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如图所示，人造卫星沿桶圆形轨道绕地球运行，当卫星从远地点向近地点运动时（ ）
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我国在太空航天领域处于世界领先水平如图所示是我国近期发射的一颗北斗导航卫星它沿椭圆轨道绕地球运行离地
卫星从远地点运行到近地点，势能减小，动能增大，速度增大
卫星从远地点运行到近地点，势能减小，动能减小，速度减小
卫星从近地点运行到远地点，势能增大，动能增大，速度增大
卫星从近地点运行到远地点，势能增大，动能增大，速度减小
如图所示人造卫星沿椭圆形轨道绕地球运行当卫星从远地点向近地点运动过程中下列说法正确的是
动能逐渐增大，机械能增大
势能逐渐减小，机械能减小
动能逐渐增大，势能逐渐减小，机械能不变
动能逐渐增大，势能逐渐减小，机械能减小
人造地球卫星在大气层外绕地球运转它的速度很大一天可以绕地球飞行几圈到十几圈能够迅速获取大量的信息.它
人造卫星沿椭圆轨道绕地球运行离地球最近的一点叫近地点最远的一点叫远地点卫星运行过程中机械能守恒.当卫
如上图丙是卫星的轨道示意图人造卫星沿椭圆轨道绕地球运行时离地球最近的一点叫近地点最远的一点叫远地点卫
人造卫星沿椭圆轨道绕地球运行当它由近地点向远地点运行时卫星的动能卫星的势能均选填增大减小不变
如图所示是卫星的轨道示意图.人造卫星沿椭圆轨道绕地球运行时离地球最近的一点叫近地点最远的一点叫远地点
如图所示人造卫星沿椭圆形轨道绕地球运行当卫星从远地点向近地点运动过程中下列说法正确的是
动能逐渐增大，机械能增大
势能逐渐减小，机械能减小
动能逐渐增大，势能逐渐减小，机械能不变
动能逐渐增大，势能逐渐减小，机械能减小
如右图所示是卫星的轨道示意图人造卫星沿椭圆轨道绕地球运行离地球最近的一点叫近地点最远的一点叫远地点卫
人造卫星沿椭圆轨道绕地球运行如图所示．当卫星从近地点向远地点运动时它的
速度增大
势能减小
势能增大
机械能增大
人造卫星沿椭圆轨道绕地球运行如图所示．当卫星从近地点向远地点运动时它的
速度增大
势能减小
势能增大
机械能增大
人造卫星沿椭圆轨道绕地球运行当它由近地点向远地点运行时卫星的动能卫星的势能填增大减小不变．
如图所示人造卫星沿椭圆形轨道绕地球运行当卫星从远地点向近地点运动过程中下列说法正确的是
动能逐渐增大，机械能增大
势能逐渐减小，机械能减小
动能逐渐增大，势能逐渐减小，机械能不变
动能逐渐增大，势能逐渐减小，机械能减小
人造卫星沿椭圆轨道绕地球运行当它由近地点向远地点运行时卫星的动能选填增大减小不变卫星的势能选填增大减
如图所示是卫星的轨道示意图人造卫星沿椭圆轨道绕地球运行时离地球最近的一点叫近地点最远的一点叫远地点卫
人造卫星沿椭圆轨道绕地球运行如图所示为卫星从远地点向近地点运动的过程针对该过程以下说法正确的是
动能逐渐增大，机械能增大
势能逐渐减小，机械能减小
动能逐渐增大，势能逐渐减小，机械能不变
动能逐渐增大，势能逐渐减小，机械能减小
人造卫星沿椭圆轨道绕地球运行如图所示为卫星从远地点向近地点运动的过程.针对该过程以下说法正确的是
动能逐渐增大，机械能增大
势能逐渐减小，机械能减小
动能逐渐增大，势能逐渐减小，机械能不变
动能逐渐增大，势能逐渐减小，机械能减小
如图所示是卫星的轨道示意图．人造卫星沿椭圆轨道绕地球运行时离地球最近的一点叫近地点最远的一点叫远地
如图所示人造卫星沿椭圆形轨道绕地球运行．请你画出卫星在远地点所受到的重力G．
人造卫星绕地球沿椭圆轨道运行如图所示近地点为离地球中心最近的点远地点为离地球中心最远的点．下列说法正
在近地点时，卫星势能最大
在远地点时，卫星动能最大
卫星从近地点向远地点运动的过程中，势能转化为动能
卫星从远地点向近地点运动的过程中，势能转化为动能
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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
洁厕剂含有盐酸与84消毒液混合发生如下反应NaClO+2HCl＝X+H2O+Cl2↑对人体造成伤害．下列说法不正确的是
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．
简直难以描述我当时激动的心情.Hardly.
下列说法中正确的是
某化学反应的微观过程如下图则下列说法中不合理的是
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?.
下列实验现象的描述正确的是
3分Theelectricrevolution Themainreasonswhyelectriccarsarenotmorepopularatpresentaretheirpriceandtheirrelativelysmallrange. Existingbatterysystemsonlyallowelectriccars33traveladistanceofbetween100and160km.Howeverthisdistancemaynotbeaproblemforurbandrivers.ArecentSydneystudyreportedthat70percentofjourneyswere30kmorlessandrecentdatafromtheUSsuggeststhat77percentoftrips34takethereare48kmorless. AninnovativecompanycalledBetterPlaceisaimingtomakeelectriccarsanoptionforalldrivers.Itwantstoseeexistingvehiclesreplacedbyelectricvehicleswhichitsaysofferanumberofbenefits.Firstlytheycanbepoweredbyrenewableenergywhichproduceszeroemissions.35ismoreimportantisthatelectricmotorsaremoreefficientandcanconvertmorethan90percentofpowerintomovement.36achieveitsaimBetterPlaceplanstousetechnologyalreadyavailable. Theplanissimplebutrevolutionary.Itstartswiththeinstallationofahomechargepointandthroughthisthevehiclewillbepluggedintotheelectricitychargepointwheneveritisinthegaragetypicallyatnight.Inthemorningwithafullychargedbatterythecariscapableofasmuchas160kminurbanmotoringconditions.37thehomechargepointthebatterycanbetoppedupbychargepointsatworkandatsupermarkets. 38batteryislinkedtoacontrolcentrebysmarttechnologyinsidethevehicle.BetterPlacecanthenensurethatthecarischargedwithelectricityfromrenewablesourcesatthecheapestprice.For39longtripsanavigationsystemdirectsthedrivertothenearestswitchstation40thebatterycanbereplacedwithachargedonebyarobotwithinacoupleofminutes.
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．
这个演讲旨在鼓励年轻人学会以积极的方式面对生活中遭遇的困难.intend.
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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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
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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
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