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下列实验操作正确的是（ ）
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高三下学期化学《》真题及答案
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正确的化学实验操作是实验成功的重要保证下列实验操作正确的是
倾倒液体
过滤
检查气密性
检验氧气是否收集满
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的操作是实验安全和成功的基本保证下列实验操作正确的是
取用液体
加热液体
过滤
收集氧气
某化学兴趣小组的同学按下图操作完成粗盐含有难溶性杂质提纯的实验下列说法中正确的是
各项实验操作完全正确
正确的操作顺序为①⑤②③⑥④
去除杂质的关键步骤是④
操作③④中玻璃棒的作用是相同的
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
过滤河水
检查装置气密性
选择下列部分实验操作可完成两个实验甲实验为除去粗盐中难溶性的杂质乙实验为配制溶质质量分数为10%的氯
操作①和⑤中玻璃棒的作用是相同的
甲实验和乙实验都要用到实验操作①
甲实验在操作⑤时，将水全部蒸发后停止加热
乙实验在操作③时，若俯视读数，会使所配制溶液的溶质质量分数偏小
正确的化学实验操作是实验成功的重要保证下列实验操作正确的是
倾倒液体
过滤
检查气密性
氧气验满
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的化学实验操作是实验成功的重要保证下列实验操作正确的是
倾倒液体
过滤
检查气密性
检验氧气是否收集满
正确的实验操作对实验结果人身安全非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
倾倒液体
正确的实验操作对实验结果人身安全非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的实验操作是实验成功的基本保证下列实验操作正确的是
检查装置气密性
蒸发
加热液体
量取液体体积
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
下列与演示实验基本要求无关的叙述是
讲清演示实验的步骤和方法
引导学生分析实验现象
指导学生正确操作
方法要科学、操作要规范
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
读取液体体积
正确的实验操作是实验成功的基本保证下列实验操作正确的是
检查装置气密性
蒸发
加热液体
量取液体体积
正确的实验操作对实验结果人身安全非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
加热液体
倾倒液体
正确的实验操作是实验成功的基本保证下列实验操作正确的是
检查装置气密性
蒸发
加热液体
量取液体体积
正确的实验操作对实验结果人身安全都非常重要下列实验操作正确的是
点燃酒精灯
滴加液体
过滤河水
检查装置气密性
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用手握住较长软绳的一端连续上下抖动形成一列简谐横波．某一时刻的波形如图所示绳上ab两质点均处于波峰位置．则
甲乙两个弹簧振子它们的振动图象如图所示则可知两弹簧振子
Whyshouldmankindexplorespace?Whyshouldmoneytimeandeffortbespentexploringandresearchingsomethingwithsofewapparentbenefits?WhyshouldresourcesbespentonspaceratherthanonconditionsandpeopleonEarth?Thesearequestionsthatunderstandablyareveryoftenasked. Perhapsthebestanswerliesinourgeneticmakeupashumanbeings.Whatdroveourancestorstomovefromthetreesintotheplainsandonintoallpossibleareasandenvironments?Thewiderthespreadofaspeciesthebetteritschanceofsurvival.Perhapsthebestreasonforexploringspaceisthisgenetictendencytoexpandwhereverpossible. Nearlyeverysuccessfulcivilizationhasexploredbecausebydoingsoanydangersinsurroundingareascanbeidentifiedandpreparedfor.Withoutknowledgewemaybecompletelydestroyedbythedanger.Withknowledgewecanlessenitseffects. Explorationalsoallowsmineralsandotherpotentialresourcestobefound.Evenifwehavenoimmediateneedofthemtheywillperhapsbeusefullater.Resourcesmaybemorethanphysicalpossessions.Knowledgeortechniqueshavebeenacquiredthroughexploration.Thetechniquesmayhavemedicalapplicationswhichcanimprovethelengthorqualityofourlives.Wehavealreadybenefitedfromotherspin﹣offsincludingimprovementsinearthquakepredictioninsatellitesforweatherforecastingandincommunicationssystems.Evennon﹣stickpansandmirroredsunglassesareby﹣productsoftechnologicaldevelopmentsinthespaceindustry! Whilemanyresourcesarespentonwhatseemsasmallreturntheexplorationofspaceallowscreativebraveandintelligentmembersofourspeciestofocusonwhatmayservetosaveus.Whilespacemayholdmanywondersandexplanationsofhowtheuniversewasformedorhowitworksitalsoholdsdangers.Thedangerexistsbutknowledgecanhelphumanbeingstosurvive.Withouttheabilitytoreachoutacrossspacethechancetosaveourselvesmightnotexist. WhileEarthistheonlyplanetknowntosupportlifesurelytheadaptiveabilityofhumanswouldallowustoliveonotherplanets.Itistruethatthelifestylewouldbedifferentbuthumanlifeandcultureshaveadaptedinthepastandsurelycouldinthefuture. 1Whydoestheauthormentionthequestions? A.Toexpresshisdoubts. B.Tocomparedifferentideas. C.Tointroducepointsfordiscussion. D.TodescribetheconditionsonEarth. 2Whatisthereasonforexploringspacebasedon? A.Humansarenatureborntodoso. B.Humanshavethetendencytofight. C.Humansmayfindnewsourcesoffood. D.Humansdon'tliketostayinthesameplace. 3Theunderlinedwordspin﹣offsinParagraph4probablyrefersto. A.survivalchances B.unexpectedbenefits C.potentialresources D.physicalpossessions 4Whichofthestatementscanbestsumupthepassage? A.Spaceexplorationhascreatedmanywonders. B.Spaceexplorationprovidesthebestvalueformoney. C.Spaceexplorationcanbenefitscienceandtechnology. D.SpaceexplorationmayhelpusavoidpotentialproblemsonEarth.
JoiningUsasaGamesVolunteer! Thesuccessofthe2020TokyoOlympicGamesdependsonyourcontribution!JoinusasaGamesVolunteer! GamesvolunteerswillbedirectlyinvolvedinassistingGamesoperationsbefore.duringandaftertheTokyo2020GamesGamesvolunteerswillguideathletesaroundwelcomeimportantpeopleandhelplostvisitors NumberofVolunteeringDaysandDailyHours ※TheTokyoOlympicGameswillbeheldfromFriday24JulytoSunday9August2020.InprincipleGamesvolunteerswillberequiredtoworkforatleastafortnightbeforeduringandaftertheOlympicGames. ※Gamesvolunteerswillworkapproximatelyeighthoursperdayincludingrestbreaks.Actualshiftlengthsdependoneventschedulesactivitiesactivitysitesetc. AgeandResidentialRequirements Applicantsmustfulfillthefollowingtworequirements ※BornonorbeforeApril12002 ※JapanesenationalorpersonwithvalidvisapermittingresidenceinJapanduringthevolunteerperiodtemporaryvisitorsincluded.NativespeakersofEnglishwillbepreferred. NumberofGamesVolunteerOpportunities 80000 MethodandApplicantCategories ※Applicationswillbesubmittedonline ※Individualsonly OffersandConfirmation Thoseapplicantswhoattendthetrainingsessions会议andareassignedavolunteerrolewillbeofferedtobecomeaTokyo2020Gamesvolunteer. Pleasenotethattheaboveofferwillbecancelledintheeventofanyofthefollowing ※IfthevolunteerengagesinanyactivitythatdamagestheimageoftheTokyo2020Games ※Ifthevolunteerengagesinanyactivitythatseverelydamagesteamwork ※Ifanyinformationcontainedintheoriginalapplicationformisclearlyfoundtobefalse ItemsandWelfaresProvidedtoVolunteers VolunteerswillbeprovidedwithasetoffreeOlympicGamesvolunteeruniformsandmealsduringtheworkday. 1AGamesvolunteerwillberequiredtoworkforatleast. A.oneweek B.twoweeks C.threeweeks D.fourweeks 2WhowillbemorelikelytobeacceptedasaGamesvolunteer? A.AChinese B.ARussian C.AnAustralian D.AGerman 3WhatwillGamesvolunteersbeprovidedwithforfree? A.Accommodation. B.Clothing. C.Transportation. D.Amusements
15分LastyearmybrotherandIwenttoMiamiforavacation.Someofmyfriendswhohadbeentherebeforesaiditwas1wonderfulholidaydestination.Beforewewentwehadplannedformonths.Whenthedaycamewewereready. Sinceitwasthefirsttimewe2betherewewereprettyexcited.Afterourplanelandedwewenttothehotel.Wehadmade3wereservationsixmonths4earlybutthemanatthefrontdesksaidtherehadbeenamistake.We5tellthatourroomshadn'tbeenreservedforthatweek6fortheweekafter.Ididn'tunderstandwhythiswouldhappenandmycreditcardhadalreadybeenchargedforthereservation.What'sworsethehotelhadbeenfullybooked.Whenwe7wonderwhattodothemanagercameout.Shewas8surprisehelpful.SheapologizedforthemistakeandgaveusaspareVIProomonthetopfloor.Wehadneverstayedinsuchanamazingroomandweweren'tchargedextra. ThenextdaymybrotherandIwenttothebeach9somepeoplewereplayingvolleyball.Wegotalittle10sunburnbutthedayhadbeensorelaxingthatwedidn'tmind.
磁体的磁感线是
10分请修改下面这篇短文.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. 增加在缺词处加一个漏字符号∧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. Goodmorningeveryone!NowI'dliketosharingmyviewinreading.Ithinkreadingisoneofthemorebeneficialandpracticalactivitiesthatamancando.Itisthroughreadingwhichapersonisabletodiscovernewideasplacesandpeople.EventhoughIhadaheavyloadofclassesIcanmanagetofindaboutfortiethminutesadaytoreadbooks.Iprefertoreadbeforesleepingorwhilewaitingabus.Asaresultyoucanwritemanygoodarticle.Icanalsotakepartinconversationwithotherseasy.Letsreadsomebookstogetherandtalkaboutthemanexttime! That'sall.Thankyou.
太阳是一颗自己能发光发热的气体星球它的能量来自于反应．行星在太阳的引力作用下几乎在同一平面内绕太阳公转距离太阳越近的行星公转周期大小越．
天然放射性元素衰变时放出的β射线是
在一只锥形瓶中放入一个气球把气球的开口翻在锥形瓶的瓶颈上如图所示然后向气球吹气将会发生的现象是已知在封闭瓶口时瓶内被封闭的气体体积V压强p0．若忽略气球薄膜产生的弹力认为气球内外压强相等同时忽略吹气时温度变化．在人吹出的气体压强达到1.1p0时气球的体积增加量为V．
8分WhenIwas5yearsoldIstartedlosingweight.MyparentsnoticedIwaspaleandalwaysthirsty.Theyhadmetestedtoseeifmybloodsugarwashighbecausetheythoughtthatmightbecausingmysymptoms. Mybloodsugarwasfivetimeshigherthannormal.Thatcanbedeadly.Myparentsrushedmetothehospital.That'swhenmywholelifechanged. ThedoctorssaidIhadType1Diabetes糖尿病.Thatmeansmybodycan'tmakeinsulin胰岛素.There'snocure. MyparentshadtogivemeinsulinshotseverydayandIhadtogetovermyfearofneedlesquickly.SometimesIhad10band﹣aidsonmyfingersatonce. NowthatI'molderIcheckmyownbloodsugarandgivemyselfshots.AboutfouryearsagomymomstartedtravelingtoruralGuatemala.Shegoestwiceayeartohelppeopleinneed. IhavebeenaGirlScoutsincekindergarten.ForaGirlScoutprojectIputtogetherateamtogotoGuatemalatotestpeopletherefordiabetes.WewentforfourdayslastJuly.Wetested378childrenand100adults.Wefoundthreeadultswithadifferentkindofdiabetescalledtype2.Wealsofoundonelittlegirlwithdangerouslylowbloodsugar.Shecriedwhenwetoldher.Shehadbeenfeelingdizzyanddidn'tknowwhy.ItwaslikereplayingwhathappenedtomewhenIwaslittle.Italkedthroughatranslatorbuteveryoneunderstoodhugs.IgavemorehugsthanI'veevergiven. Havingtype1diabetesishard.ButIhaveaccepteditreadily.Ithashelpedmemeetamazingpeople.Ithasmademeresponsibleandindependent.Ithasalsoshownmethepoweroftakingaction.I'mgoingbacktoGuatemalathissummertotestmorekids.IwanttohelpasmanykidsasIcan.Butmygreatestwishisforacure.Type1diabeteschangesyourlife.Ifnootherchildeverhastohaveitthatwouldbeamazing. 1Whydidtheauthor'sparentshaveherbloodsugartested? A.Theyfoundthatshewaspale. B.Theynoticedthatshewasthirsty. C.Theydoubtedifshewasill. D.Theywonderedifshewastired. 2Whatdoweknowabouttheauthor? A.HerTypeIDiabeteswascured. B.Shelostheartaftertheexamination C.Shesufferedalotfromthedisease. D.Sherefusedinsulinshotsforfearofpain 3WhydidtheauthorgotoGuatemala? A.Hermotherrequestedherto. B.Shehopedtohelppeoplethere. C.HerGirlScoutleadermadeamedicalteam. D.Shewantedtostartherround﹣the﹣worldtrip. 4Whatisthemainideaofthepassage? A.SheliveswithTypeIDiabetes. B.ShehaswonderfulexperiencesinGuatemala. C.Unexpectedtripmakeshermoreconfident. D.Shelivesamazinglydespitethediabetes.
如图所示一足够长的固定斜面的倾角为θ＝37°质量m＝1kg的物体受到平行于斜面的力F作用由静止开始运动．力F随时间t变化规律如右图所示以平行于斜面向上为正方向g＝10m/s2sin37°＝0.6cos37°＝0.8物体与斜面间的滑动摩擦因数为0.25求 1第1s内物体运动的加速度大小a1 2第2s内物体运动的加速度大小a2 3第1s末物体的动能的大小EK1 4请描述物体在第4s内的受力情况或画出受力分析图并说明理由．
8分Sharpshootersrefertothosewhoareskilledatfiringagunandaccuratelyhittingwhattheyareaimingat.Howeversomefisharealsocalledamazingsharpshooters.Peoplewonderhowtheyhittheirtargetswithoutusingtools?Byspitting!Thefishshootsoaccuratelythattheyrarelymisstheirtarget. Theseamazingfisharearcherfish印度射水鱼.ThereareseveraldifferenttypesofarcherfishlivinginSoutheastAsia.Theyspitattheirdinnertocatchit.Tocatchdinnerafishfirstsetsitselfinacertainplaceforexamplejustbelowthesurfaceofthewater.Itputsthetipofitsmouthsoitbarelybreaksthroughthewater.Thenthefishwaitsforanunsuspectinginsecttolandonaleaforbranchhangingoverthewater. Whenanunsuspectingorunknowinginsectlandsthefishattacks.Thefishsqueezesitsgill腮coversveryrapidlywhichforceswaterintothefish'smouth.Intheroofofitsmouththefishhasagroove槽.Thefishformsthesmallgrooveanditstongueintoanarrowtubebypressingitstongueupagainstitsgroove.Thewaterforcedintothefish'smouthisforcefullypushedoutofthefish'smoulhthroughthetube.Archerfishhavebeenknowntosendastreamupto5meters16feet.Howeverarcherfishcanonlyshootinsectsupto1﹣2meters3﹣6feetawayduetotheirlimitedaccuracy. Whentheunsuspectinginsectishitwithasuddenstreamofwateritisknockedintoorfallsintothewater.Onceinthewatertheinsectbecomesdinner.Archerfishlearnhowtospitwhentheyareyoung.Theygetmoreaccuratewithpractice.Adultarcherfishrarelymiss. Withinameterarcherfishwilloftenspringoutofthewaterandgrabaninsectintheirmouths. 1Paragraph1flinctionsasan. A.background. B.comment. C.explanation. D.introduction. 2Whichofthefollowingistherightstepsofarcherfish'shuntingforaninsect? a.Ithasitstonguepressedagainsttheroofofitsmouth. b.Itgatherswaterintoitsmouthbysqueezingitsgillcoversquickly. c.Itshootsastreamofwaterattheinsectabovewater. d.Itstaysunderwaterforaninsecttolandnearby. A.adcb B.dbac C.dbca D.adbc 3Ifaninsectis3feetawayanarcherfishwilloftentocatchit. A.jumpoutofthewater B.spitakindofoilyliquid C.shootastreamofwateratit D.pushitstongueoutofitsmouth 4Archerfishcan'thitinsects5metersawayforthereasonthat. A.theireyesightislimited B.theycan'thitfarawayinsectsprecisely C.theirmouthsareunderthesurfaceofwater D.thelongestdistancetheycanhitisatmost5meters
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