首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
下列实验不能达到实验目的是（ ）
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
下列是的三个实验按要求回答问题1实验C.中烧杯③的作用是2上述不能达到实验目的的实验是填序号为实现相
下列实验操作中不能达到实验目的是
A
B
C
D.
下列实验操作不能达到实验目的的是
为了验证口腔的分泌液中有蛋白酶某学生设计了两组实验如下图所示在37℃水浴中保温一段时间后l2中加入适
实验①
实验②
实验①、实验②都能
实验①、实验②都不能
为了验证猪笼草分泌液中有蛋白酶某学生设计了两组实验如图所示在35℃水浴中保温一段时间后甲乙试管中加入
只有实验①能
只有实验②能
实验①、实验②都能
实验①、实验②都不能
下列不能达到实验目的的是
A.
B.
C.
D.
下列实验操作不能达到实验目的的是
下列验证ZnFeAg三种金属活动性顺序的实验方案中-表示未进行金属与盐溶液之间的实验不能达到实验目的
A
B
C
D.
下列相关实验不能达到预期目的的是
仅①
①④
②③
③④
下列实验不能达到实验目的是
实验①为检查装置气密性
实验②为证明酸与碱能发生反应
实验③为验证不同物质的着火点不同
实验④为收集氧气
根据下列实验方案进行实验不能达到相应实验目的的是
测定空气中氧气的含量
检验氧气是否收集满
验证物质燃烧需要氧气
探究影响物质溶解性的因素
下列实验不能达到实验目的的是
实验①为检查装置气密性
实验②为证明不同催化剂对过氧化氢的分解影响
实验③为验证不同物质的着火点不同
实验④为收集氧气
用下列装置进行实验不能达到实验目的是
干燥 CO2
收集 O2
验证 CO2 性质
监控气体流速
下列是的三个实验按要求回答问题1实验C.中烧杯③的作用是2上述不能达到实验目的的实验是填序号为实现相
用下列装置进行实验不能达到实验目的的是
干燥CO
2
收集O
2
验证CO
2
性质
监控气体流速
用下列实验装置进行的实验中不能达到相应实验目的的是
装置甲：防止铁钉生锈
装置乙：萃取碘水中的碘
装置丙：实验室制取乙酸乙酯
装置丁：海水蒸馏得淡水
下列实验设计不能达到实验目的是
如图在甲乙两个用于验证质量守恒定律的实验中你认为哪一个能够达到实验目的另一个不能达到实验目的的原因是
根据下列实验方案进行实验不能达到相应实验目的是
2.5分下列实验方法不能达到实验目的是
热门试题
更多
﹣﹣﹣Whereisyourfather?﹣﹣﹣HeishelpingJennyashelfabovethebed. A.putin B.puton C.putup D.putout
1分Pleasecheeryouupwithsongsandgamesduringthejourneyboysandgirls!
Themoreyoureadthewealthyouwillfeelinspirit.
﹣IseeyourIDcardsir? ﹣Noproblem.Hereyouare. A.Can B.May C.Need D.Must
20分紧张而又忙碌的初中生活即将结束在装载你收获的行囊﹣﹣成长记录袋时还应增添一份你自己满意的答卷.请以去三年中难忘的校园生活并描述你自己对将来学习生活的期望.文章还应包括以下要点:具体要求1.词数100词左右开头已给出不计入总词数;2.文中需包括所有写作要点但不要逐字翻译适当加入过渡词句使短文通顺电瓶车隔热坐垫3.文中不能出现考生真实姓名和学校名称.MyUnforgettableSchoolLifeHowtimefiles!Mycolorfulmiddleschoollifeisnearlyending.HereiswhatIthinkofaboutmyself.
Itmustdriveyoumadwhenyouarewatchingamovieonlineanditsuddenly66sandloads载入again.Butdon'tbeangry.Theproblemmaybesolvedinthenearfuture. OnMarch14thPremier__LiKeqiangsaidthegovernmentshould67iInternetservices.OnlyonedaylatertheMinistryofIndustryandInformationTechnology工信部repliedthattheywouldtakeactiontodeveloptheInternetfora68hspeedandlowercosts. TerribleInternetspeedshavecausedmuchtroubleinChina.AccordingtoarecentsurveythatwasmadebySina66%ofpeoplewerenot69swithChina'sInternet. China'sInternetconnectionspeedis70sthanthatinmanyothercountries.Theaverage平均InternetspeedinChinawas4.25megabits兆位persecondMbpsinlate2014.SouthKoreahadthefastestspeed.Itwas25.3Mbps.Peoplecandownloada1GBmoviewithinsixminutesinSouthKorea71binChinaitwouldtakehalfanhour. Butsadlythe72pforthebadInternetisnotlowinChina.Thesurveyshowsthatnearly70%ofpeoplespent￥50﹣200amonthonInternetservices. Themostimportantthingweneedtodonowisto73bmorefibernetworks光纤网络.Throughfiberswecansendtextsmusicpicturesandvideosin74lthanasecond.Wealsoneedtohavemorecompaniesto75ecompetitionsothatwewillofferbetterservicessaidTheBeijingNews. 66. 67. 68. 69. 70. 71. 72. 73. 74. 75.
﹣﹣﹣IsthisphototakenatGaoyouLake? ﹣﹣﹣Yes.Youcanseetheopenwaterintheofthephoto. A.form B.shape C.background D.introduction
ItwasmybirthdaylastThursday.Idecidedto16itbyinvitingsomefriendsouttosupper.Ichosearestaurantina17partoftown.Itisoneofmyfavoriterestaurantsbecausethefoodisgoodandthewaitersarefriendly.It's18crowdedbecausenotmanypeopleknowabouttheplaceIthink.Soitisnotusually19tobookatableandThursdayisnotabusyeveningasusual. Whenweenteredtherestaurantweweresurprisedtofinditcompletely20.Ilookedaroundbutnotablewasfree.Oneofthewaitersknewmeandcameuptoexplain.Manytouristscameinabouthalfanhourago.hesaid.Itwaslikeaninvasion侵略.Wecanhardly21. Thewaiterthenpointedtoatableinthecorner.Thepeopletherearegoingto22hesaidJustholdonandyou'll23aplacethere.Hewasright.Fifteenminuteslaterthepeopleatthecornertablepaidtheir24gotupandleft.Iledmyfriendsthereandweallsatdown. itseemedthatnowaiternoticedusatthelonelycorner.Severaltimeswetriedtoaskthewaiter26sentustherebuthelikealltheotherwaiterswasbusywiththetourists.Theyorderedlotsoffood.Atlastanhourlaterthetouristsleftlookingvery27withlife.Thetiredwaiterthenappearedatourtable.I28myfriendsaboutthebestdishesandfinallythewaiterwentoffwithour29. Afewminuteslaterhereturnedtoourtable.Wecouldtellfromhisfacethathehad30forus.Lookingalittlesorryhetoldusthattherewasnomeatorfishleft.Allwecanofferyouhesaidisanomelet煎蛋卷! 16.A.remember B.celebrate C.have D.support 17.A.quiet B.calm C.busy D.noisy 18.A.sometimes B.often C.seldom D.always 19.A.necessary B.possible C.important D.easy 20.A.empty B.full C.free D.quiet 21.A.watch B.work C.try D.manage 22.A.start B.leave C.end D.pay 23.A.find B.book C.wait D.see 24.A.money B.bill C.food D.drinks 25.A.Luckily B.Hopefully C.Suddenly D.Unluckily 26.A.whom B.which C.he D.who 27.A.exciting B.tired C.pleased D.unhappy 28.A.bought B.offered C.advised D.cooked 29.A.dishes B.food C.order D.menu 30.A.nicefood B.poorfood C.goodnews D.badnews
Manypeoplegotacoldbecausethetemperature下降alotyesterday.
Asadoctoryoushouldn'tbetoopatient.
10分TheVeniceHistoricalRegatta EveryyearonthefirstSundayofSeptembertheHistoricalRegattatakesplaceinVenice.IthasbeenoneofthemostimportantfestivalsinVenicesince1315.InthebeginningtheeventwasorganizedtocelebratethereturnofCatherineCarnarothequeenofCyprus.Todayitisacelebrationofjoyandfriendship. TheHistoricalRegattaismadeupoftwoparts:aparadeandarowingboatcompetiton.Thecelebrationstartswithaparadeofboatsonwater.Theboatsintheparadearecolourfulandmanyofthemhavegoldenpaintingonbothsides.Peopleontheseancient﹣styleboatswearclothesfromthesixteenthcentury. AftertheparadethereisacompetitionontheGrandCanal.Itiswatchedbythousandsofpeople.TheRegattaisthemostimportanteventforeveryrower.ForthemwinningonthatdaymeanstobecomepartofthehistoryofthissportandofVenice.SorowersalloverVenicelookforwardtojoininginandwinningthiscompetition.Traditionallythe1stplacewinnerwasawardedaredflagwhilethe2nd3rdand4thplacewinnersreceivedwhitegreenandblueflags.Someotherawardsweregivenalongwiththeflags.Oneofthemwasalittlelivingpig.Butsincesomeanimalprotectionorganizationsobjecttothisthepigawardhasbeencancelled. WhentheRegattaisfinishedthecityisfullofpeoplecelebratingamongallthenoise. ThereareexcitingperformancesintheimportantsquaresofVenice. 56.WhendoestheHistoricalRegattatakeplaceeveryyear? 57.WhatistheHistoricalRegattamadeupof?Innomorethansevenwords 58.HowmanypeopleisthecompetitionontheGrandCanalwatchedby?Innomorethanthreewords 59.Whatwasthe1stplacewinnerawarded?Innomorethanthreewords 60.Whyhasthepigawardbeencancelled?
Ifyoucan'tdecidewhichofthetwoCDstobuywhydon'tyoutake?Youcanbuyone andgetonefreetoday. A.all B.any C.both D.either
生活中爱运动的人越来越多但也有些人不太喜欢运动.你校就学校应不应该召开运动会进行了调查请根据以下调查结果写一篇英语短文并简要发表你自己的观点. 注意 1.根据要点可适当发挥但不要逐条翻译 2.字数100左右.文章开头已经给出不计入总词数 3.作文中不得提及考生所在学校和本人姓名. Somepeoplelikesportswhileothersnotinourlife.Recentlyourschoolhadasurveyaboutwhethertheschoolshouldholdasportsmeetingornot.Differentstudentshavedifferentopinions.
好书对每个人都是有价值的尤其对青少年..
1分﹣Whatelseshouldwepayattentiontobuildingthebridge? ﹣﹣ThechangeoftheweatherIthink. A.finish B.finished C.tofinish D.finishing
It'simportantforustoprotectnaturebecauseweitsrichresourcestolive. A.dependon B.leavefor C.giveup D.leadto
1分Readingisimportantforitcanopenupan未知的worldtous.
每天早晨许多游客集中在那个广场上观看升国旗.
AreportfromtheUnitedNationsUNsaystheworldneedsanother69millionteachersbytheyear2030.TheUNagencyUNESCOmadeapromisein2015thateverychildintheworldistoreceiveprimaryandsecondaryeducationwithinthenext14years.Nowthereare263millionwhodonotgotoschool.Around25millionofthesemight nevergetaneducation.Theagencysaysalotofworkneedstobedonetofindenoughteachersforschools.Themostteachersareneededinsub﹣Saharan撒哈拉沙漠以南的AfricaandSouthernAsia. TheUNreportwarnsthattherearenotenoughteachersincountrieswithrisingpopulations.Thismakesithardertofindenoughteachers.ItsaysWithoutquickandcontinuingactionthesituationwillbecomeworseinthefaceofrisingneedfor education.UNESCOisalsoworriedaboutthequality质量ofteachersinsomecountries. IncountrieslikeGhanaLiberiaandSierraLeonefewerthan60percentofteachersinprimaryschoolshavebeentrained.Therearealsoworriesaboutclasssizes.TheUNsaysIncountrieslikeMalawiitiscommontofindover100childreninoneclass.Thishasbeenaproblemformanyyears. 1.Howmanychildrenaroundtheworldmightnevergetaneducation? A.Morethan69million. B.About25million. C.About263million. D.Lessthan14million. 2.Fromtheunderlinedsentencewecanlearnthatsub﹣SaharanAfricaandSouthernAsia. A.arefullofteachers B.arepopularwithteachers C.areveryshortofteachers D.willinvitemoreteachers 3.It'sdifficulttofindenoughteachersinsomecountriesbecause. A.peopledon'tliketobeteachers B.thegovernmentspaynoattentiontoeducation C.theyaretoopoortocallinteachers D.therearemoreandmorechildrenbeingborn. 4.Whatcanweinferfromthepassage? A.300millionchildrendonotgotoschoolatpresent. B.It'snotverydifficulttofindenoughteachersforschools. C.InLiberiamorethan60%ofteachershavebeentrained. D.TherearetoomanystudentsinaclassroominMalawi. 5.Thewriter'spurposeforthispassageisto. A.letpeopleknowtheeducationalsituation B.advisepeopletobecometeachers C.encouragepeopletohelppoorchildren D.tellpeopletheimportanceofeducation
1分Thefatherisquiteinagreewithwhathissonsays.
1分luckshefellintothegrassorshemighthavehurtherhead.
﹣﹣﹣Howareyougettingalongwithyourclassmates? ﹣﹣﹣Verywell.Theyareallme. A.afraidof B.friendlyto C.angrywith D.sorryfor
10分TimetableofHappyChildren'sPalace MONDAY19:00﹣20:30EnglishlearningProf.G.WhiteWouldyouliketoimproveyourEnglish?Thisisformiddleschoolstudents.2weeksTUESDAY17:30﹣19:00Photography摄影Mr.GreenLearntotakegoodpictures.Bringyourowncamerawithyou.4weeksWEDNESDAY18:00﹣19:00Office2000Prof.WangLanLearnhowtousethenewsoftware.10weeksFRIDAY19:00﹣20:30PaintingMissYangJingWouldyouliketolearnpainting?Itisforbeginnersonly.16weeksSATURDAY15:00﹣16:30CambridgeYoungLearner'sEnglishProf.J.BrownThiscourseisforthechildrenatprimaryschool小学.20weeksSUNDAY10:00﹣12:00SwimmingclubCoach:LiuXinWanttoswimasfastasafish?9weeks 1.YoucannotgotoHappyChildren'sPalacetolearnsomeskillson. A.Monday B.Wednesday C.Thursday D.Sunday 2.IfyouwanttoimproveyourEnglishyou'dbetterlearnitfrom. A.MissYang B.Prof.J.Brown C.Prof.WangLan D.Prof.G.White 3.Ifyouareinterestedinpaintingandwanttobeanartistyoucanhavetheclasses. A.from19:00to20:30onFriday B.from17:30to19:00onTuesday C.From19:00to20:30onMonday D.from18:00to19:00onWednesday 4.Ifyoudon'thaveenoughtimeandyouwanttolearnaskillinamonthyou'dbetterlearn. A.Swimming B.painting C.howtotakepictures D.howtousethenewsoftware 5.WhichofthefollowingstatementsisTURE? A.Pro.G.WhitegivesatalkaboutEnglishLearningforstudentsonMondaymorning. B.Youcanlearnhowtouseoffice2013fromProf.J.Brown. C.IfyouwanttolearnswimmingyoushouldgototheswimmingclubonSundayafternoon. D.Prof.J.BrownteacheschildrenEnglishfrom15:00to16:30onSaturday.
Lifeisaseriesofgoodandbadthingsbigandsmall.IfIrememberallthebadthingsrightfrommychildhoodwouldn'titbesilly?SuchasoneofmyparentswhohitmewhenIwasyoungthepre﹣schoolkidwhowouldn'tshareherredinkwithmethethird﹣graderwhowouldkeeppullingmyhairorthestrangeratthebusstopwhowouldn'tletmegetonthebusfirst…It'sterribletorememberallthoseunwantedmemories.ThankGodforourfading衰退的memories. Ifwealwaysremembereverythingthatwe'veeverreadorexperiencedwewouldnotonlybewalkingencyclopedias百科全书butalsobetheunhappiesthumansontheearthbecausewewouldalsorememberthemomentsthatsomeoneshoutedatusorhitusdeeply.Imaginewhatwouldhappentousifwecarrythishugeloadoffeelingsinourbodybags?Withtheweightthatwecarryaroundwewouldbepulleddownintothedeepholeofnegative消极的thoughtandcouldn'tgoout.Ifwelearntoletgoofallthenegativethoughtsortheunwantedmemorieslifewouldbemuchmoreenjoyable. Lifeislikeanapple.Ifoffersusthechoiceofthegoodpartandthecore核thatwecan'teat.Haveweworriedaboutthrowingawaythecoreevenforamoment?OfcourseNO.Thenwhydoweholdontoallthoseunpleasantmemoriesandnottosweepthemaway?Don'tyouwanttoeatthejuicyandtastypart?Willyoueatthehardcoreinstead? It'suptoyouchildrentochooseforyourself.There'snodoubtthatyoushouldchoosetoletgoofthecoreorenjoythefleshoftheappleoflifetothefullest. 42.Thepassageisthemostlikelytobewrittento. A.kids B.adults C.scientists D.teachers 43.Inthewriter'sopinionifonealwaysrememberseverythinghewould. A.bethecleverestperson B.haveanenjoyablelife C.improvehismemory D.betheunhappiestperson 44.FromParagraph3thewriterwantstotellusthat. A.thereareonlybadthoughtsinourlife B.itisimpossibleforyoutochooseyourlife C.lifeshouldbelikethejuicyandtastypartofanapple D.ourmemoriesdyingawayisreallyabadthing 45.Thebesttitleforpassagewouldbe. A.Rememberonlygoodthings B.Throwawayapplecores C.Learntoforgetourmemories D.Letallthememoriesgo
﹣﹣﹣Wouldyouplease借meyourbike?﹣﹣﹣Certainly.
1分John后悔notattendingtheimportantconferencethedaybeforeyesterday.
Nowmoreandmorepeopleareusedtobuythingsonline.
﹣﹣﹣Allthecitizensshouldworktogethertomakeourcitymorebeautiful. ﹣﹣﹣That'sit.. A.Practicemakesperfect B.Afriendinneedisafriendindeed. C.WheninRomedoastheRomansdo D.Manyhandsmakelightwork.
1分﹣Soyougaveheryourmobilephone? ﹣.Shesaidshe'dreturnittomeaftersheboughtanewone. A.Mypleasure B.Notexactly C.Withpleasure D.Noproblem
Twelveformewasahardyear.Imovedtoanewtownwithmyfatheraftermymotherdied.Iwasterriblylonelyandwouldcrymyselftosleepeachnight.Tocheermeupmyfatherboughtanoldhorseforme.InamedhimKnight. Knightwasnotahandsomeone.ButIdidn'tcare.Ilovedhimfornoreason.IjoinedaridingclubbutpeoplealllaughedatKnight'slooks.Theothermembersrodebeautifulhorses.InevertoldothersabouthowIfelt. WhenKnightandIenteredtheeventsaboutappearancewewerequicklyshownthegate.NothingcouldturnKnightintoabeauty.Ihadtobeinthespeedevents.Ichosethejumpingrace. OnegirlnamedJoycerodeabigbrownhorseintheraceevents.Shealwayswontheblueribbons蓝丝带.Ofcourseshedidn'tfeelthreatened威胁whenIwasin.Shealwaysthoughtshewasthebestandlookeddownonothers.Thatmademedecidetobeatherthoughitwouldbemyfirstrace. ForthewholenextmonthIwokeupearlyeverydayandrodeKnightfivemilestothearena赛马场.Wepracticedrunningandjumpingforhoursinthehotsun. Ourhardworkdidn'tmakemefeelconfidentbythetimetheshowcame.IsatatthegatewhileIwatchedJoyceandherhorserunfastandfinishinfirstplace. Myturnfinallycame.Werantothefirstfence障碍物andjumpeditwithouttrouble.KnightthenflewoverthesecondthirdandfourthfenceslikeabirdandIturnedhimtowardsthefinishingline. Aswecrossedthefinishinglinethecrowdwasshockedintosilence.KnightandIhadbeatenJoyceandherbeautifulhorsebytwoseconds! Igotmuchmorethanablueribbonthatday.AttwelveIrealizedthatIcanbeawinnerifIwantsomethingverymuchandworkhardforit. 34.Theunderlinedexpressionshownthegatemostprobablymeans. A.toldhowtoenterthearena B.shownhowtomakethehorsebeautiful C.sadtoleavethecompetitionearly D.toldtoenterthespeedevents 35.Whywasthewriternotconfidentofsuccess? A.Hewasariderwithoutexperience. B.Hedidnotpracticeenough. C.Hebelievedhewasn'tpopularwiththecrowd. D.Hethoughthishorsewasn'tasgoodastheothers. 36.Whenthefinalracefinishednobodycheeredbecause. A.theaudiencedidn'tlikeKnight B.theywereallimpatient C.thewriterhadrunoutoftime D.thewinwasunexpected 37.Thebesttitleforthestoryis. A.ARacetoRemember B.AHorse'sStory C.MyTeenageLife D.ADifficultAge
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
湘公网安备 43130202000226号