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如图是实验室常用的装置，请根据要求回答问题： （1）仪器①的名称： ． （2）实验室用氯酸钾和二氧化锰制取O2的化学方程式为 ，选用的气体发生和收集装置是 （填装置序号）． （3...
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根据下图回答问题下图是实验室常用的一些装置1仪器a的名称是2实验室制取并收集二氧化碳气体应选择的装置
如图是常用的实验装置请根据要求回答问题.1从安全节能的角度考虑实验室制取氧气最好选用的发生装置是填序
请根据下列装置图回答有关问题1实验室制取CO2所选用的实验装置是____填字母2实验室用B.装置制取
下列是实验室制取气体的常用装置图请根据下图回答问题1写出仪器ab的名称ab2若实验室用高锰酸钾制取氧
请根据下列装置图回答有关问题①实验室用B.C装置制取二氧化碳的化学方程式为.②实验室用高锰酸钾制取氧
下列是实验室制取和收集气体的常用装置图请根据实验要求回答下列问题第2题图1请写出装置图A中标号①的仪
如图是实验室制取和收集气体的常用装置图请根据所给的装置图回答下列问题1请写出装置图A.中标号①的仪器
如图是实验室常用的气体发生装置请回答问题.1用A装置制取气体时反应物的状态和反应条件应满足什么要求2
根据下列实验装置图回答问题1写出a的仪器名称______2在加入药品之前应对实验装置进行______
根据如图所示的装置回答问题1写出标号①的仪器名称2实验室选取A.装置用加热高锰酸钾制氧气时还需改进的
如图是实验室制取和收集气体的常用装置图请根据所给的装置图回答下列问题1请出装置图C中标号②的仪器名称
通过一年的化学学习你已经掌握了实验室制取气体的有关知识请结合如图装置图回答问题1写出有标号的仪器名称
下列两组装置图都与我们学过的气体的制取和性质有关.根据如图A.～E.所给的装置回答问题①实验室用高锰
根据如图回答问题1图中仪器a的名称是2上图中有错误的装置是填字母3实验室制取CO2可选用的发生装置和
.如图是实验室用加热高锰酸钾制取氧气的实验装置图.请据图回答问题.1试管中棉花的作用是_______
如图是实验室用加热高锰酸钾制取氧气的实验装置图请据图回答问题1试管中棉花的作用是__2什么时候才能收
.如图是实验室制取和收集气体的常用装置图请根据所给的装置图回答下列问题1请写出装置图C.中标号②的仪
以下是实验室常用的装置请根据装置回答下列问题1实验室若要制取干燥的氧气应选择装置的连接顺序为填字母
下面是实验室常用的实验装置回答问题1写出带有标号仪器的名称①.2实验室常用盐酸和石灰石反应制取CO2
某同学对气体的实验室制法作了以下探究请根据如图按要求回答问题1装置A中某种仪器的下端必须伸入到液体里
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“虚拟试衣镜”亮相南京国际软件产品博览会该款“虚拟试衣镜”解决了购物者很难观察到试穿衣服时背面的情况摄像头能够监视顾客的移动并将衣服的背面展现给他们如图监视顾客移动的摄像头相当于一个镜顾客离摄像头的距离应在的范围．
下列关于力的说法中错误的是
I'velovedmymother'sdesksinceIwasjusttallenoughtositabovethetopofit.Mothersatwritingletters.Standingbyherchairlookingattheinkbottlepensandwhitepaper.Idecidedthattheactofwritingmustbeamostwonderfulthingintheworld. Yearslaterduringherfinalillness.Motherkeptdifferentthingsformysisterandbrother.Butthedesk.ShesaidagainisforElizabeth. Ineversawherangryneversawhercry.Iknewshelovedme;sheshowedinaction.ButasayounggirlIwantedtohaveheart﹣tohearttalksbetweenmotheranddaughter. Theyneverhappened.Andagulfopenedbetweenus.Iwastooemotional易动感情的.Butshelivedonthesurface表面. AsyearspassedandIhadmyownfamily.Ilovedmymotherandthankedherforourhappyfamily.Iwrotetoherincarefulwordsandaskedhertoletmeknowinanywayshechosethatshedidforgiveme. Myhopeturnedtodisappointmentthenlittleinterestandfinallypeaceitseemedthatnothinghappened.Icouldn'tbesurethattheletterhadevengottoMother.IonlyknewthatIhadwrittenitandIcouldstoptryingtomakeherintosomeoneshewasnot. Butthepresentofherdesktoldmeasshe'dneverbeenabletothatshewaspleasedthatwritingwasmychosenwork.Icleanedthedeskcarefullyandfoundsomepapersinsideaphotoofmyfatherandaone﹣paperletterfolded折叠andrefoldedmanytimes.Itwasmyletter. InanywayyouchooseMotheryoualwayschosetheactthatspeakslouderthanwords. 1Thewriterbegantolovehermother'sdesk. A.afterMotherdied B.beforeshebecameawriter C.whenshewasachild D.whenMothergaveittoher 2Thepassageshowsthat. A.Motherwascoldonthesurfacebutkindinherhearttoherdaughter B.Motherwastooseriousaboutherdaughterinwords C.Motherwrotetoherdaughterincarefulwords D.Motherwrotetoherdaughterincarelesswords 3Theunderlinedwordgulfinthepassagemeans. A.deepunderstandingbetweentheoldandtheyoung B.differentideasbetweenmotheranddaughter C.freetalksbetweenmotheranddaughter D.partoftheseagoingfarinland 4What'sbesttitleofthepassage? A.MylettertoMother. B.Motherandchildren. C.Mymother'sdesk. D.TalksbetweenMotherandme.
Ithinkthathisadviceiswellworth. A.valuing B.tobevalued C.ofbeingvalued D.values
卫星通信移动通信都是利用电磁波来传递信息的电磁波家族里有无线电波红外线可见光紫外线等．下列说法正确的是
Iwasjustabouttogooutthephonerang. A.while B.as C.when D.since
HelloI'mSevernSusukispeakingforE.C.O.﹣theEnvironmentalChildren'sOrganization. Weareagroupoftwelveandthirteen﹣year﹣oldsfromCanadatryingtomakeadifference.Weraisedallthemoneytocomehereourselvestocomefivethousandmilestotellyouadultsthatyoumustmakeachange.I'mheretospeakforallthegenerationstocome.I'mheretospeakonbehalfofthestarvingchildrenaroundtheworldwhosecriesgounheard.I'mheretospeakforthecountlessanimalsdyingacrossthisplanetbecausetheyhavenowherelefttogo. I'mafraidtogooutinthesunnowbecauseoftheholesintheozone.I'mafraidtobreathetheairbecauseIdon'tknowwhatchemicalsareinit.IusedtogofishingwithmydadinVancouvermyhometownuntiljustafewyearsagowhenwefoundthefishfullofcancers.Andnowwehearaboutanimalsandplantsgoingextincteveryday﹣disappearingforever. InmylifeIhavedreamedofseeingthegreatnumberofwildanimalsjunglesandrainforestsfullofbirdsandbutterfliesbutnowIwonderiftheywillevenexistformychildrentosee. Didyouhavetoworryaboutthesethingswhenyouwereatmyage?Allthisishappeningbeforeoureyesandyetweactasifwehaveallthetimeandallthesolutions. HereyoumaybegovernmentofficialsbusinesspeopleorganizersreportersorPoliticians﹣butfirstofallyouaremothersandfatherssistersandbrothersauntsanduncles﹣andeachofyouissomebody'schild. I'monlyachildyetIknowweareallpartofafamily.Weshouldactasonesingleworldtowardsonesinglegoal. 1WhydoesSusukicomeheretospeak? A.ToencouragemorechildrentojoinE.C.O. B.ToshowtheachievementsE.C.O.hasmade. C.Tocallformoreeffortstoprotecttheenvironment. D.ToraisemoneyforthewildlifeinCanada. 2Whydoesthewriternolongergofishinginhishometown? A.Fishingdoesharmtotheenvironment. B.Thenumberoffishisdecreasing. C.FishingisnownotallowedinVancouver. D.Fisharefoundsufferingfrompollution. 3Whatdoestheunderlinedsentencesuggest? A.Theenvironmenthasbecomeworsethanbefore. B.Childreninthepastlivedahappierlife. C.Growingolderhumansdamagetheenvironmentmore. D.Todaychildrenaredoingwhatadultsshoulddo. 4Whoisthespeechdeliveredto? A.Twelveandthirteen﹣year﹣olds. B.Powerfulorinfluentialadults. C.ParentsofthekidsofE.C.O.. D.PeoplehelpedbyE.C.O..
往某容器中匀速注入水直至注满容器底部受到水的压强随时间变化的曲线如下图所示则容器的形状可能是下列的
如图所示是小红自制的吸管风笛当向吸管口吹气时长短不一的吸管会发出不同的声音．这里的不同指的是声音的
分析如图所示的图象下列关于图象信息的说法中正确的是
在测定小灯泡的额定功率的实验中小雨同学选用一个电压表一个电流表一个开关电压为3V的电源额定电压为2.5V电阻约为8Ω的小灯泡和一个标有20Ω1.5A的滑动变阻器进行实验．1请用笔画线代替导线将图甲中的实物电路连接完整．要求当滑动变阻器的滑片向左移动时电流表的示数增大．连线不得交叉选择电流表合适的量程2实验中小雨改变滑动变阻器的阻值多次测量通过小灯泡的电流和它两端的电压根据记录的数据小雨画出了小灯泡电流随其两端电压变化的关系图象如图乙根据图象提供的信息计算出小灯泡的额定功率为W．3另一组的同学在实验时无论如何移动滑动变阻器的滑片P电压表电流表示数均不变小灯泡发光暗淡出现这种现象的原因可能是．
Harmonium簧风琴isabookofpoetrybyAmericanpoetWallaceStevens1879﹣1955.Itwashisfirstbookpublishedin1923.Thebookisacollectionof85poemsdifferentinlengthfromjustafewlinestoseveralhundred. EducatedatHarvardUniversityandNewYorkLawSchoolWallaceStevenslivedinHartfordConnecticutformostofhislifeworkingataninsurancecompany.Hewrotepoemsintheeveningsandonhiswaytoandfromwork.Harmoniumisanunusualbookofhis﹣hisfirstbookitdidn'tcomeoutuntilhewas44yearsoldrepresentingthecumulative累积的poeticworksofhislifeupuntilthatpoint. NowconsideredoneofthegreatestcontributionstomodernpoetryHarmoniumwasnotfullyrecognizeduntilthelastyearsofStevens'life.Harmoniumisalsounusualinbeingentirelysong﹣likeandmusical.Itisamixofnotonlypureandphilosophical哲学的thoughtsbutalsoimaginaryanddisorderedlinesofwords.TomostreadersHarmoniumisespeciallygoodinthevariouswaysStevensputhisthoughtsinpoetry.Therearepopularshortpoemsfullofimaginativedetailsandattentiontosoundandtherearelongerandmorephilosophicalpoemswiththeweightandimportanceofepicpoetry史诗. AlthoughmanyofthepoemshewrotethroughouthislifetimeareaboutthenaturalbeautyofConnecticuthispoemscameoutperhapsmoretrulyfrominsideanimaginativepoeticbeautyashewrote IwastheworldinwhichIwalkedandwhatIsawOrheardorfeltcamenotbutfrommyself; AndthereIfoundmyselfmoretrulyandmorestrange. 1WhyisHarmoniumanunusualbookofthewriter? A.Itwashisfirstandonlybook. B.Itcameoutinhislastyearsoflife. C.Itwasaresultofhispart﹣timejob. D.Itshowshisyearsofworkonpoetry. 2AsagreatworkofmodempoetrywhatisspecialofHarmonium? A.Itisacollectionofonly85poems. B.Itfirstputsphilosophicalthoughtsinpoetry. C.Variousinformthepoemsallsoundbeautiful. D.Connecticutbecomesbelterbecauseofthepoems. 3Whichofthefollowingcanbethebesttitleofthetext? A.WallaceStevensaspecialpoet. B.Ahobbymakesabrilliantpoet. C.Harmoniumbeautifulmodempoetry. D.ToknowConnecticutreadHarmonium.
如图所示是某家庭电路闭合开关灯不亮用试电笔接触c点氖管不发光接触d点氖管发光．则该电路的两处故障分别是．
LiMingwenttotheparkinlastSaturdayafternoonafterhehadalreadyfinishedhishomeworks.Hesawseveralboysskatinginthepondhappily.Suddenlyheheardacryforhelp.Lookedaheadhefoundoneoftheboyshadfallenintothewater.LiMingjumpedintoicywaterimmediatelyandtriedtopulltheboytosafety.Thentheboywasgivenfirstaidbutsooncametomyself.Theboy'sparentscamesoonaftertheyreceivedthephonecall.TheywereverymuchthankfulLiMingwhowastremblingtherewithcold.
如图所示的实验能说明
如图所示OB是以O点为支点的杠杆F是作用在杠杆B端的力G表示OB受到的重力．图中线段AB与力F的作用线在一条直线上且OA⊥ABAC⊥OB则
如图所示两个灯泡完全相同电源电压为6V．闭合开关关于电压表示数和灯L2两端的电压下列说法正确的是
Whatdoyoungpeoplethinkaboutthefutureofurbanlife?Ateacherat1universityaskedhisstudentstothinkabout2theywouldrunacityintheyear202.Herearesomeoftheirideas.Inthefuturecityallshoppingwill3doonlinesoshoppingmallswillnolongerexist.Allcarswillbepoweredby4electricsolarenergyorwind.Seniorcitizensandpeoplewith5disabilitywillbeabletogoanywhereintheworldusinghigh﹣techcameras6attachtotheirheads.Travelinginspacewillbecommonandeachcitywillhave7itownspaceport.What'smoreallformsofrecreationsuchas8gotothecinemaandplayingbowlingwillbefreeofcharge.Acrazyideatofightgarbageproblemisthatthecitywillloadhugespaceships9wastematerialsandsendthemtowardsthesunsoastopreventlandfilland10environmentproblems.
今天火箭是一种非常先进的机器;我们用它把宇航员们送入太空.advanced;which/that引导的定语从句
小明的妈妈买回来一只凤梨满屋都是香香的凤梨味道这表明
E﹣mailaswellastelephonesanimportantpartindailycommunication. A.isplaying B.haveplayed C.wasplaying D.play
thatImadeamistakeImadeanapologyhim. A.Realized;to B.Realize;for C.Havingrealized;to D.Realizing;for
Hearinghisfatherwasseriouslyill. A.heburstintotears B.hiseyeswerefilledwithtears C.hisfacelostitscolor D.tearscametohiseyes
如图所示是利用起重机打捞水中物体的示意图．起重机的吊臂前端由滑轮组组成动滑轮总重为300kg绳重和摩擦不计．现在用此起重机从水中把质量为2×103kg体积为0.8m3的物体G向上提当物体在水中均匀上升时滑轮组上钢丝绳拉力F的功率为3kW．则物体完浸没在水中时受到的浮力为N物体未露出水面前上升的速度为m/s物体离开水面后滑轮组的机械效率是．g＝10N/kgρ水＝1.0×103kg/m3
在中国文化里龙是慷慨的聪明的虽然他们看起来也许有点吓人.generous;scary
HelloListeners.WelcometoHentonHospitalRadio.BeforeourmusicprogramatfourI'mgoingtorepeatsomeofourhospitalrules. Thehospitalcansleep800patients.There're8bedsineachward病房.Thevisitinghoursareintheafternoonfrom230to330andintheeveningfrom700to800.Butrememberonlytwopeoplecanseeyouatthesametime.Sorryaboutthatbutyoucanseewhatwouldhappenifwedidn'thavetheserules. Theotherrulesareaboutourhours.Westartquiteearly﹣﹣﹣youmightnotbeusedtothat.Wewakeyouat6o'clockandbreakfastisat8o'clocklunchisatnoon. There'steaat330andsupperisat6o'clock. Youcanseethenon﹣smokingsign﹣﹣﹣wedon'tallowsmokinginthewards.I'msureyouunderstandwhy.HoweverifyoudoneedtosmoketherearesomesmokingroomswhereItisallowed. Youwillfindtheradioswitch开关onthewallnearyourbedwithyourownheadphonesifyouwanttolisten.It'sourownhospitalradiowishingyouaquickrecovery康复. 1Whodoyouthinkthelistenersmightbe? A.Patients. B.Visitors. C.Doctors D.Nurses 2Howmanywardsarethereinthishospital? A.8 B.80 C.100 D.800 3WhichisNotallowedinthehospital? A.Listeningtothehospitalradio. B.Visitingpatientsinthemorning. C.Smokinginsmoking﹣rooms. D.Gettingupearlyinthemorning. 4Whatprogramwillfollowthisradiotalk? A.Hospitalrules. B.Aweatherreport. C.Afreetalk. D.Amusicprogram.
ThingsPositivePeopleDon'tDoPositivepeopledon'thaveamagicalpowerthatyoudon'tpossess.Insteadoflettingstresscontrolthempositivepeopletakecontroloftheirlifebymanagingstressandtryingtoimproveeveryday.1Theydon'tforgetlittlethings.Isiteasytoforgetlittlethings?CertainlyButpositivepeopledon'tmakeahabitofit.Insteadtheyexpressgratitudeforeveryblessingnomatterhowbigorsmallitis.2Theydon'tseeproblemsasproblems.3Theybelievethateverytroublecomesasanopportunitythatisyettobediscovered.Theytakethechancetochallengethemselvesandimprovethemselves.4Positivepeopledon'tfallfor'loseweightfast'or'getrichquick'lies.Theyknowthatanythingworthhavingrequireshardwork.Theyarecomfortablewiththefactthatachievingsuccessmighttakeabitlongerthantheyexpect.Theydon'tholdontohate.Positivepeopleunderstandthathateonlycausespaininlifeoverandoveragainsotheyletgoofit.5Andtheywillmoveonwithwhattheyhavelearnedfromthepains.A.Theydon'tthinklifeisperfect.B.Theychoosetoacceptandforgive.C.Theydon'texpectsomethingfornothing.D.Problemsareseenaschallengesforpositivepeople.E.Checkoutthefollowingthingstheydon'tdoandreflectonyourself.F.Infactit'sthelittlethingsthatusuallydecidewhethersuccessfinallycomes.G.Positivepeopleexploretheworldwithenthusiasmandcuriosityaskingasmanyquestionsastheycan.
如图所示利用滑轮组将重500N的货箱以0.1m/s的速度匀速提起绳子自由端拉力F为200N不计摩擦和绳重g取10N/kg．求 1拉力的功率 2用该滑轮组将重800N的物体提高1m拉力做的功．
如图所示是“探究阻力对物体运动的影响”的实验装置图． 1小车必须从三个相同斜面的同一高度下滑这是为了 2小车在木板表面运动得最远这是因为 3由此可以推断假如小车在光滑水平面上不受阻力它将．
假定英语课上英语老师要求同桌之间相互修改作文.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2处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处添加一个漏字符号∧并在其下面写出该加的词; 删除把多余的词用删除号\删掉; 修改在错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. NorthwestChinaispartofthesandstormcentreinCentralAsia.Sandstormsbeginsindesertareas.InChinatheyhaveincreasedastheresultofdesertification.Thisisbecauseofclimatechangesorbecausepeoplecutdowntreeanddigupgrass. SandstormssometimesseriousaffectBeijing.Citizenswakeuptoorangeskyandstrongwindsinwhichbringthickdust.Tothewesternofthecityadesertliesonly250kilometresawaygetcloseryearbyyear.Topreventthemthegovernmenthasalreadyplantmorethan30billiontrees.
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