingmallsapartmentbuildingshotelsbanksofficesmuseumsanduniversitiestherearealsotwotrainstationsandabusterminal终点站. ●MammothCaveNationalParkKentuckyAmerica PlacenamessuchasGrandAvenueandFrozenNiagaragiveanideaofwhat'sintheworld'slongestundergroundcavesystem.Theoldestpartwasformed10millionyearsago9.5millionyearsbeforemanmadeanappearance. ●Hannan'sNorthMineKalgoorlieAustralia Godown30.5metersinacageelevatortotunnelsdugduringAustralia's19th﹣centurygoldrush.Tryyourhandatpanningforgold淘金.Kalgoorliestillproduces10percentoftheworld'sgold. ●WieliczkaSaltMineKrakowPoland Itallstartedwhensaltwasjustliketoday'soil.Ninecenturiesofmininghasproducedmilesofundergroudpassagesandhugecavestoadepthof134meters.MorethanonemillionpeopleayearvisittheUNESCO﹣listedsitewhichincludeslakesandstatuesmadefromsalttheworld'slargestminingmuseumandconcerthalls. ●BerlinNuclearBunker地堡Germany Takeafewminutestoadjusttothedim昏暗的lightofthis1971radiation﹣proofColdWarbunker.Feelthecoldenteryourbonesinthedeathlysilence.Thenarrowbedsfor3562peopletakeupmostofthespace.Thebunkercouldoperatefor14daysafteranuclearattack.It'safrighteningexperience. 21.Whatdotheabovefiveattractionhaveincommon? A.Theyareallman﹣made.B.Theyalllieunderground. C.Theyareallradiation﹣proof.D.Theyalldatebacktothe19thcentury. 22.InWieliczkaSaltMinevisitorscan. A.makesaltstatuesB.enjoythemountainscenery C.learnaboutsaltmininghistoryD.experienceminingsaltthemselves 23.Wecaninferfromthepassagethat. A.Hannan'sNorthMineisoutofoperation B.BerlinNuclearBunkeriswell﹣equippednow C.MammothCaveNationalParkhastheworld'soldestcavesystem D.UndergroundCitywasbuilttomakecitizens'lifemoreconvenient 24.Wecanmostprobablyreadthepassageina. A.newsreportB.historymagazineC.travelguideD.researchpaper.
有机物分子中当某个碳原子连接着四个不同的原子或原子团时这种碳原子称为“手性碳原子”.例如如图有机物分子中带“*”碳原子就是手性碳原子.该有机物分别发生下列反应生成的有机物分子中仍含有手性碳原子的是
茉莉醛具有浓郁的茉莉花香其结构简式如下所示关于茉莉醛的下列叙述错误的是
根据实验操作与现象所得结论正确的是
已知函数fx=xex-x-ax2. Ⅰ若曲线y=fx在点1f1处的切线与直线y=-x+1平行求实数a的值 Ⅱ当x≥0时fx≥0.求实数a的取值范围.
有机物的一氯取代产物最多有
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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. LookingbacktotheNationalEnglishSpeakingCompetitionItakepartinseveraldaysagoIhavealottosharetoyou. FirstlyIfeelrealdelightedthatI'vewonthefirstprizeinthecompetitionwhichmakesmetounderstandthetruemeaningoftheproverbNopainsnogains.BesidesI'veestablishedthefriendshipwithstudentsfromalloverourcountryfromwhichI'velearnedalot.Moreimportantlyparticipateinthiscompetitionhasenabledmetoovercomemyfearofspeakinginpublicthusdevelopingmyself﹣confidence.AdditionallyIowemuchthankstomyteachersandjudges.WithouthishelpIcouldn'thavedonesuchexcellentjob. TosumupIwillalwaystreasurethismeaningfulandmemorableexperiences.
美国某中学举办英语暑假训练营开设以下课程cookingswimminggivingfirst﹣aidplayingfootball/basketball.假定你是李华请你写封申请信报名参加其中一门课程的学习.内容包括1.你感兴趣的一门课程2.为什么想学这门课程3.你期望从中学到什么.注意1.词数100左右2.可以适当增加细节以使行文连贯.DearSir/MadamYoursLiHua.
ThereareplentyofthingsyoucanfeelpositiveknowingaboutGarfield﹣thecatwholoveslasagnahatesMondaysandadoresateddybearnamedPooky.ButlastweekwithoutwarningthereroseastrangeandsuddendebatearoundaquestionaboutthefamouscatthatevencreatorJimDavisneededtoweighinonIsGarfieldaboyagirlornogender性别atall? TheargumentappearstohavebegunwhenwriterVirgilTexascameacrossa2014MentalFlossinterviewwithDaviswherehedescribedhistabbycreationGarfieldasnotreallymaleorfemaleoranyparticularraceornationalityyoungorold. Inresponsetothequote引用VirgilwroteonTwitterFACTGarfieldhasnogender.This.Is.Definite.SosurewasheofGarfield‘struegenderstatusthatVirgileventookituponhimselftoupdatetheGarfieldcharacterWikipediapagewiththeinformation. ButitwasquicklyclearthatnoteveryoneagreedwithVirgil‘seditsandthusbeganawarovertheWikipediaentryedits.SomementionedthatGarfieldismale.Otherswrotethatitshouldn'tmatteratallwhetherGarfieldismaleorfemale.WashingtonPostreportedthatthebattletookplaceover60hoursandeventuallyendedwhenWikipediashutthingsdownbylockingthepage. ItwasastatementthatsoonappearedtohavebeenmadeinhurryasJimDavisindeedsoonjoinedthedebateshuttingeverythingdowninonelinetoWashingtonPostGarfieldismale.The71﹣year﹣oldcartoonistalsopointedoutthatGarfieldhasagirlfriendArleneandclaimedthathis2014quoteshadbeentakenoutofcontext.I'vealwayssaidthatIwantedtoworkwithanimalsbecausethey'renotregardedasbeinganyparticulargenderraceageorethnicityhesaid.Inthatsensethehumorcouldbeenjoyedbyabroadergroup. 24.Whatdoesthepassagemainlydiscuss? A.AnargumentaboutthegenderofGarfield. B.TheinterviewbetweenJimDavisandVirgilTexas. C.AnupdateofWikipediaentryeditsaboutGarfield. D.ThepopularityofthefamouscartooncharacterGarfield. 25.Whatdoestheunderlinedphraseweighinonprobablymean? A.Agreewith. B.Joinin. C.Putforward. D.Careabout. 26.ThedebateonlineuponthegenderofGarfieldwasendedupby. A.writerVirgilTexas B.Wikipedia C.WashingtonPost D.creatorJimDavis 27.Whatcanbeinferredfromthelastparagraph? A.JimDavis'2014quoteshadbeencutout. B.Garfieldbecomesmorefamousthanbefore. C.WashingtonPostshuteverythingdowninonelineaboutGarfield. D.ThecreationofGarfieldisaimedatentertainmentratherthananythingelse.
WhenothersgetoffthetraintofinallygohomeLeonieMullerslaysbehind.That'sbecausesheisalreadyhomeThetrainisherapartmentandshesaysshelikesitthatway.TheGermancollegestudentgaveupherapartmentinspring.ItallstartedwithanargumentIhadwithmylandlordMullertoldTheWashingtonPostviae﹣mail.IimmediatelydecidedIwanttolivethereanymoreandthenIrealizedActuallyIdidn'twanttoliveanywhereanymore. Insteadsheboughtasubscription会员费thatallowshertoboardeverytraininthecountryforfree.NowMullerwashesherhairinthetrainbathroomandwriteshercollegepaperswhiletravelingataspeedofupto190mph.Shesaysthatsheenjoysthefreedomsinceshegaveupherapartment.Ireallyfeelathomeontrains.It'slikebeingonvacationallthetimeMullersaid. IwanttoinspirepeopletoquestiontheirhabitsandthethingstheyconsidertobenormalMullertoldThePost.Therearealwaysmoreopportunitiesthanonethinksthereare.Thenextadventureiswaitingjustaroundthecomer﹣providedthatyouwanttofindit. Mullerfrequentlytravelslateatnightalthoughshetriestosleepattheapartmentsofrelativesorfriends.Oftensheisaccommodatedbyherboyfriendhermotherorgrandmother.Normallywewouldhavetohavealong﹣distancerelationshipbutlivingonatrainenablesmetoseehimallthetimeMullertoldGermanTVstationSWRregardingherboyfriend.Mostofrayfriendsreallyliketheideaalthoughsomeconsiderittobequiteadventurous.Othershoweverhavereactedmorenegatively.TheyfeeloffendedbythefactthatIquestiontheordinarywayoflifeandliving. Theonlyproblem?Possessingaheadsetthatreducesmostsurroundingnoisesisimportantshesaid. 28.WhatdoweknowaboutthedirectreasonforMullerschoicetoliveontrains? A.Shehadanargumentwithherlandlord. B.Shewantedtovisitmorepeopleontheway. C.Shehadtofinishhergraduatepaperonthetopic. D.Sheplannedtoactagainsttradition. 29.AccordingtoMullerwhichisoneoftheadvantagesoflivingontrains? A.Shecanhavemoreholidays. B.Shecanescapefromcollegelife. C.Shecanpossessaheadset. D.Shecanseeherboyfriendmoreoften. 30.WhatdoesMullerwanttoexpressinParagraph3? A.Thereareopportunitieseverywhereinlife. B.Thenextadventureiscomingsoon. C.Peopleneedtomakechangesintheirlife. D.Peopleneedtofollowinherfootstepstoliveontrains. 31.WhatdoestheunderlinedworditinParagraph4referto? A.Theordinarywayoflifeandliving. B.Thethoughtoflivingonatrain. C.GermanTVstationSWR. D.Along﹣distancerelationship.
有各不相同的5红球3黄球2白球事件A从红球和黄球中各选1球事件B从所有球中选取2球则事件A发生是事件B发生的
Nowadaysmoreandpeoplehavechancestotravelstudyworkorevenliveabroad.Itisnecessaryforyoutokeepinmindthesegeneral61ruleforpolitebehavior. Ifyou62invitetoanAmericanfriend'shomefordinnerfirstofallarriveapproximatelyontimebutnotearly.Americansexpectpromptness准时. Whenyou'reinvitedtosomeone'shomeforameal63ispolitetobringasmallgift.Flowersorcandiesarealwaysappropriate.Ifyouhaveanattractiveitem64makeinyournativecountryyourhostorhostesswouldcertainlyenjoyreceivingthatasagift. Wearingproperclothesandabeautifulsmileissimplynotenough.Tablemannersarealsoofgreat65important.Donotopenyourmouthtotalk66youhaveswallowedyourfood.Alsochewfoodwithyourmouth67close.Whenyouwanttogetthefoodthatisatadistancedonotstretchyourhandstoreach68it.Insteadaskforthefoodtobepassedtoyou. Don'tleave69immediateafterdinnerbutdon'toverstayyourwelcomeeither.Whenyourfriendsseemtobegettingtiredandrunningoutofconversationtaketheirbehaviorasasignaltoleave.Thenextdaycallorwrite70thank﹣younotetosayhowmuchyouenjoyedtheevening.
有机物有多种同分异构体其中属于酯类且氯原子直接连在苯环上的同分异构体有多少种不考虑立体异构
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