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如图所示，刻度均匀的轻质杠杆在水平位置平衡，则弹簧测力计的示数为 N，悬挂在A处的物体重 N
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在探究杠杆平衡条件的实验中保持杠杆在水平位置平衡就可以直接从杠杆上读出__________如图所示在
小明利用刻度均匀的轻质杠杆探究杠杆的平衡条件图每个钩码重O.5N当调节杠杆在水平衡后在A.点悬挂两个
在探究杠杆平衡条件的实验中保持杠杆在水平位置平衡就可以直接从杠杆上读出__________如图所示在
在探究杠杆平衡条件的实验中如果杠杆右侧高左侧低则可将左侧的平衡螺母向调节使其在水平位置平衡.如图所示
在探究杠杆平衡条件的实验中.1如图a所示要使杠杆在水平位置平衡可将杠杆左端的平衡螺母向调节.2如图b
用如图所示的装置做探究杠杆的平衡条件实验.1实验开始时杠杆的位置如图甲所示为使杠杆在水平位置平衡应将
如图所示在水平平衡的杆杆的A.点挂10的钩码用调好的弹簧测力计竖直向上拉杠杆的B.点是杠杆在水平位置
在探究杠杆平衡条件的实验中保持杠杆在水平位置平衡就可以直接从杠杆上读出▲.如图所示在支点左侧20cm
在探究杠杆平衡条件的实验中如果杠杆右侧高左侧低则可将左侧的平衡螺母向调节使其在水平位置平衡.如图所示
如图所示在探究杠杆平衡条件的实验中如果在杠杆支点左侧20cm刻度处挂3个重均为0.5N的钩码在支点右
如图所示是小明利用刻度均匀的匀质杠杆进行探究杠杆的平衡条件的实验每个钩码重为0.5N.1实验前将杠
在探究杠杆平衡条件的实验中如果杠杆右侧高左侧低则可将左侧的平衡螺母向调节选填左或右使其在水平位置平衡
用如图所示的装置做探究杠杆的平衡条件实验.1实验开始时杠杆的位置如图甲所示为使杠杆在水平位置平衡应将
在探究杠杆的平衡条件的实验中如果杠杆右侧高左侧低则可将左侧的平衡螺母向________调节使其在水平
在探究杠杆平衡条件的实验中如果杠杆右侧高左侧低则可将左侧的平衡螺母向调节使其在水平位置平衡.如图所示
在探究杠杆平衡条件的实验中保持杠杆在水平位置平衡就可以直接从杠杆上读出▲.如图所示在支点左侧20cm
在探究杠杆平衡条件的实验中如果杠杆右侧高左侧低则可将左侧的平衡螺母向调节使其在水平位置平衡.如图所示
在探究杠杆平衡条件的实验中如果杠杆右侧高左侧低则可将左侧的平衡螺母向调节选填左或右使其在水平位置平衡
如图所示在研究杠杆平衡条件的实验中在杠杆的左端悬挂一个物体右端用弹簧测力计拉着使杠杆在水平位置保持平
如图所示是探究杠杆的平衡条件的实验装置1实验前杠杆右端偏高应将两端的平衡螺母向右调节使杠杆在水平位置
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20分在李华18岁生日到来之际妈妈准备送他一份礼物并给了他三个选择kindle电子书生日旅行希望小学志愿者服务让他做出自己的决定.假如你是李华你会选择哪份礼物阐述你选择这份礼物的理由.
下列选项中关于水的说法正确的是
3分AvisittothevillageofKitaisaUganda TherearenotmanyvisitorstoKitaisaandnotmuchthatwouldbringthemthereunlesstheyknowsomeonelivingthere.Mostofthevillagersliveadistancefromthemainroadandwheretheylivearepathsthataredifficulttotravelespeciallyduringtherainyseasons. Thereareafewshopssellingoilsugarteaflourcandles.Thereisnopetrolstationbutonewillfindaschoolandasmallgovernmenthospital.Buttherearenodoctorsjustafewnursesandmedicallytrainedstaff. Itisstillearlyandmostpeopleareoutsidecookingtheirmealsoverfirewood.Childreninuniformandwithoutshoesaregoingtoschoolmakingtheirwaythroughmuddypathsfromthenight'srain. Youcanseesomeadultspickingbeansorcultivatingthegroundaroundcornplants.Somechildrenarecarryingwaterfromthenearbyriver.Peoplearesittingoutsidehavingbreakfast.Childrenwillhaveporridgethefamilywilleatleftoverposhoorplantainbananascalledmatoke.Meatisnotofteneatenproteincomesmostlyfrombeans. Herelifeistoughthereissimplyalackofeverything.SomechickensarerunningaroundandIamtoldthattheyarebasicallyforeggsthoughonewascaughtandgiventomeforlater.Lifehereisverysimple.Thereisnolibraryherenonewspapers.Therewasalittlerestaurantwithsomeoutsidechairsabeautyshopandabouteightplaceswherefoodandothersuppliesweresold. Peopleinvillagesdon'tlivelongforthemostpartsincethereisnoinfrastructurehere.Therearenoambulancesandifyoudogetsickthereisnomoneytopayfortreatment.Thenearesthospitalis15kilometresawayinBusunjubuteventhatlargertownlacksfacilitiesthoughamedicalclinicistherewithadoctorunlikethesmallfacilityinKitaisawhichhasfewthings. Otherobviousproblemsarewithwaterandsanitation.Watertakenfromcreeksshouldbeboiledandtreated.Itisnotandbecauseithastobecarriedfromadistanceitisusedsparingly.Childrenbecomeillwithdiseasesthatcouldbepreventedthroughtheuseofsoapandwater. Therearenojobsinthevillageexceptcultivatingyourgarden.Youcantrysellingfoodalongtheroadbutthereisnowaytomakemoney.Youlearntoliveonlittleandtomakeeveryshillingcount.Somesupportcomesfromrelativesandifyouvisitsomeoneinthevillageyoubringthosethingsthattheydonothaveandwhenyouleaveyouleavethemsomecash. VillagepeopleinUgandaarefriendlyandhospitable.Theyarekindandshowtheirgracefulwaystooutsiders.Kidshoveradultsgreetyouliketheyhaveknownyouforever. 69.WhatisthemostlikelyreasonforpeopletoKitaisa? A.Tovisitsomerelativesorfriends. B.Toenjoythebeautifulscenery. C.ToknowmoreaboutUganda. D.Tohelppeopleawayfromdiseases. 70.WhichofthefollowingwordscanNOTbeusedtodescribethelifeinKitaisa? A.Hard.B.Peaceful.C.Boring.D.Ideal. 71.Thewordinfrastructureparagraph6isclosestinmeaningto. A.enoughnutrition B.systemictransportation C.basicservices D.high﹣qualityeducation 72.Thepassagemainlytalksabouttheauthor's. A.expectationoftheunder﹣developingvillage B.experienceandfeelingsofthevisittothevillage C.suggestionsonthedevelopmentofthevillage D.descriptionofthebeautifulsceneryofthevillage.
的日常生活中“加碘食盐”“含氟牙膏”．这里的碘氟应理解为
经10余年技术攻关吉林大学科研团队研发出陆域“可燃冰”冷钻热采关键技术“可燃冰”[CH4H2On]是在海底的低温__条件下形成的外观像冰．下列关于“可燃冰”的叙述正确的是
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1平时所说的“天然水”是填物质类别． 2要推测水分子的构成需下列条件中填数字序号就可以达到目的． ①两级生成气体的体积比 ②氢分子的构成 ③氧分子的构成 ④气体体积比与分子个数比的关系 ⑤生成氢气和氧气的质量比．
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3分Gold Indiaistheworld'slargestmarketforgoldjewellery.InmuchofAsiatheMiddleEastandIndiaaroundtwo﹣thirdsofthejewellerypurchasedisusedasawayofsavingmoneyaswellasbeingwornasadecorativeitem.Theuseofjewelleryasawayofsavingmoneyisoftenimportantinruralareaswherefindingabankisdifficultorevenimpossible.Peoplebuygoldbecauseitsvaluestaysstrongevenwhenthevalueofmoneygoesdown. Goldjewelleryhasoftenbeenawoman'sonlyvaluablepossessionandinsomefamiliesthisisstilltrue.Awoman'sgoldcanthereforebeheronlyprotectionagainstpersonalmisfortune.Todayallaroundtheworldsalesofgoldjewelleryhavegrownbyover20%peryearbecauseeveryoneisconfidentthatgoldwon'tloseitsvalue.Demandforgoldissohighthatgoldminescannotsupplyenough. Gold'sfunctionasadecorationasjewelleryhasbeenevidentforthousandsofyears.Sincetheearliesttimesthebeautyandrichnessofgoldalongwiththefactthatitdoesnotchangeitscolourhasmeantthatithasalwaysbeenthefavouritemetalofjewellers.TheearliestgoldjewellerydatesfromtheSumeriancivilisationthatwasatitsmostpowerfularound6000yearsago.IntheMiddleAgesancientpeopleattemptedtomakegoldfromothermetals.Theyusedgoldinmedicinesdesignedtofightoldageandprolonglife. Goldalsoperformsimportantfunctionsinmanyaspectsofeverydaylife.Itdoesnotreactwhenitcomesintocontactwithothersubstancesandthisalongwithotheruniquepropertiesmakesitusefulinmedicineandmanyotherareasthatweconsideressentialtoourmodernlives. Duringheartsurgerygold﹣coveredstentareputintoblockedarteriestohelptheflowofblood.Thesegadgetsneedtobecarefullypositioned.GoldisidealforthisbecauseitshowsupclearlyonX﹣raysandcaneasilybelocatedbydoctors.Apacemakeradeviceinsertedinthebodytokeeptheheartbeatregularalsocontainsgold.Goldisusedinalloftheseapplicationsbecauseofitshighlevelofreliability.Goldalsohelpsdoctorstodeliverprecisedosesofpowerfuldrugstothepartsofthebodywheretheyarerequired. Goldhasmanyotherapplicationsinmodernlifeasitconductselectricityveryefficiently.Thestandardtouch﹣tonetelephonecontains33contactsmadefromgold.Air﹣bagsystemsfittedinmorethan30millioncarsaroundtheworldrelyongold﹣coatedelectricalcontacts.Andeverytimeyoutouchakeyonyourcomputeritstrikesagoldcircuitthatsendsyourcommandtothecomputer'smicroprocessor.Infactyouhaveprobablyneverrealisedhowmuchgoldthereisinyoureverydaylife. NoteAnswerthequestionsorcompletethestatementsinNOMORETHANTENWORDS. 78.Comparedwithmoneypeopleprefersgoldbecauseof. 79.Goldwereusedinmedicinesbecauseancientpeoplebelieveditcould. 80.Whycangoldbeusedinpacemaker? 81.Whatmakestheapplicationofgoldinelectronicproductspossible?.
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3分Theelectricrevolution Themainreasonswhyelectriccarsarenotmorepopularatpresentaretheirpriceandtheirrelativelysmallrange. Existingbatterysystemsonlyallowelectriccars33traveladistanceofbetween100and160km.Howeverthisdistancemaynotbeaproblemforurbandrivers.ArecentSydneystudyreportedthat70percentofjourneyswere30kmorlessandrecentdatafromtheUSsuggeststhat77percentoftrips34takethereare48kmorless. AninnovativecompanycalledBetterPlaceisaimingtomakeelectriccarsanoptionforalldrivers.Itwantstoseeexistingvehiclesreplacedbyelectricvehicleswhichitsaysofferanumberofbenefits.Firstlytheycanbepoweredbyrenewableenergywhichproduceszeroemissions.35ismoreimportantisthatelectricmotorsaremoreefficientandcanconvertmorethan90percentofpowerintomovement.36achieveitsaimBetterPlaceplanstousetechnologyalreadyavailable. Theplanissimplebutrevolutionary.Itstartswiththeinstallationofahomechargepointandthroughthisthevehiclewillbepluggedintotheelectricitychargepointwheneveritisinthegaragetypicallyatnight.Inthemorningwithafullychargedbatterythecariscapableofasmuchas160kminurbanmotoringconditions.37thehomechargepointthebatterycanbetoppedupbychargepointsatworkandatsupermarkets. 38batteryislinkedtoacontrolcentrebysmarttechnologyinsidethevehicle.BetterPlacecanthenensurethatthecarischargedwithelectricityfromrenewablesourcesatthecheapestprice.For39longtripsanavigationsystemdirectsthedrivertothenearestswitchstation40thebatterycanbereplacedwithachargedonebyarobotwithinacoupleofminutes.
对比是学习化学的重要方法下列关于CO2与CO的比较错误的是
向一定量硫酸和硫酸铜的混合溶液中逐滴加入一定质量分数的氢氧化钠溶液直至过量．某同学依据实验事实绘制了如图所示的曲线．下列说法正确的是
3分调查显示非洲孩子们梦想能获得干净的引用水免费的教育以及平等的权利.access .
将一定量的锌粉加入到硫酸亚铁硫酸铜和硫酸镁的混合溶液中过一段时间后过滤向滤渣中加入稀盐酸有气泡产生．关于该实验有以下说法 ①滤渣中一定含有锌 ②滤渣中一定含有铜可能含有锌 ③向滤渣中加入稀盐酸最后溶液一定变成浅绿色 ④滤液中溶质一定含有硫酸锌和硫酸镁 ⑤滤液的颜色不可能为浅绿色 以上说法中正确的个数是
取10.9g纯碱样品含少量氯化钠杂质完全溶于108.8g水中再向其中逐滴加入一定质量的氯化钡溶液恰好完全反应过滤得到滤渣19.7g和不饱和溶液200g．化学方程式Na2CO3+BaCl2＝BaCO3↓+2NaCl计算 1样品中氯化钠的质量． 2所加氯化钡溶液溶质的质量分数
根据下列装置结合所学化学知识回答下列问题 1写出图中标号仪器的名称①② 2实验室制取少量二氧化碳时发生装置和收集装置最好选用填字母下同如需随时控制反应速率并节约药品发生装置最好选用 3实验室用高锰酸钾制取氧气时其反应的化学方程式为． 4如用F装置收集氧气判断氧气是否收集满的方法是．
元素周期表是学习和研究化学的重要工具请分析图中的信息回答有关问题． 1写出14号与9号元素组成化合物的化学式 2请根据图2推断碘元素在周期表中位于第周期 3图1中的元素填元素名称与图2元素的化学性质相似 4如图是某反应的微观示意图写出化学方程式 5活氧彩漂”可用于漂洗衣物杀菌消毒等原因是其有效成分过氧化氢分子中含有“过氧基”﹣O﹣O﹣．据此推测下列物质中可用作杀菌消毒剂的是填序号 A．H﹣O﹣HB．C．O＝C＝OD．
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请结合如图回答问题． 1实验室选用AD装置制取O2气体收集完毕后的一步关键操作是． 2实验室可用NH42SO4固体和熟石灰混合加热制取NH3应选择的发生装置为填编号． 3选择发生装置B和收集装置C可以用于实验室制取CO2若将发生装置由B改为F其优点是． ①为了得到纯净干燥的CO2除杂装置见图2导管按气流方向连接的顺序是填字母． a.1→2→4→3b.2→1→3→4c.4→3→1→2d.3→4→2→1 ②用化学反应方程式表示饱和NaHCO3溶液的作用．
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ABC三种固体物质均不含结晶水的溶解度曲线． 1A中混有少量的B是可用方法提纯． 2t2℃时A物质的饱和溶液为了进一步提高该溶液溶质质量分数可进行的操作是． 3对于溶解度曲线上的点p以下描述一定正确的是． aABC溶液的溶质质量分数相同bC的溶液100g有10g溶质cB溶液处于不饱和状态dAC溶液质量相等
某纯碱样品中含有少量氯化钠．为测定样品中碳酸钠的质量分数现称取该样品11g加入到盛有50g稀盐酸的烧杯中恰好完全反应最后称得烧杯中溶液的质量为56.6g．计算 1纯碱样品中碳酸钠的质量分数 2反应后所得溶液的溶质质量分数．
根据图中提供的信息请回答下列问题 1硅原子的电子数为 2BCDE中属于不稳定结构的有 3图中元素化学性质相似是 4CE两种元素组成化合物的化学式为．
3分他明年将实施的计划包括健身运动参加考试和面试出国留学以及去欧洲旅游.carry .
下列化学实验中能达到预期实验结果的是
以下归纳和总结完全正确的一组是
3分Thebestjobintheworld? Chocolateconsultant Thiscouldwellbethebestjobforanyonewitheventhe51passionforchocolate﹣andyesjobslikethesereallydoexist.Therearelotsofdifferenttypesofchocolateconsultant.LouiseThomashasworkedinthechocolateindustryfortwoyearsandhasbeen52aboutchocolate.Shebecame53bythelackofeducationandawarenessregardingfinechocolatesostartedherowncompanytoshareherloveofthecocoabean.Shenowrunstastingstofindan54chocolateforeverycustomerortoextendtheirrange.Ifyoudon'tyethavewhatittakestobeachocolateconsultantyoucanstillworkwithchocolateasapastrychef. LEGO55 Whohasn'tatsomepointintheirlifesatdowninfrontofaboxofLegoand56buildingorhelpingsomeoneelsetobuildafantasticcreationinmulti﹣colouredblocks?Forsomepeoplethisbecomesmorethanjustsomethingyoudidasakid.Legohasanumberof57whoworkwiththecompanytocreatesetsandbuildmodelsforthem.TheyworkagainstfairlytightbudgetsandthematicrestrictionsandarebasedinLegolandDiscoveryCentresaroundtheworld.Howevercompetitionforthejobsis58withestimatesvaryingastoexactlyhowmanythereareintheworld﹣from9to30.Thelatestonetogetajobwas23﹣year﹣oldAndrewJohnsonandthencompetedinatoughthree﹣roundbuild﹣off5945othercompetitors.Ifyoulovechildhoodtoysbutdon'tfancybuildingthemwhynotconsiderworkinginatoyshop? Sharktankcleaner Windowcleaningisprobablynotthemostfunofprofessions.Howeveraddintherequirementtoshareyourjobwithalotofsharkswhilesimultaneously同时地60byacrowdofpeopleallofwhomarenodoubtsecretlyhopingatleastoneofthesharksisfeelingalittlehungryandsuddenlythe61levelsriseupalevelortwo.Howeverifyouwanttoworkwithfishperhapsthejobwouldbeagoodchoice. Professionalsleeper 62you'readdictedtoyouralarmo'clockorspendalldayatyourdeskyawninganddrinkingcupsofcoffeetostayawakethenmaybeyoushouldconsiderturningyourcommentsintoaprofitablecareer.Believeitornotyoucanactuallygetpaidtowearthepajamas.63theseprofessionalsleepersparticipateinalotofuniversitystudiesonsleepordreamsetc.todecidewhetherthebedsarecomfortableornot.In2009duringanartshowatTheNewMuseumofContemporaryArtinNewYorkwomenwerepaidtosleepaspartofalivingartexhibitionsoyouneverknow64youcouldbeaskedtorestyourheadnext.Ifyouenjoyyoursleepyouprobablywantto65jobsthatleadtosleepwithdrawal. 51.A.greatest B.blind C.smallest D.intense 52.A.worried B.curious C.scared D.passionate 53.A.lost B.frustrated C.enthusiastic D.inferior 54.A.particular B.biggest C.sweet D.bitter 55.A.examiner B.seller C.competitor D.builder 56.A.takenup B.setabout C.givenoff D.gotin 57.A.professionals B.bosses C.purchasers D.competitors 58.A.fierce B.open C.fair D.international 59.A.cooperatingwith B.beating C.discussingwith D.encouraging 60.A.warned B.helped C.watched D.admired 61.A.difficulty B.interest C.income D.profit 62.A.Although B.Because C.If D.Unless 63.A.Rarely B.Contrarily C.Consequently D.Typically 64.A.why B.howlong C.where D.howoften 65.A.avoid B.accept C.create D.offer
离高考大约还有三个月的时间同学们都在积极有效地开展复习工作.请你谈谈你最后阶段3月﹣5月的复习计划以及制定该计划的思考或缘由. 写作内容必须包括以下两点 1未来一段时间内具体的复习计划 2制定该计划的原因分析.
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