首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
如图所示，甲为一列简谐波在t＝2.0s时刻波的图象，Q为x＝4m的质点，乙为甲图中P质点的振动图象，下列说法正确的是（ ） A．此波沿x轴负方向传播 B．t＝2.0s时，Q点位移为cm ...
查看本题答案
包含此试题的试卷
高三下学期物理《》真题及答案
点击查看
你可能感兴趣的试题
如图所示图中的实线为一列简谐波在t时刻的图像虚线为这列波在t+0.21s时刻的图像则以下说法正确的是
波一定向右传播
若波向左传播，波速一定为5m/s
若周期为0.84s，波速一定向右传播
若周期小于0.84s，波也可能向左传播
如图7甲所示为一列简谐波在t=20s时的波形图乙图是这列波中P点的振动图线那么该波的传播速度和传播方
v=25cm/s 向左传播
v=50cm/s 向左传播
v=25cm/s 向右传播
v=50cm/s 向右传播
⑵如图所示一列简谐波沿x轴传播实线为t=0时的波形图此时P.质点向y轴负方向运动虚线为经过0.02s
如图所示是一列简谐波在t=0时刻的波动图象已知这列波是沿x轴正方向传播波速为20m/s则下列说法正确
质点P.做简谐运动的振幅是8cm
在t=0.126s时刻，质点P.的速度方向沿y轴正方向
在t=0.15s时刻，质点P.的速度正在减小
在t=0.15s时刻，质点P.的加速度正在减小
如图所示实线是一列简谐波在某时刻的波形图虚线是0.2s后它的波形图求该波的波速
如图所示是一列简谐波在t＝0时刻的波形简谐波沿x轴的正向传播已知t＝2.2s时P.质点恰好第三次在波
已知一列简谐波在x轴上传播波的振动周期为0.4s且t=0时刻的波形图如图所示图中M.处的质点此时正经
如图甲为一列沿x轴传播的简谐波在t=0.1s时刻的波形图乙表示该波传播的介质中x=2m处的质点a从t
波传播的速度为20m/s
波沿x轴正方向传播
t=0.25s，质点a的位移沿y轴负方向
t=0.25s，x=4m处的质点b的加速度沿y轴负方向
两列简谐横波均沿x轴传播t=0时刻的波形图如图所示其中一列沿正x方向传播图中实线所示一列沿负x方向传
两列简谐波的频率均为1.25Hz
两列简谐波引起x=0处质点振动的振幅为零
两列简谐波引起x=2m处质点振动的振幅为零
在t=0.2s两列简谐波引起x=4m处质点振动的位移为12cm
两列简谐波引起x=1m处质点振动的位移可能为12cm
如图甲所示为一简谐波在t=0时刻的图象图乙所示为x=4m处的质点P.的振动图象则下列判断正确的是
这列波的波速是2m/s
这列波的传播方向沿x正方向
t=3.5s时P.点的位移为0.2m
从t=0时刻开始P.点的振动方程为
m
如图所示图中的实线为一列简谐波在t时刻的图像虚线为这列波在t+0.21s时刻的图像则以下说法正确的是
波一定向右传播
若波向左传播，波速一定为5m/s
若周期为0.84s，波速一定向右传播
若周期小于0.84s，波也可能向左传播
一列简谐横波在t=0.8s时的图象如图甲所示其x=0处质点的振动图象如图乙所示由图象可知简谐波沿x轴
一列在x轴上传播的简谐波在x1＝10cm和x2＝110cm处的两个质点的振动图象如图所示则波源的振动
如下图所示实线是一列简谐波在某一时刻的波形图象虚线是0.2s后它的波形图象则这列波可能的波速为多大
一列简谐波在t=0.8s时的图象如图甲所示其x=0处质点的振动图象如图乙所示由图象可知简谐波沿x轴▲
一列横波在x轴线上传播着t1=0时刻的波形图象如图中的Ⅰ所示t2=0.04s时的波形图象如图中Ⅱ所示
一列沿x轴正方向传播的简谐波t=0时刻的波形如图所示t=0.2s时C.点开始振动则
t=0.3s时，波向前传播了3m，质点
将到达质点
的位置 B.t=0.05s时，质点A.的速度方向向下 C.0～0.6s内，质点B.的平均速度为2m/s
若同时存在一列振幅为10cm、频率为2.5Hz的沿x轴负方向传播的简谐波，则两列波相遇叠加的区域会出现干涉现象
如图10所示甲为某一简谐波在t=1.0s时刻的图象乙为甲图中C.点的振动图像则下列说法正确的是
甲图中
点的运动方向向左 B.波速v=6m/s
要使该波能够发生明显的衍射，则要求障碍物的尺寸远大于4m
该波与另一列波发生稳定的干涉，则另一列波的频率为1Hz
如图所示是一列简谐波在t＝0时刻的波形简谐波沿x轴的正向传播已知t＝2.2s时P.质点恰好第三次在波
如图甲所示为一简谐波在t=0时刻的图象图乙所示为x=4m处的质点P.的振动图象则下列判断正确的是
这列波的波速是2m/s
这列波的传播方向沿x正方向
t=3.5s时P.点的位移为0.2m
从t=0时刻开始P.点的振动方程为
mE. 从t=0时刻开始P.点的振动方程为
m
热门试题
更多
机动车驾驶的考核过程中科目三又称道路安全驾驶考试是机动车驾驶人考试中道路驾驶技能和安全文明驾驶常识考试科目的简称假设某人每次通过科目三的概率均为且每次考试相互独立则至多考两次就通过科目三的概率为．
在△ABC中若|+|＝|﹣|AB＝2AC＝1EF为BC边的三等分点则•＝
有学生用五氧化二磷作为乙醇脱水制乙烯的催化剂进行相关实验．按如表所示的量和反应条件在三颈瓶中加入一定量P2O5再注入95%的乙醇并加热观察现象． 实验结果如下 根据上述材料完成下列填空． 写出实验室用乙醇制乙烯的化学方程式． 2如图装置中冷凝管的作用是 3实验1使溴的四氯化碳溶液褪色的物质是写结构简式 4根据实验12可以推断 ①以P2O5作为催化剂获得乙烯的反应条件是 ②P2O5与95%乙醇在水浴70℃加热条件下三颈瓶收集瓶中的液体经检验为磷酸三乙酯可以发生的有机反应的类型是反应．
Hundredsofpeoplehaveformedimpressionsofyouthroughthatlittledevice装置onyourdesk.Andthey'veneveractually41you.Everythingtheyknowaboutyou42throughthisdevicesometimesfromhundredsofmilesaway.43heyfeeltheycanknowyou44fromthesoundofyourvoice.That'showpowerfulthe45is.Powerfulyesbutnotalways46.ForyearsIdealtwithmytravelagentonlybyphone.RanimyfacelessagentwhomI'dnevermet47gotmerock﹣bottompricesonairfarescarsandhotels.Buthercoldvoicereally48me.Isometimeswishedto49anotheragent.OnemorningIhadto50animmediateflighthomeforafamilyemergency.IranintoRani'soffice51.Thewomansittingatthedesk52mymadnesssympatheticallyjumpedup.Shegavemea53smilenoddedwhilelisteningpatientlyandthenprintedoutthe54immediately.'Whatawonderfullady!'Ithought.Rushingout55Icalledoutovermyshoulder'Bythewaywhat'syourname?''I'mRani'shesaid.Iturnedaroundandsawa56womanwithabigsmileonherfacewavingtowishmeasafetrip.Iwas57!WhyhadIthoughtshewascold?Raniwaswellso58.SittingbackinthecaronthewaytotheairportIfigureditallout.Rani's59﹣﹣﹣herwarmsmilehernodsher‘I'mhereforyou'60﹣﹣﹣wereallsilentsignalsthatdidn'ttravelthroughwires.41.A.accepted B.noticed C.heard D.met42.A.came B.moved C.ran D.developed43.A.Thus B.Yet C.Then D.Indeed44.A.rather B.also C.just D.already45.A.Telephone B.voice C.connection D.impression46.A.direct B.useful C.easy D.accurate47.A.inperson B.bymyself C.inpublic D.onpurpose48.A.annoyed B.interested C.discouraged D.confused49.A.promote B.train C.find D.know50.A.arrange B.postpone C.confirm D.book51.A.forthefirsttime B.atanytime C.fromtimetotime D.ingoodtime52.A.expecting B.seeing C.testing D.avoiding53.A.shy B.comforting C.familiar D.forced54.A.bill B.form C.ticket D.list55.A.hopefully B.disappointedly C.gratefully D.regretfully56.A.careful B.serious C.nervous D.pleasant57.A.amused B.worried C.helpless D.speechless58.A.calm B.nice C.proud D.clever59.A.forgiveness B.eagerness C.friendliness D.skillfulness60.A.explanation B.attitude C.concept D.Behavior
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Λ并在其下面写出该加的词. 删除把多余的词用斜线﹨划掉. 删除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. Thesummerholidayiscoming.MyclassmatesandIaretalkingabouthowtododuringtheholiday.Wecanchosebetweenstayingathomeandtakeatrip.Ifwestayathomeitiscomfortablebutthereisnoneedtospendmoney.Butinthatcasewewilllearnlittleaboutworld.Ifwegoonatripabroadwecanbroadenyouviewandgainknowledgeswecannotgetfrombooks.Someclassmatessuggestwecangotoplacesofinterestnearby.Ithoughtthatitisagoodidea.Itdoesnotcostmanyyetwecanstilllearnalot.
某研究性学习小组设计了一组实验验证元素周期律． 1甲同学在abcd四只烧杯里分别加入50mL冷水再分别滴加几滴酚酞溶液依次加入大小相近的钠Na镁Mg铝Al钾K金属块观察现象． ①甲同学设计实验的目的是验证同一主族从上到下元素的元素金属性逐渐增强同一周期从左到右元素金属性 ②反应最剧烈的烧杯里金属是填字母 A钠B镁C铝D钾 ③写出a烧杯里发生反应的离子方程式． ④实验中发现bc两只烧杯中几乎没有什么现象要想达到实验的目的请你帮助选择下列合适的方法． A．把镁铝的金属块换成金属粉末 B．把烧杯中的冷水换成热水 C．把烧杯中的冷水换成盐酸 D．把烧杯中的冷水换成氢氧化钠溶液 2乙同学设计实验验证非金属元素的非金属性越强其最高价含氧酸的酸性就越强．他设计了如图装置以验证碳氮硅元素的非金属性强弱．乙同学设计的实验可直接证明三种酸的酸性强弱已知A是强酸其浓溶液在常温下可与铜反应B是块状固体烧杯中盛放C的水溶液打开分液漏斗的活塞后C中可观察到白色胶状沉淀生成． ①写出所选用物质的化学式AC． ②写出烧瓶中发生反应的化学方程式． ③碳氮硅三种元素的非金属性由强到弱顺序为．
已知函数fx＝lnxφx＝mx． 1若两函数图象有两个不同的公共点求实数m的取值范围 2若求实数n的最大值．
已知两个数列{an}{bn}的前n项和分别为SnTn其中{an}是等比数列且． 1求{bn}的通项公式 2求{3n•bn}的前n项和．
What'sOn?ElectricUnderground7.30pm﹣1.00amFreeattheCyclopsTheatreDoyouknowwho'splayinginyourarea?We'rebringingyouaneveningofliverockandpopmusicfromthebestlocalbands.Areyouinterestedinbecomingamusicianandgettingarecordingcontract合同?Ifsocomeearlytothetalkat7.30pmbyJulesSkyeasuccessfulrecordproducer.He'sgoingtotalkabouthowyoucanfindtherightpersontoproduceyoumusic.GeeWhizz8.30pm﹣10.30pmComedyatKaleidoscopeComeandseeGeeWhizzperform.He'sthefunnieststand﹣upcomedianonthecomedyscene.Thisjoyfulshowwillpleaseeveryonefromtheyoungesttotheoldest.GeeWhizzreallyknowshowtomakeyoulaugh!Ourbarisopenfrom7.00pmfordrinksandsnacks快餐.Simon'sWorkshop5.00pm﹣7.30pmWednesdaysatVictoriaStageThisisagoodchanceforanyonewhowantstolearnhowtodocomedy.Theworkshoplooksateverykindofcomedyandpracticesmanydifferentwaysofmakingpeoplelaugh.Simonisacomedianandactorwhohas10years'experienceofteachingcomedy.Hisworkshopsareexcitingandfun.AneveningwithSimonwillgiveyoutheconfidencetobefunny.CharlotteStone8.00pm﹣11.00pmPizzaWorldFinefoodwithbeautifuljazzmusicthisisagreateveningout.CharlotteStonewillperformsongsfromhernewbest﹣sellingCDwithJamesPickeringonthepiano.ThemenuisItalianwithexcellentmeatandfreshfishpizzasandpasta面食.Bookearlytogetatable.Ourbarisopenalldayandservescocktailscoffeebeerandwhitewine.21.Whocanhelpyouifyouwanttohaveyourmusicproduced?A.JulesSkye.B.GeeWhizz.C.CharlotteStone.D.JamesPickering.22.Atwhichplacecanpeopleofdifferentagesenjoyagoodlaugh?A.TheCyclopsTheatreB.KaleidoscopeC.VictoriaStageD.PizzaWorld23.WhatdoweknowaboutSimon'sWorkshop?A.Itrequiresmembershipstatus.B.Itlaststhreehourseachtime.C.Itisrunbyacomedyclub.D.ItisheldeveryWednesday.24.WhenwillCharlotteStoneperformhersongs?A.5.00pm﹣7.30pm.B.7.30pm﹣1.00am.C.8.00pm﹣11.00pm.D.8.30pm﹣10.30pm.
如图在四棱锥P﹣ABCD中PA⊥底面ABCD且AB⊥BCAD∥BCPA＝AB＝BC＝2ADE是PC的中点． 1求证DE⊥平面PBC 2求二面角A﹣PD﹣E的余弦值．
若z＝则复数＝
AnewcollectionofphotosbringsanunsuccessfulAntarcticvoyagebacktolife.FrankHurley'spictureswouldbeoutstanding﹣﹣﹣﹣undoubtedlyfirst﹣ratephoto﹣journalism﹣﹣﹣iftheyhadbeenmadelastweek.Infacttheywereshotfrom1914through1916mostofthemafteradisastrousshipwreck海难byacameramanwhohadnoreasonableexpectationofsurvival.Manyoftheimageswerestoredinanicechestunderfreezingwaterinthedamagedwoodenship.TheshipwastheEnduranceasmalltightNorwegian﹣builtthree﹣masterthatwasintendedtotakeSirErnestShackletonandasmallcrewofseamenandscientists27meninalltothesouthernmostshoreofAntarctica'sWeddellSea.FromthatpointShackletonwantedtoforceapassagebydogsled雪橇acrossthecontinent.ThejourneywasintendedtoachievemorethanwhatCaptainRobertFalconScotthaddone.CaptainScotthadreachedtheSouthPoleearlyin1912buthaddiedwithhisfourcompanionsonthemarchback.AswriterCarolineAlexandermakesclearinherforcefulandwell﹣researchedstoryTheEnduranceadventuringwaseventhenathoroughlycommercialeffort.Scott'slastjourneycompletedasbelayinatentdyingofcoldandhungercaughttheworld'simaginationandafilmmadeinhishonordrewcrowds.ShackletonaonetimeBritishmerchant﹣navyofficerwhohadgottowithin100milesoftheSouthPolein1908startedabusinessbeforehis1914voyagetomakemoneyfrommovieandstillphotography.FrankHurleyaconfidentandgiftedAustralianphotographerwhoknewtheAntarcticwashiredtomaketheimagesmostofwhichhaveneverbeforebeenpublished.33.WhatdoweknowaboutthephotostakenbyHurley?A.TheyweremadelastweekB.TheyshowedunderseasceneriesC.TheywerefoundbyacameramanD.Theyrecordedadisastrousadventure34.WhoreachedtheSouthPolefirstaccordingtothetext?A.FrankHurleyB.ErnestShackletonC.RobertFalconScottD.CarolineAlexander35.WhatdoesAlexanderthinkwasthepurposeofthe1914voyage?A.ArtisticcreationB.ScientificresearchC.MoneymakingD.Treasurehunting.
下列有关环境污染的说法不正确的是
在直三棱柱ABC﹣A1B1C1中底面为等腰直角三角形AB＝BC＝2AA1＝1若EFD别是棱ABCBA1C1的中点则下列四个命题①B1E⊥FD ②三棱锥A﹣BCC1的外接球的表面积为9π ③三棱锥B1﹣DEF的体积为 ④直线C1E与平面ABC所成角为． 其中正确的命题有．把所有正确命题的序号填在答题卡上
25分阅读下面短文然后按照要求写一篇150词左右的英语短文. 【写作内容】 1.以约30个词概括以上短文的主要内容. 2.以约120个词发表你的观点内容包括 1具体分析导致忽视汉语学习的原因2从政府和学校来谈谈该如何做来改变这一现象. 【写作要求】 1.作文中不得直接引用原文中的句子2.作文中不能出现真实姓名和学校名称. 【评分标准】概括准确语言规范内容合适篇章连贯.
6分Mymomonlyhadoneeye.Ihatedhershewassuchanembarrassment.Mymomranasmallshopatafleamarket.Shecollectedlittleweedsandsuchtosellanythingforthemoneyweneeded.Therewasthisonedayduringelementaryschool.Irememberthatitwasfielddayandmymomcame.Iwassoembarrassed.Howcouldshedothistome?Ithrewherahatefullookandranout.IwishedthatmymomwouldjustdisappearfromthisworldsoIsaidtomymom'Momwhydon'tyouhavetheothereye?!You'reonlygoingtomakemealaughingstock.Whydon'tyoujustdie?'Mymomdidnotrespond.ThatnightIwokeupandwenttothekitchentogetaglassofwater.Mymomwascryingtheresoquietlyasifshewasafraidthatshemightwakeme.Itookalookatherandthenturnedaway.BecauseofthethingIhadsaidtoherearliertherewassomethingpinchingatmeinthecornerofmyheart.EvensoIhatedmymotherwhowascryingoutofheroneeye.SoItoldmyselfthatIwouldgrowupandbecomesuccessfulbecauseIhatedmyone﹣eyedmomandourdesperatepoverty.ThenIstudiedreallyhard.IleftmymotherandcametoSeoulandstudiedandgotacceptedintheSeoulUniversitywithalltheconfidenceIhad.ThenIgotmarried.I'mlivinghappilyasasuccessfulman.Ilikeitherebecauseit'saplacethatdoesn'tremindmeofmymom.Thishappinesswasgettingbiggerandbiggerwhensomeoneunexpectedcametoseeme'What?!Who'sthis?!'ItwasmymotherStillwithheroneeye.Itfeltasifthewholeskywasfallingapartonme.Mylittlegirlranawayscaredofmymom'seye.AndIaskedher'Whoareyou?Idon'tknowyou!!'asifItriedtomakethatreal.Iscreamedather'Howdareyoucometomyhouseandscaremydaughter!Getoutofherenow!!'Andtothismymotherquietlyanswered'ohI'msosorry.Imayhavegottenthewrongaddress'andshedisappeared.Thankgoodnessshedoesn'trecognizeme.Iwasquiterelieved.ItoldmyselfthatIwasn'tgoingtocareorthinkaboutthisfortherestofmylife.Onedayaletterregardingaschoolreunioncametomyhouse.IliedtomywifesayingthatIwasgoingonabusinesstrip.AfterthereunionIwentdowntotheoldshackthatIusedtocallahousejustoutofcuriositythereIfoundmymotherfallenonthecoldground.ButIdidnotshedasingletear.Shehadapieceofpaperinherhand.itwasalettertome.ShewroteMysonIthinkmylifehasbeenlongenoughnow.AndIwon'tvisitSeoulanymorebutwoulditbetoomuchtoaskifIwantedyoutocomevisitmeonceinawhile?Imissyousomuch.AndIwassogladwhenIheardyouwerecomingforthereunion.ButIdecidednottogototheschool.ForyouI'msorrythatIonlyhaveoneeyeandIwasanembarrassmentforyou.Youseewhenyouwereverylittleyougotintoanaccidentandlostyoureye.AsamotherIcouldn'tstandwatchingyouhavingtogrowupwithonlyoneeyesoIgaveyoumineIwassoproudofmysonthatwasseeingawholenewworldformeinmyplacewiththateye.Thecoupletimesthatyouwereangrywithme.Ithoughttomyself‘it'sbecausehelovesme.'Iloveyou.Youmeantheworldtome.MyWorldShattered.Ihatedthepersonwhoonlylivedforme.IcriedforMyMotherIdidn'tknowofanywaythatwillmakeupformyworstdeeds1Thewriterthoughthismotherwassuchanembarrassmentbecause?A.hismotheronlyhadoneeyeB.hismotherranasmallshopatafleamarketC.hismotherwenttohisschoolD.hismotherwasdesperatelypoor2WhichofthefollowingisNOTtrueaccordingtothepassage?A.Thewriter'smothergavehimoneofhereyes.B.Thewritergotmarriedafterhehadfinishedschoolinanothercity.C.Thewriter'sclassmatelaughedathimbecauseofhismother.D.Thewriter'smothergotawrongaddressandcouldn'tfindherson3Whichoneisthebesttitle?A.Anembarrassmentorapride?B.AletterfrommymotherC.CharmoftheloveD.Theroadtogrowth
若变量xy满足约束条件则x+2y的最大值是
九章算术是我国古代的数学名著体现了古代劳动人民的数学智慧其中第六章“均输”中有一竹节容量问题某教师根据这一问题的思想设计了如图所示的程序框图若输出m的值为67则输入a的值为
FiveyearsagowhenItaughtartataschoolinSeattleIusedTinkertoysasatestatthebeginningofatermtofindoutsomethingaboutmystudents.IputasmallsetofTinkertoysinfrontofeachstudentandsaid'MakesomethingoutoftheTinkertoys.Youhave45minutestoday﹣and45minuteseachdayfortherestoftheweek.'Afewstudentshesitatedtostart.Theywaitedtoseetherestoftheclasswoulddo.Severalotherscheckedtheinstructionsandmadesomethingaccordingtooneofthemodelplansprovided.Anothergroupbuiltsomethingoutoftheirownimaginations.OnceIhadaboywhoworkedexperimentallywithTinkertoysinhisfreetime.Hisconstructionsfilledashelfintheartclassroomandagoodpartofhisbedroomathome.Iwasdelightedatthepresenceofsuchastudent.Herewasanexceptionallycreativemindatwork.HispresencemeantthatIhadanunexpectedteachingassistantinclasswhosecreativitywouldinfect感染otherstudents.Encouragingthiskindofthinkinghasadownside.Irantheriskoflosingthosestudentswhohadadifferentstyleofthinking.Withoutfailonewoulddeclare'ButI'mjustnotcreative.''Doyoudreamatnightwhenyou'reasleep?''Ohsure.''Sotellmeoneofyourmostinterestingdreams.'Thestudentwouldtellsomethingwildlyimaginative.Flyingintheskyorinatimemachineorgrowingthreeheads.'That'sprettycreative.Whodoesthatforyou?''Nobody.Idoit.''Really﹣atnightwhenyou'reasleep?''Sure.''Trydoingitinthedaytimeinclassokay?'25.TheteacherusedTinkertoysinclassinorderto?A.knowmoreaboutthestudentsB.makethelessonsmoreexcitingC.raisethestudents'interestinartD.teachthestudentsabouttoydesign26.WhatdoweknowabouttheboymentionedinParagraph3?A.Helikedtohelphisteacher.B.Hepreferredtostudyalone.C.Hewasactiveinclass.D.Hewasimaginative.27.Whatdoestheunderlinedword'downside'inParagraph4probablymean?A.Mistake.B.Drawback.C.Difficulty.D.Burden.28.Whydidtheteacheraskthestudentstotalkabouttheirdreams?A.Tohelpthemtoseetheircreativity.B.Tofindoutabouttheirsleepinghabits.C.Tohelpthemtoimprovetheirmemory.D.Tofindoutabouttheirwaysofthinking.
已知两点A10Bb0若抛物线y2＝4x上存在点C使△ABC为等边三角形则b的值为
铜～锌原电池如图所示电解质溶液为稀硫酸下列说法不正确的是
根据金属活动顺序表Cu不能发生如下反应Cu+2H2O＝CuOH2↓+H2↑．但选择恰当电极材料和电解液进行电解这个反应就能变为现实．下列四种电极材料和电解液中能实现该反应最为恰当的是
Readingcanbeasocialactivity.Thinkofthepeoplewhobelongtobookgroups.Theychoosebookstoreadandthenmeettodiscussthem.NowthewebsiteBookCrossing.comBookCrossing.comturnsthepageonthetraditionalideaofabookgroup.Membersgoonthesiteandregisterthebookstheyownandwouldliketoshare.BookCrossingprovidesanidentificationnumbertostickinsidethebook.Thenthepersonleavesitinapublicplacehopingthatthebookwillhaveanadventuretravelingfarandwidewitheachnewreaderwhofindsit.BrucePedersonthemanagingdirectorofBookCrossingsays'Thetwothingsthatchangeyourlifearethepeopleyoumeetandbooksyouread.BookCrossingcombinesboth.'Membersleavebooksonparkbenchesandbusesintrainstationsandcoffeeshops.Whoeverfindstheirbookwillgotothesiteandrecordwheretheyfoundit.Peoplewhofindabookcanalsoleaveajournalentrydescribingwhattheythoughtofit.E﹣mailsarethensenttotheBookCrossingtokeepthemupdatedaboutwheretheirbookshavebeenfound.Brucepetersonsaystheideaisforpeoplenottobeselfishbykeepingabooktogatherdustonashelfathome.BookCrossingispartofatrendamongpeoplewhowanttogetbacktothe'real'andnotthevirtual虚拟.Thesitenowhasmorethanonemillionmembersinmorethanonehundredthirty﹣fivecountries.29.Whydoestheauthormentionbookgroupsinthefirstparagraph?A.Toexplainwhattheyare.B.TointroduceBookCrossing.C.Tostresstheimportanceofreading.D.Toencouragereaderstosharetheirideas.30.Whatdoestheunderlinedword'it'inParagraph2referto?A.Thebook.B.Anadventure.C.Apublicplace.D.Theidentificationnumber.31.WhatwillaBookCrosserdowithabookafterreadingit?A.Meetotherreaderstodiscussit.B.Keepitsafeinhisbookcase.C.Passitontoanotherreader.D.Mailitbacktoitsowner.32.Whatisthebesttitleforthetext?A.OnlineReadingAVirtualTourB.ElectronicBooksAnewTrendC.ABookGroupBringsTraditionBackD.AWebsiteLinksPeoplethroughBooks.
已知NH3和HCl都是能用来做喷泉实验的气体．若在同温同压下用等体积烧瓶一个收集满NH3另一个收集HCl和N2的混合气体如图所示．喷泉实验停止后两个烧瓶内溶液的关系是不考虑烧瓶内溶质的扩散氨水的溶质按NH3计算
Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable.Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished.Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy.Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout.
6分AfewthingstoconsiderbeforebookingaflightWithfuelcostsrisingandairlinesfindingmorefeestoimposeontravelerseverydayairfareisn'tgettinganycheaper.Sinceyoucan'tdrivetoallyourdreamdestinationsflyingistheonlywaytogosometimesandundeniablythefastest.Luckilythereareplentyofwaystofindthemostaffordablefaresandalsoavoidpayingasmanyextrachargesaspossiblewhenyouplanahead.GettingthebestfareAirlinesputouttheirfaresalesonTuesdaymorningmakingthisdaythebestdaytobookaflightforless.Flyduringtheleastpopulartimes.TuesdayWednesdayandSaturdayaretheslowestdaystoflywhichmeanscheaperdealsthantherestoftheweek.Youcanalsofindreducedratesonearlymorningflightssincemanypeopledon'tliketogetupbeforethesuntogettotheairport.Earlierboardingtimescanalsoconsiderablycutdownyourchancesofgettingbumpedonanoverbookedflightordelayedbecauseofotherdelayedflightsormechanicalissues.Chooseyourseatlater.Someairlineschargeyoutopickyourseatwhenyoubookonlineaddingevenmoretothebottomlineofyourticketcost.Ifyoushowupearlyonyourtraveldayyoucanstillgetsuitableseats.Someofthebestseatsgetheldbackuntilflightdayunlessothersarewillingtopayextraforthemaheadoftimesoyoustillhavethechanceatoneofthose.Flyonholidays.Youalreadyknowthatsummeristhemostexpensivetimetoflyandeventhoughmostothertimesaremoreaffordablethedayssurroundingholidayscanbecrazy.Savebigifyou'rewillingtotravelonmajorholidayssuchasThanksgivingandChristmas.Don'twaituntilthelast﹣minutetobook.Manytravelersdon'tknowthatthere'sasweetspotforbookingandgettingthebestpriceonyourtickets.Booktooearlyortoolateandyoucouldenduppayingmorethanyouneedto.Thebesttimetobookisbetweenthreemonthsandsixweeksfromwhenyouwanttotravel.AvoidingextrafeesAirlineswillchargeforjustaboutanythingthesedays.Somehaveeventoyedaroundwithchargingcustomersforusingtherestroom.Allthoseextrafeescancertainlyaddupbutthere'snoreasontopaythemifyoudon'thaveto.Herearesometipstokeepmoneyinyourwalletonceyougettotheairport.Avoidtheupgradeit'snotnecessary.Sometimesupgradesarefreebutmostlyyouwillbechargedforseekingalast﹣minutebumptofirstclassandthecostcanbehefty.Flycarry﹣ononly.Baggagefeesvarywildlybutalmostallairlineschargethemandchargebig.Whypayforyourclothestoflywithyou?Ifeveryoneinyourtravelpartychecksabagyourbillcanbeastronomicalbeforeyoueverevengettoyourdestination.It'seasytoreducetheamountofstuffyoupackMakesureallyourclothingcoordinatessoyoucantakelessandstillmakemoreoutfitcombinationstakeonlytwopairofshoesplantodoabitoflaundryonyourtripandbringonlytravel﹣sizedtoiletries.Packyourownsnacks.Unlessyou'reflyinginternationallyit'srareyourflightcomeswithafreemeal.Snacksontheplanearenotcheapandalmostneverhealthy.Don'trelyonwhat'sonthesmallmenuandinsteadtucksomeofyourownsnacks﹣granolabarshomemademuffinsfruitandtrailmixallmakefantastictravelfoods﹣intoyourbagandeatalotbetterandcheaperthanotherpassengers.Doyouhaveatriedandtruemethodofgettingthebestdealonyourflights?Letusknow.1TosavemoneywhichoneshouldNOTbethechoice?A.EarlymorningflightsB.EarlyboardingtimesC.TheflightsonSaturdayD.TheflightsonSummerholiday2Accordingtothepassagewhichoneisright?A.Ifyoushowupearlyonyourtraveldayyoucangetthebestseats.B.Youcansavebigifyou'rewillingtotravelonChristmaseve.C.Youwillbechargedforseekingtheupgradesandthecostcanbehigh.D.Ifyou'reflyinginternationallyyourflightwillcomewithafreemeal.3Accordingtothepassageyoucandothethingsexcepttoavoidextrafees.A.Usetherestroom.B.TuckyourownsnacksC.Flywithcarry﹣ononly.D.Avoidtheupgrade.
在一次连环交通事故中只有一个人需要负主要责任但在警察询问时甲说“主要责任在乙”乙说“丙应负主要责任”丙说“甲说的对”丁说“反正我没有责任”四人中只有一个人说的是真话则该事故中需要负主要责任的人是
20分FewAmericansstayinoneplaceforalifetime.We1fromthecitytothesuburbsfromhighschooltocollegeinadifferentstatefromajobinoneregiontoabetterjob2fromthehomewherewe3ourchildrentothehomewhereweplantolivein4.Witheachmoveweare5makingnewfriendswhobecomepartofournewlife.Formanyofusthe6isaspecialtimeforformingnewfriendships.TodaymillionsofAmericansgoonvocation7andtheygonotonlytoseenewsightsbutalso﹣inthoseplaceswheretheydonotfeeltoo8﹣withthehopeofmeetingnewpeople.Noonereally9avacationtriptoproduceaclosefriendbutthebeginningofafriendshipispossible.Surelyineverycountrypeople10friendship?Theword'friend'toAmericanpeoplecanbe11toawiderangeofrelationships﹣tosomeoneonehasknownforafewweeksinanewplacetoaclosebusinesscompaniontoachildhoodplaymatetoamanorwomantoa12colleague.Therearereal13amongtheserelationsforAmericans﹣afriendshipmaybe14casualsituationalordeepandlasting.ButtoaEuropeanwhoseesonlyoursurfacebehaviorthedifferencesarenotclear.AsEuropeansseeitallkindsof'friends'flow15ofAmericans'homeswithlittleceremony.Theymaybeparentsofthechildren'sfriendshouseguestsofneighborsmembersofacommitteebusinessassociatesfromanothertownorevenanothercountry.16asaguestintoanAmericanhometheEuropeanvisitorfindsno17differences.Theatmosphereis18.Mostpeopleoldandyoungarecalled19firstnames.Americans'characteristicopennesstodifferentstylesofrelationshipmakesitpossibleforustofindnewfriendsabroadwithwhomwefeel20.1A.drive B.commute C.move D.settle2A.abroad B.elsewhere C.somewhere D.nowhere3A.deliver B.protect C.educate D.raise4A.retirement B.death C.illness D.sadness5A.mostly B.mainly C.rarely D.forever6A.winter. B.summer C.spring D.autumn7A.along B.freely C.together D.abroad8A.alone B.strange C.scared D.remote9A.allows B.desires C.expects D.imagines10A.form B.develop C.ignore D.value11A.used B.applied C.stuck D.dedicated12A.kind B.generous C.trusted D.helpful13A.differences B.varieties C.distinctions D.diversities14A.informal B.reliable C.shallow D.fragile15A.inandout B.onandon C.byandby D.upanddown16A.Moving B.Flowing C.Going D.Coming17A.obvious B.heavy C.apparent D.strong18A.weird B.stressed C.relaxed D.strange19A.with B.on C.for D.by20A.atbest B.athome C.atheart D.athand
Agardenthat'sjustrightforyouHaveyouevervisitedagardenthatseemedjustrightforyouwheretheatmosphereofthegardenappearedtototalmorethanthesum总和ofitsparts?36.Butitdoesn'thappenbyaccident.Itstartswithlookinginsideyourselfandunderstandingwhoyouarewithrespecttothenaturalworldandhowyouapproachthegardeningprocess.●37Somepeoplemaythinkthatagardenisnomorethanplantsflowerspatternsandmassesofcolor.Othersareconcernedaboutusinggardeningmethodsthatrequirelesswaterandfewerfertilizers肥料.38.Howeverthereareanumberofotherreasonsthatmightexplainwhyyouwanttogarden.Oneofthemcomesfromourearliestyears.●Recall回忆yourchildhoodmemoriesOurmodelofwhatagardenshouldbeoftengoesbacktochildhood.Grandma'srosegardenandDad'svegetablegardenmightbegoodorbadbutthat'snotwhat'simportant.39﹣﹣howbeinginthosegardensmadeusfeel.Ifyou'dliketobuildapowerfulbondwithyourgardenstartbytakingsometimetorecallthegardensofyouryouth.40thengooutsideandworkoutaplantotranslateyourchildhoodmemoriesintoyourgrown﹣upgarden.Havefun.A.KnowwhyyougardenB.FindagoodplaceforyourowngardenC.It'sourexperienceofthegardenthatmattersD.It'sdelightfultoseesomanybeautifulflowersE.StillothersmaysimplyenjoybeingoutdoorsandclosetoplantsF.YoucanproducethatkindofmagicalqualityinyourowngardentooG.Foreachofthosegardenswriterdownthestrongestmemoryyouhave.
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括 1.主题环境保护 2.展览时间 3.投稿邮箱intlphotoshow@gmschool.com. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
热门题库
更多
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理
高三上学期生物
高三上学期化学
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库
教案备课库
m 
mE. 从t=0时刻开始P.点的振动方程为
m
湘公网安备 43130202000226号