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三个同种材料制成的实心圆柱，高度相同．甲的质量为2kg，乙的质量为2kg，丙的质量为8kg，把它们竖直放在水平地面上时，对地面的压强大小为（ ）A．甲最大 B．乙最大 C．丙最大 D．三者一样大
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用两种材料制成体积相同的甲乙两种实心小球在调好的天平左盘中放三个甲球在右盘上放两个乙球天平恰好平衡则
乙球的密度是甲球的1.5倍
甲球的密度是乙球的1.5倍
甲、乙两球的密度相等
每个甲球的质量是每个乙球的1.5倍
三个相同的杯子中各装有适量的水把质量相同的实心铜块铁块铝块依次放入甲乙丙三个杯中后水面高度相同则原来
有大小相等用不同材料制成的甲乙两实心球当天平的右盘放上两个甲球左盘放上三个乙球时天平恰好处于平衡状态
甲、乙两球的质量之比是3∶2
甲、乙两球的质量之比是2∶3
甲、乙两球的密度之比是3∶2
甲、乙两球的密度之比是2∶3
实心圆柱体甲和长方体乙分别放置在水平地面上甲的密度为0.6×104kg/m3质量为12kg底面积为4
有三个相同材料制成的圆柱体高度相同它们的质量比为m1:m2:m3=2:3:5把它们竖直放在水平面上则
2:3:5
5:3:2
1:1:1
15:10:6
由不同种物质构成的甲乙和丙三个物体甲乙两物体质量都为1kg丙物体的质量为2kg将三个物体的温度都升
乙和丙的比热容相等
甲的比热容是乙的2倍
丙的比热容是乙的2倍
甲．乙和丙的比热容都相同
把同种材料制成的甲乙两个实心正方体放在水平桌面上甲乙对桌面的压强分别为p1和p2把甲放在乙的上面如图
2013春•黄石期末在水平桌面上有三个竖直放置的同种物质制成的实心圆柱体已知它们的高度相等但质量不同
质量大的一定大
底面积大的一定大
底面积小的一定大
三个一样大
由同种材料制成的甲乙两个实心球质量之比是2:3则甲乙的密度比为
3:2
2:3
1:1
9:4
甲乙两个实心物体由同种材料制成的甲的体积是乙的体积的2倍则甲乙两物体的密度之比为质量之比为
三个用铜铁铝制成的实心圆柱体它们的质量相等高度相同已知铜的密度最大铝的密度最小现把它们都竖放在水平桌
铜柱最大
铁柱最大
铝柱最大
三个圆柱一样大
用两种材料制成体积相同的甲乙两种实心小球在调好的天平左盘中放三个甲球在右盘上放两个乙球天平恰好平衡则
乙球的密度是甲球的1.5倍
甲球的密度是乙球的1.5倍
甲、乙两球的密度相等
每个甲球的质量是每个乙球的1.5倍
两个用同种材料制成的体积相同的实心圆柱体其横截面积之比S.1∶S.2＝3∶1则它们的质量之比m1∶m
三个铜制的实心圆柱体质量分别为m甲=2kgm乙=3kgm丙=5kg其高度均为10cm把它们竖放在水
甲最大
乙最大
丙最大
一样大
三个相同的材料制成圆柱体高度相同甲重12牛乙重10牛丙重8牛把它们竖直放在水平地面上对地面产生的压
三个一样大
甲最大
乙最大
丙最大
甲乙两种物质的质量m与体积V.的关系如图所示.在水平桌面上竖直放置着由甲乙两种物质分别制成的相同高度
如图所示甲乙两个用同种材料制成的均匀实心正方体放在水平地面上可能使甲和乙对地面的压强相等的方法是
沿水平线截去质量相同的部分
沿水平线截去高度相同的部分
将质量相同的物体分别放在甲．乙的上面
分别以甲．乙物体上表面的面积大小加上相同高度的该种物质
同种材料制成的三个实心圆柱体都竖直放在水平桌面上若它们对桌面的压强相等则它们一定具有相同的
体积
质量
横截面积
高度
如图1是ab两种不同物质质量和体积的关系图象则ab两种物质密度之比为如果用质量相等的上述两种物质分别
在甲乙丙三个相同的容器中分别盛质量相同的同种液体将三个质量相同体积不同的小球分别沉入三个容器的底部当
甲
乙
丙
一样大
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30分WhenIsettledinChicagomynewcityseemedsobigandunfriendlyThenIhada1problemandhadtogotohospitalfora2examination. Itseemedasmall3comparedtotheoneIwasabouttofacebutthingsstartedtogo4rightfromthebeginningNothavingacaror5thecityIwasdependingonacoupleofbusestogetmefromAtoB6I'dleftmyselfplentyoftimesoonitwas7IwasgoingtobelateasIhadmistakenlyboardedabusthatwastakingmeinthe8direction. I9thebusandstoodonthepavementnotknowingwhattodoIlookedintotheeyesofa10whowastryingtogetpastme11insteadofmovingonshestoppedtoaskifIwas12AfterIexplainedmy13tohershepointedtoabusstopacrossthestreetwhereabuswouldtakemebackintothecitytomy14.SittingtherewaitingIfelt15thatsomeonehadbeenwillingtohelp.16hearingahorn喇叭nearbyIlookeduptoseeacarwithmynewfriend17atmetogetinShehadreturnedtooffermea18tothehospital. Suchunexpected19fromapasser﹣bywasalovelygifttoreceive.AsIclimbedoutofthecaratthehospitalandturnedtothankhershesmiledandtoldmenottolose20forallthingsarepossible. 1.A.physical B.traveling C.social D.housing 2.A.scientific B.final C.previous D.thorough彻底的 3.A.chance B.challenge C.success D.error 4.A.wrong B.easy C.fast D.ahead 5.A.leaving B.visiting C.knowing D.appreciating 6.A.Although B.Since C.Unless D.Once 7.A.strange B.necessary C.obvious D.important 8.A.same B.right C.general D.opposite 9.A.lookedat B.waitedfor C.gotoff D.raninto 10.A.driver B.friend C.stranger D.gentleman 11.A.Especially B.Surprisingly C.Probably D.Normally 12.A.nervous B.excited C.OK D.dangerous 13.A.idea B.motivation C.excuse D.situation 14.A.appointment B.apartment C.direction D.station 15.A.afraid B.grateful C.certain D.disappointed 16.A.Thus B.Then C.Perhaps D.Surely 17.A.staring B.laughing C.waving D.shouting 18.A.lift B.suggestion C.bike D.guidebook 19.A.results B.news C.kindness D.appearance 20.A.power B.faith C.touch D.support
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解方程
解方程x2+2x-10=0
已知X+Y3+Z﹣W2﹣是短周期元素XYZW形成的离子图中的甲乙丙均是由上述四种离子中的两种组成的化合物． 回答下列问题 1通常状况下Z的单质是一种黄绿色气体工业上常用电解溶液丙的方法制备该单质制备反应的离子方程式是 2①甲的化学式是乙的化学式可能是 ②若将溶液甲与溶液乙混合产生白色沉淀则该反应的离子方程式是．
下列说法不正确的是
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1分Wemust平衡hisgoodqualitiesagainsthisfaults.
用一块边长为60cm的正方形薄钢片制作成一个没有盖的长方体盒子可先在薄钢片的四个角上截去四个相同的小正方形如图①然后把四边折合起来如图②．当截去的小正方形的边长是多少厘米时做成的盒子的底面积为900cm2
8分LosAngelesiswell﹣knownfortrafficjamsandaggressivedrivers.DevonFitzgeraldacyclistisfamiliarwithboth. AlotofL.A.folksareinarush''hesaidanditisveryeasyforthemtoprioritize优先于theirspeedoveryoursafety. ThecityisknownforitscarculturebecauseLosAngelesisspreadoutandpublictransportationiseithersloworlimited.Asaresultpeopledriveeverywherecausingcongestion拥挤almostanytimeofday. ThereforeFitzgeraldlikestoridehisbicycletowork.IlikethefactthatitsimplifiesalotoftheaspectsoftravelFitzgeraldsaid.ForinstanceIdon'thavetoworryaboutparking. HoweverRogerRosaswhodrivessaysthatbicyclesaredangerousforthecyclistandthedriver.Youalwayshavetomakesurethatyoulooktotheothersidebecauseyouaregoingtododgethisguy.Youdon'twanttodoahit﹣and﹣runhesaid. TomakecyclingsafersomebicyclistsinLosAngeleswholiveandworkneareachotherarecyclingtoworktogetherinwhat'scalledaBikeTrains. Youareabigenoughgroupthatcarsdon'thavethesamebehaviorsasifyouarejustonepersonsaidNonaVarnadowhoco﹣foundedL.A.BikeTrains.Andyouarealsowithanexperiencedcyclist. L.A.BikeTrainswaslaunchedinMay2013andthenumberofparticipantsandroutesaroundthecityhasbeengrowing.Theroutesrangefrom7toalmost32kilometerslong.ThatmakesL.A.BikeTrainsuniquecomparedtoothercitiessaysHerbieHuffatransportationexpertatUniversityofCaliforniaLosAngeles. WewantpeopletodevelopthatmentalsenseofsecurityandconfidencebyridingtogetherinagroupNonaVarnadosaid.HeraimistomakeitsothatbiketrainsareanimportantpartofLosAngelesculture. 1.WhatdoweknowaboutthetransportationinLosAngelesfromthepassage? A.Peoplelackawarenessoftrafficsafety. B.Driversarequiterudetotheirpassengers. C.Alotoftrafficaccidentshappeneveryday. D.Theroadsareoftencrowdedwithcars. 2.WecanknowfromthepassagethatDevonFitzgerald A.sometimesdrivesfastinordernottobelateforwork B.preferstorideabikeinordertosavemoney C.thinksitlessworryingtogotoworkbybike D.issatisfiedwiththetransportationofLosAngeles 3.Theunderlinedworddodgeinthefifthparagraphmostprobablymeans. A.meet B.avoid C.annoy D.protect 4.AccordingtothepassagewhichoneisTrue? A.BikeTrainsisgettingmoreandmorepopularinL.A. B.BikeTrainshasbecomeanimportantpartofL.A.culture C.BikeTrainsislaunchedtoincreasepeople'strafficknowledge D.BikeTrainsmakescyclistsmoreconfidentintheirwork
8分JustfinishingloadinghiscarmyhusbandJerrywentbacktothekitchen.Iguessfillingmythermos保温瓶isallIhavelefttodoandthenI'moff.Downthedrainwentthehotwaterthathadbeenwarminghisthermos. Withanostalgic怀旧的lookonhisfacehesoftlysaid:AnytimeIfillmythermosIthinkofyourmom.Thetoneinhisvoicewassotenderashespokeofmymotherwhoissadlynolongerwithus. OhhoneyIknowshe'swatchingandlisteningrightnowwithabigsmileonherfaceIrespondedtearsinmyeyes. OnemorningyearsagowhenwewereleavingmotherwatchedasJerrywastofillhisthermos.MomthencasuallysaidJerryifyoufilledyourthermoswithhotwaterandletitsitawhileyourcoffeewouldstayhotforlongerthen.Withhersimplesuggestionhisfaceshowedthathewasshockedbyhisownlackofcommonsensewellofcourseitwould! Hepouredoutthesmallamountofcoffeealreadyinthethermosandrefilleditwithboilinghotwater.Thenhepouredthewaterandrefilleditwithhotcoffee.MomsmiledasJerrydidso. Wordsofwisdomfromalovingmother﹣in﹣lawmadeanimpactthatwillneverbeforgotten.Sheneverdreamedherwordswouldbeatreasuredandeverlastingmemoryintheheartofherson﹣in﹣law. Thelastingmemoriesdon'tnecessarilycomefrommajormomentsinlife.MemoriesareoftenmadeduringthosesmallordinarytimesLifeisaboutsmallmomentswesharewithfriendsandlovedones. 1.Whichwordbestdescribestheauthor'sfeelinginParagraph3? A.Confused B.Concerned C.Touched D.Interested 2.TheadvicethemothergaveJerrywasto. A.fillthethermoswithalittlecoffeefirst B.warmthethermosupbeforefillingitwithcoffee C.fillthermoswithcoffeebeforewithwarmwater. D.thinkofherwheneverfillingthethermoswithcoffee. 3.Theunderlinedpartdon'tnecessarilyissimilarinmeaningto. A.possiblybutuncertainly B.withoutanydoubt C.certainlyandabsolutely D.outofthequestion 4.Themessagethatthestoryintendstoconveyis. A.thatlastingmemoriescomefromsmallthings B.howvaluableamother'sadviceistoherchildren C.whatawisewomanthemotheristoherson﹣in﹣law D.whyweshouldrespectourparentsandlistentothem
6分Manypeopledon'trealizethatmosthealingherbs治疗草药makeuptoday'smodernmedicine.Thehealingherbsfromancientdaysarestillthehealingherbsofmoderntimes.Throughoutalloftheseyearsherbshavestayedunchanged;theirqualitystaysasstrongasancientmanandanimalsfoundittobethousandsofyearsago.Whathaschangedisthewaymanusesthesehealingherbstogetherwithmodernmedicineoftoday. Ancientmanknewabouttheadvantagesofhealingherbsandpassedonthisknowledgefromgenerationtogeneration.Todaytheknowledgeagesagodoesgoodtomodernman.Actuallyherbscanbeanyplantflowerortreethathealsthebody.Accordingtoearlywritingsmanfirstnoticedthatwhenananimalwasillitwouldbiteintospecificplantsotherwisetheanimalwouldleavethemalone. Watchinganimalsbehaviorsisstilldonetoday.TenyearsagoresearchersattheGombeNationalParkinTanzanianoticedchimpanzees黑猩猩thatwereillwereeatingAspilialeaves.ResearchersfoundthatAspilialeaveshadakindofantibiotic抗生素.Thesechimpanzeessurelyknewthisplantwouldhelphealtheirdisease.Someherbsmaskthesmellofsmellymeat.TheEgyptiansusedmanykindsofherbstopreservetheirdead. Inawordforthousandsofyearsherbswereusedformanypurposessuchaspreservingourfoodshealingourbodyandsoon.Theycancontinuetoplayanimportantpartinourlivesifweopenourmindstotheirimportanceandusefulness.Inmyopinionitisalwaysbettertotreatnaturallywithherbsthantotreatillnesseswithman﹣mademedicines.Therearefewifanysideeffectstotakeherbs. 1.TheexampleofChimpanzeesisusedtosuggest. A.chimpanzeesarecleveranimals B.manbeganstudyingherbslongago C.Aspilialeavescancuremanydiseases D.animalshelpedmandiscoverhealingherbs 2.AccordingtothetexttheEgyptiansusedherbs. A.tocookfood B.topreservetheirdead C.tofeedtheiranimals D.toprotecttheirbody 3.Whatisthewriter'sattitudetowardshealingherbs? A.Hethinkstheyareveryuseful. B.Herefusestoacceptthem. C.Hethinkstheyareuseless. D.Hethinkstheyhavelotsofsideeffects.
6分ChooseYourOne﹣DayTours TourA﹣Bath&StonchengeincludingentrancefeestotheancientRomanbathroomsandStonehenge﹣￡until26Marchand￡39thereafter. Visitthecitywithover2000yearsofhistoryandBathAbbeytheRoyalCrescentandtheCostumeMuseum.Stonehengeisoneoftheworld'smostfamousprehistoricmonumentsdatingbackover5000years. TourB﹣Oxford&StratfordincludingentrancefeestotheUniversityStMary'sChurchTowerandAnneHathaway'shouse一32until12Marchand36thereafter. Oxford:IncludesaguidedofEngland'soldestuniversitycityandcolleges.Lookoverthecityofdreamingspires尖顶formStMary'sChurchTower.Stratford:IncludesaguidedtourexploringmuchoftheShakespearewonder. TourC﹣WindsorCastle&HamptonCourtincludingentrancefeestoHamptonCourtPalace﹣﹣£34untilMarchand£37thereafter. IncludesaguidedtourofWindsorandHamptonCourtHenryMill'sfavouritepalace.FreetimetovisitWindsorCastleentrancefeesnotincluded.With500yearsofhistoryHamptonCourtwasoncethehomeoffourKingsandoneQueen.Nowthisformerroyalpalaceisopentothepublicasamajortouristattraction.Visitthepalaceanditsvarioushistoricgardenswhichincludethefamousmaze迷宫whereitiseasytogetlost! TourD﹣CambridgeincludingentrancefeestotheTowerofSaintMarytheGreat﹣£33.until18Marchand£37thereafter. IncludesaguidedtourofCambridgethefamousuniversitytownandthegardensofthe18thcentury. 33.WhichtourwillyouchooseifyouwanttoseeEngland'soldestuniversitycity? A.TourAB.TourBC.TourCD.TourD 34.Whichofthefollowingtourschargesthelowestfeeon17March? A.WindsorCastle&HamptonCourt. B.Oxford&Stratford C.Bath&Stonehenge. D.Cambridge. 35.WhyisHamptonCourtamajortouristattraction? A.Itusedtobethehomeofroyalfamilies. B.Itusedtobeawell﹣knownmaze C.ItistheoldestpalaceinBritain D.Itisaworld﹣famouscastle.
30分Wheredoyougowhenyouwanttolearnsomething?Afriend?Atutor?Theseareall41acesoflearning.Butitmaywellbethatthelearningyoureallywant42somewhereelseinstead.Ihadthe43ofseeingthisfirsthandona44. Mydaughterplaysonarecreationalsoccerteam.Theydidverywellthisseasonandso45atournamentwhichnormallywasonlyformoreskilledclubteams.Thisledtosome46experiencesonSaturdayastheyplayedagainstteams47trained.Throughthefirsttwogamesher48didnotgetonseriousshotongoal.AsapparentI49seeingmydaughterplayingherbest50stilldefeated. ITseemedthatsomethingclickedwiththe51betweenSaturdayandSunday.Whenthey52fortheirSundaygametheywere53different.Theyhadbegunintegrate融合thekindsofplayandteamworktheyhad54thedaybeforeintotheir55.Theyplayedaggressivelyand56scoredagoal. It57methatplayingagainsttheotherteamwasagreat58momentforallthegirlsontheteam.Ithinkitisageneralprinciple.59isthebestteacher.Thelessonstheymaynotbe60whattheywouldhavegotteninschool.Butarecertainlymorepersonalandmeaningfulbecausetheyhadtoworkthemoutontheirown. 41.A.public B.traditional C.official D.special 42.A.passes B.works C.lies D.ends 43.A.dream B.idea C.habit D.chance 44.A.trip B.holiday C.weekend D.square 45.A.won B.entered C.organized D.watched 46.A.painful B.strange C.common D.practical 47.A.less B.poorly C.newly D.better 48.A.fans B.tutors C.class D.team 49.A.imagined B.hated C.avoided D.missed 50.A.if B.or C.but D.as 51.A.girls B.parents C.coaches D.viewers 52.A.dressed B.showedup C.madeup D.planned 53.A.slightly B.hardly C.basically D.completely 54.A.seen B.known C.heard D.read 55.A.styles B.training C.game D.rules 56.A.even B.still C.seldom D.again 57.A.confused B.struck C.reminded D.warned 58.A.touching B.thinking C.encouraging D.learning 59.A.Experience B.Independence C.Curiosity D.Interest 60.A.harmfulto B.mixedwith C.differentfrom D.appliedto.
汽车尾气中含CONOx碳氢化合物等废气在汽车上安装三效催化转化器可使这些尾气生成无毒物质减少汽车尾气污染． 1已知ⅠN2g+O2g⇌2NOg△H＝+180.5kJ/mol Ⅱ2Cs+O2g⇌2COg△H＝﹣221.0kJ/mol ⅢCs+O2g⇌CO2g△H＝﹣393.5kJ/mol 则Ⅳ2NOg+2COg⇌N2g+2CO2g△H＝ 2反应Ⅳ△S0填“＞”“＜”或“＝”在填“高温”“低温”或“任何温度”下能自发进行 3如图1所示将NO和CO以一定的流速通过两种不同的催化剂进行反应Ⅳ相同时间内测量逸出气体中NO含量从而确定尾气脱氮率脱氮率即NO的转化率结果如图所示． 以下说法正确的是 A．第②种催化剂比第①种催化剂脱氮率高B．相同条件下改变压强对脱氮率没有影响 C．曲线①②最高点表示此时平衡转化率最高D．催化剂分别适用于55℃和75℃左右脱氮 4某研究小组在实验室用某新型催化剂对CONO催化转化进行研究相同时间内测得NO转化为N2的转化率随温度CO混存量的变化情况如图2所示． ①若不使用CO温度超过775℃发现NO的分解率降低其可能的原因为 ②在＝1的条件下应控制的最佳温度在左右． 5在某温度下2L密闭容器中充入NOCO各0.4mol进行反应Ⅳ测得NO物质的量变化如图3所示 5分钟末反应达到平衡该反应的平衡常数K＝第6分钟继续加入0.2molNO0.2molCO0.2molCO2和0.1molN2请在上图中画出到9分钟末反应达到平衡NO的物质的量随时间的变化曲线． 6NOx是大气污染物之一科学家们在尝试用更科学的方法将NOx脱氮转化成无毒的N2减少对大气的污染．下列物质可以作为脱氮剂的是 A．NH3B．CH4C．KMnO4D．尿素．
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