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下列四个几何体中，是三棱柱的为（ ）
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下面四个几何体中主视图左视图俯视图是全等图形的几何图形是
圆柱
圆锥
三棱柱
正方体
一个几何体的正视图为一个三角形则这个几何体可能是下列几何体中的________填入所有可能的几何体前
一个几何体的表面展开图如图所示则这个几何体是
四棱锥
四棱柱
三棱锥
三棱柱
一个几何体的正视图为一个三角形则这个几何体可能是下列几何体中的______填入所有可能的几何体前的编
下列四个几何体中主视图左视图与俯视图是全等图形的几何体是
球
圆柱
三棱柱
圆锥
下列四个几何体中是三棱柱的为
如图⑴⑵⑶⑷为四个几何体的三视图根据三视图可以判断这四个几何体依次分别为
三棱台、三棱柱、圆锥、圆台
三棱台、三棱锥、圆锥、圆台
三棱柱、正四棱锥、圆锥、圆台
三棱柱、三棱台、圆锥、圆台
一个几何体的正视图为一个三角形则这个几何体可能是下列几何体中的__________填入所有可能的几
如图⑴⑵⑶⑷为四个几何体的三视图根据三视图可以判断这四个几何体依次分别为
三棱台、三棱柱、圆锥、圆台
三棱台、三棱锥、圆锥、圆台
三棱柱、正四棱锥、圆锥、圆台
三棱柱、三棱台、圆锥、圆台
下列各组几何体中是多面体的一组是
三棱柱 四棱台 球 圆锥
三棱柱 四棱台 正方体 圆台
三棱柱 四棱台 正方体 六棱锥
圆锥 圆台 球 半球
下列四个几何体中主视图左视图与俯视图是全等形的几何体是
球
圆柱
三棱柱
圆锥
一个几何体的正视图为一个三角形则这个几何体可能是下列几何体中的____________填入所有可能
如图网格纸的各小格都是正方形粗线画出的是一个几何体的三视图则这个几何体是
三棱锥
三棱柱
四棱锥
四棱柱
下列四个几何体中主视图左视图与俯视图是全等图形的几何体是
球
圆柱
三棱柱
圆锥
下列四个几何体中主视图左视图俯视图完全相同的是
圆锥
球
圆柱
三棱柱
如图1234为四个几何体的三视图根据三视图可以判断这四个几何体依次分别为.
三棱台、三棱柱、圆锥、圆台
三棱台、三棱锥、圆锥、圆台
三棱柱、四棱锥、圆锥、圆台
三棱柱、三棱台、圆锥、圆台
一个几何体的展开图如图所示这个几何本是
三棱柱
三棱锥
四棱柱
四棱锥
一个几何体的表面展开图如图所示则这个几何体是
四棱锥
四棱柱
三棱锥
三棱柱
如图四个几何体分别为长方体圆柱体球体和三棱柱这四个几何体中有三个的某一种视图都是同一种几何图形则另一
长方体
圆柱体
球体
三棱柱
如图四个几何体分别为球体圆柱体长方体和三棱柱这四个几何体中有三个的某一种视图都是同一种几何图形则另一
球体
圆柱体
长方体
三棱体
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Three﹣quartersoftheworld'scoffeefannsdestroyforesthabitattogrowcoffeeinthesunandtypicallyuseharmfulpesticides[杀虫剂andchemicalsthatpoisontheenvironment.Whenforestsdisappearmigratory迁徙的songbirdsdisappeartoo.InordertodealwithseverepopulationandhabitatlossSmithsonianscientistscreatedtheBirdFriendlycertification・ BirdFriendlycoffeesareshade﹣grownmeaningthecoffeeisplantedundertreesratherthanonthelandthathasbeenclearedofallotherplants.Coffeeexpertssayshade﹣growncoffeestastebetterbecausethebeansripenslowerthancoffeegrowninthefullsunresultinginarichermorecomplexflavor.BirdFriendlycertifiedcoffeesgrowunderbio﹣diverseshadethatprovideshabitatformigratorysongbirdsandotherwildlifestorescarbonandfightsclimatechange.BirdFriendlycoffeesarealsocertifiedorganicmeaningtheyaregrownwithoutpesticideswhichisbetterforpeopleandfortheplanet. BirdFriendlyproducerscanalsoearnmorefortheircrops.Thewoodandfruittreesonshadecoffeefarmsprovidefannerswithadditionalincome.EverycupofBirdFriendlycoffeepurchasedrewardsthesefarmerswithalittlemoremoneyforbeinggoodstewardsoflheenvironmentandencouragesthemtocontinueconservingBirdFriendlyhabitat. BuyingBiniFriendlysupportstheSmithsonianMigratoryBirdCenter'sconservationresearchaimedalunderstandingandprotectingyourfeatheredfriends.YoucanpurchaseBirdFriendlycertifiedcoffeesuroundtheworldandprotectwildlifeandhabitatwitheverycup.Findastoreorcafenearyouorbetteryethaveitshippedtoyourdoorwhenyouorderonline. 1Whatisthepresentsituationofcoffeefarms? A.Onefourthofthemhavedestroyedforesthabitatforbirds. B.Pesticidesandchemicalsusedonthempoisonedmanybirds. C.Fannershavebeenawareofenvironmentprotection. D.Scientistspayattentiontothemandhavecomeupwithanidea. 2Whit'sacharacteristicofBirdFriendlycoffees? A.Theymayhaveabettertaste. B.Theyhaveastrangeflavor. C.Theytakelesstimetoripen. D.Theyaregrownonunpollutedland. 3HowcanBirdFriendlyfannersearnmoremoney? A.Bychargingconsumersmoremoney. B.Bysellingfruitsandwoodfromtrees. C.Bycuttingdowntreesandsellingwood. D.Byservingasstewardsofcoffeeconsumers. 4Whatdocsthetextsuggestcoffeeconsumersdo? A.Consumelesscoffee. B.Ordercoffeeonline. C.Purchaseshade﹣growncoffee. D.Donatetocoffeefarmers.
Fromsmoothconferencecallsina1crowdtrainstationtolivebroadcastsoftownhallmeetingsandlightning﹣quickdownloadsofhigh﹣resolution高清晰的2movieShanghai'ssuperfast5Gnetworkisturningtechnologicaldreamsintoreality. Inthelatest3develop.thecity'sHongqiaoRailwayStationoneofAsia's4bigtrafficcentershaslauncheda5Gnetwork.Itwillallowpassengerstoexperiencedataspeedsupto100timesfasterthan5isavailablenow.Therailwaystation's5GnetworktheresultofteamingupwithtelecommunicationequipmentmakerHuaweiTechnologies6seeasamilestoneinShanghai'scommercial5Garrangementtobecomeadual﹣gigabandcitywithgigabit千兆宽带networkspeedsonmobileaswellasfixednetworks. Asthe5Gera7approachoneofthekeyconcernsfortelecomoperatorswillbehowtheycanuse5Gnetworkstomeettheneedsofhigh﹣densityareaswiththousandsofpeoplesimultaneously同时using8networktomakephonecallsaccesstheinternetandmakemobilepayments. ChinaMobile'sShanghaibranchtappedHuawei's5GDigitalIndoorSystem9iscurrentlytheindustry'sonly10commercialavailablesystemfor5Gindoorcoverage.TheproductdevelopedinShanghaiisnowreadyformassdelivery.
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如图所示材料相同的物体mlm2由轻绳连接在恒定拉力F的作用下沿斜面向上加速运动．轻绳拉力的大小
Haveyoueverhadasummerjob?Thosewhohavethetimetocapitaliseonthefunsummerhastooffermaynothavethefundstodoso.Thesolution?Asummerjob. Theconceptofcash﹣strapped缺钱的studentsoverthesummerperiodisnotanewone.1Vacancies空缺canrangefromrolesasordinaryasfrycooktoseasonalworkatathemeparkoracushyjobwithcomfortableconditions.Inmanycasesthejobsonlypayminimumwagewhichmayonlytideyouover.2 Summerjobsprepareyoungpeopleforsuccessfulcareersinlaterlifeteachingvital'softskills'.saysUKWorkandPensionssecretaryEsterMcVeyintheDailyMail.IndeedwhentalkingabouttheirexperiencesofsummerjobspeopleaskedforaBBCNewsarticlesaidtheygotinvaluabletrainingandlearntskillssuchaspunctualitytoleranceandtheimportanceofhardwork.3TheUKgovernmenthasplaced20000summerjobvacanciesonitsFindaJobWebsite. 4Thepercentageofyoungpeopleworkingwhilestudyinghasmorethanhalvedsince1997fallingfrom42%to18%in2014.EsterMcVeybelievesthisisbecauseyoungpeoplearechoosingtofocusmoreoneducationratherthanearningextramoney.5.Itisn'talwayseasytogetajobas20﹣year﹣oldLibertyO'HaganastudentfromWorthingfound.Nottomentionbyworkingallsummeryoumayfeelyouhavemissedoutontheexperiencesandopportunitiesyourfriendshavehad﹣travellingandhavingfun. A.Butthatisn'ttheonlyproblem. B.Asummerjobmaynotbeadreamjob. C.Thismovecomesatatimeofapparentneed. D.Theseopportunitiesarethoughttobeveryimportant. E.Butthemoneyisnottheonlythingthat'sgained. F.Andthereareopportunitiesoutthereforthosewhowanttoearn. G.summerisaheadyperiodwhereeducationstopsandfunbegins.
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下列五幅图分别对应五种说法其中正确的是
假定你是学校英语报的兼职编辑李华.最近该报开设了YourFeelings专栏column.请用英语写一篇短文介绍开设该专栏的目的交流情感专栏内容有关心理健康的文章及解答心理问题并号召同学们投稿. 注意 1.词数100左右 2.可适当增加细节以使行文连贯.
关于近代物理知识下列说法正确的是
一列简谐横波沿x轴正方向传播在t＝0和t＝0.20s时的波形分别如图中实线和虚线所示．已知该波的周期T＞0.20s．下列说法正确的是
Imagineafuturewhereallfarmingisdonebymachineandhumansneversetfootinthefields.InShropshireintheUKengineersintheHandsFreeHectareprojectaredevelopingautomatedtractorsanddronestogrowandharvestcrops.Andtheirexperimentisnotaloneagriculturalroboticsisaboomingsector行业. Onereasonwhythesectorisontheupisthatglobaldemandforfoodisrapidlyincreasing.TheWorldBankestimateswewillneedtoproduce50%morefoodby2050iftheplanet'spopulationcontinuestogrowatitscurrentspeed.Addtothistotheforecastthatyields产量willdecreasebyoveraquarterduetoclimatechangeandthesituationlooksserious.Couldfuturisticfarmingprovidetheanswer? OnecompanyinJapanbelievesso.ThefirmSpreadhasdispensedwithfarmingonlandaltogetherandinsteadgrowsvegetablesonstacksoftraysindoorsinanautomatedfactory.IncountrieslikeJapanwherelandisactuallyaveryscarceresourceitmakesmoresensetostackyourproductionjustlikeaskyscrapersaysJJPriceSpread'sglobalmarketmanager.Mr.PricetoldtheBBCthatthismethodofvertical垂直的farmingnotonlyreducescostsby50%butitisalsogreener.LEDlightscutenergybillsbyathirdand98%ofwatercanberecycled.Bygrowingcropsclosetowherepeopleconsumethemtransportcostsandemissionsarealsominimisedhesays. Andwherewillwebuythisfuturisticfood?Perhapsinshopswithnostaff?AmazonhasrecentlylauncheditsfirstAmazonGostoreintheUSwhichhasnocheckouts.Customerssimplypicktheiritemsfromtheshelvesandtechnologydoestherest. Allthisbegsthequestionifeverythingisautomatedwhatjobswillpeopledo?Themechanisationoffarmingmeansfewerandfewerpeopleworktheland.From1950to2010agriculturallabourershavedecreasedfrom81%to48.2%oftheworkforceindevelopingcountriesandfrom35%to4.2%indevelopedcountries.It'satrendthatlookssettocontinue. 1Whydopeopledevelopagriculturalrobotics? A.Tochangetheclimate. B.Toliberatetheworkforce. C.Tocontrolthepopulationgrowth. D.Tomeettheincreasingdemandforfood. 2Whichofthefollowingisclosestinmeaningtotheunderlinedwordsinparagraph3? A.changed B.developed C.doneawaywith D.takenup 3WhydoesMr.PricethinkverticalfarmingmakesparticularsenseinJapan? A.Workforceistoolimited. B.Transportcostmaydecrease. C.Thereissolittlelandavailableforfarming. D.Thetechnologyhasreachedahighlevel. 4Whatcanbethebesttitleforthetext? A.Farmingtechnology B.Thefutureoffoodproduction C.Employmenttrend D.Futureshopswithnostaff
如图甲所示质量均为m＝0.5kg的相同物块P和Q可视为质点分别静止在水平地面上AC两点P在按图乙所示随时间变化的水平力F作用下由静止开始向右运动3s末撤去力F此时P运动到B点之后继续滑行并与Q发生弹性碰撞已知BC两点间的距离为L＝3.75mPQ与地面间的动摩擦因数均为μ＝0.2取g＝10m/s2求 1P到达B点时的速度大小v及其与Q碰撞前瞬间的速度大小v1 2Q运动的时间t．
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质谱仪是一种测量带电粒子质量和分析同位素的重要工具它的构造原理如图离子源A产生电荷量相同而质量不同的离子束初速度可视为零从狭缝S1进入电场经电压为U的加速电场加速后再通过狭缝S2从小孔垂直MN射入圆形匀强磁场．该匀强磁场的磁感应强度为B方向垂直于纸面向外半径为R磁场边界与直线MN相切E为切点．离子离开磁场最终到达感光底片MN上设离子电荷量为q到达感光底片上的点与E点的距离为x不计重力可以判断
假如你是李华五月份去美国参加国际文化周你的美国笔友Tom来信询问你赴美相关事宜.请你写一封回信内容包括 1.活动时间地点 2.活动的内容 3.其他个人安排. 注意 1.词数100左右. 2.可适当增加细节以使行文连贯. 参考词汇InternationalCultureweek国际文化周
假如你是校学生会__李华暑期拟组织部分学生去英国进行为期一周的研学游travelstudy活动已起草了活动方案.给你的英国网友Mr.Smith写信征求他对方案的意见及建议并询问相关注意事项. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
质量均为m＝lkg的甲乙两个物体同时从同地沿同一方向做直线运动二者的动能随位移的变化图象如图所示．下列说法正确的是
如图所示电源电动势为E内阴为r．电路中的R1为光敏电阻其阻值光照强度增大而减小R2为定值电阻．当开关S闭合时下列说法正确的是
InastudyrecentlypublishedinthejournalNeuronresearchersfoundthatsupermemorizersdonthaveunusuallylargebrainregionsthatallowthemtorememberalotofinformation.1Hereareafewoftheirfavoritetricksthatcanhelpyoutorememberthingsinyoureverydaylife. ToRememberNewwords TechniqueChangeroutine Inastudyagroupofstudentsstudiedalistofwordsintwoseparatesessions.Somestudiedinamessyroomandsomeinaneatspace.Onegroupofstudentsspentbothsessionsinthesameroomwhiletheothersplitthesessionsbetweenthetwoenvironments.Duringatestthestudentswhostudiedinmultipleplacesrememberedmuchmore.2Thatincludesthetimeofdaythemusicinthebackgroundwhetheryousitorstandetc. ToRememberYourPIN TechniqueCountitout Youcoulduseyourbirthdayoryourphonenumberbutidentitythieveshaveawayoffiguringthosenumbersout.3Writeafour—wordsentencethencountthenumberoflettersineachword.ForinstanceThisismyPIN＝4223. ToRememberFaces TechniqueFocusonnoses Whilesomesupermemorizersspecializeinassociatingnameswithfacesthememory—palacetechniquedoesn'tworkaswelliftheimageofthefaceischangedinanyway.Ratherthanfocusingoneyesasmostpeopledofocusonthecentreortotheleftofapersonsnose.4 ToRememberFacts&figures Technique5 Tolearnandrememberstatisticsreviewingthematerialrepeatedlyoveralongertimeisfarmoreeffectivethanrepeatingitinashorterone.Ifyourexamisinaweekstudytodayandthenagaininadayortwo.Ifitsamonthawaystudytodayandthenwaitaweekbeforeyoursecondsession. A.Valueexams. B.Giveyourselftime. C.Thisallowsyoutotakeintheirwholeface. D.Theirbrainstructuresareinfactthesameastherestofours. E.InsteadtrythistipfromDominicaneight—timeWorldMemoryChampion. F.Thetheoryisthatyourbrainlinksthewordstotheenvironmentaroundyou. G.Studiesshowedthatvaryingotheraspectsofyourenvironmentcanalsohelp.
QianZhongshuwasaChinesescholarandwriterknownforhiswitanderudition博学.DespitefailinginmathematicsQian1successenteredtheDepartmentofForeignLanguagesunderTsinghuaUniversityin1929becauseofhis2excellenceperformanceinChineseandEnglishlanguages.InTsinghuahemethiswifeYangJiangwhowastobecomeasuccessfulplaywrightandtranslatorand3marryherin1935.InthesameyearQianreceivedgovernmentsponsorship4promotehisstudiesabroad.TogetherwithhiswifeQianheadedfortheUniversityofOxfordinBritain.After5spendtwoyearsatExeterCollegehereceivedabachelorofliterature.HestudiedforonemoreyearintheUniversityofParisinFranceandhedidn'treturntoChina61938. QianlivedinShanghaifrom1941to19457wasthenunderJapaneseoccupation.Atthattimehedevoted8hetowritingandmanyofhisworkswerewrittenorpublishedthen.Acollectionofshort9essayWritingintheMarginsofLifewaspublishedin1941.HismostcelebratedworkFortressBesiegedappearedin1947.OntheArtofPoetrywritten10classicalChinesewasissuedin1948.
下列说法中正确的是
一列横波沿x轴正方向传播在t＝0时刻的波形曲线如图所示．已知这列波的质点P从t＝0时刻起第一次达到波峰的时间为0.6s质点PQ的坐标分别为10和70则有
Chinesehigh—speedrailwayareavery1comfortwaytotravel.Theyarecleanquietandefficient.Chinahasledotherdevelopingcountriesandevensomedevelopedonesinthisfieldsincethefirsthigh—speedtrain2comeintousein2008. Thestationsare3mainbuiltoutsidethetowncentrebutlocaltransporthasbeenlengthened4connectthehigh—speednetwork.Thefacilitiesonthetrainarenewandthestaffarewelltrained.Eventhesecondclass5chairprovideplentyofspace.Thepassengersaresowide6youcanmovewithoutdisturbinganyone.Youcanuseyourmobilephoneaccess7Internetorworkonyourlaptop.Thereisalsoarestaurantcarthoughthekindsoffood8belimited.Thetoiletsarelargecleananduser—friendlytoo.Thetrainalmostdoesntrock.Evenwhenthetrainbrakesyoucanhardlyfeelitshake. What'smorewithafastercheck—inthehigh—speedtrainsarealso9littleaffectedbyweatherthanplanes.Seldomare10delayedorcancelledforweathercondition.Thereforetheyhavebecomethefirstchoiceformanypassengers.
Knowingwhattodoatcheckoutandproperlypreparingforitcanturnapotentiallyheatedsituationintoaquickthankyouaddgoodbye.Belowwemadealistoffivethingsyoushouldrememberathotelcheckout. Don'tbelatetocheck Hotelsmayaddanextremelyhighpriceforbeingjustahalfhourlate.Ifyouknowyouwon'tmakethecutofftimeitneverhurtstocallaheadandtrytonegotiateawayapotentialcharge. Don'tforgettodoublecheektheroomandsafe Makesureyoudon'tleavethingsbehind.Ifyouhaveanearlyflightorcheckouttimepackupasmuchasyoucanthenightbeforesothatlast—minuterushisn'ttooannoying.Alsobesuretotakeoutanythingintheroomsafe. Don'tforgettotipthehousekeepers It'salwayspolitetoleavesomemoneyforthepeoplekeepingyourroomclean. Don'tignorethedetailedbill Youmaybeinarushbutgivethedetailedhillacarefullooktoseeifthehotelchargeisdifferentfromtherateyouinitiallybooked. Don'tgetangry Shootingattheassistantmanagerstandingbehindthefrontdeskprobablywon'thelp. Whendealingwithanunexpecteditemonthebill.Thinkabouthowdifficultitcanbetodealwithannoyedcustomers.Keepcalmandthingsmaybesolvedbetterandsooner. 1Thehotelwillchargeyoumoremoneyifyou. A.checkbeforecutofftime B.donotcallthehotelahead C.arelateincheckingout D.negotiatewiththeclerks 2Whichofthefollowingdoestheauthorsuggestdoing? A.Leavingsomethingbehind. B.Beingsuretokeeptheroomclean. C.Doingthepack—upasearlyaspossible. D.Tippingthehousekeeperstoshitrespect. 3Whatisthepurposeofthelastparagraphofthepassage? A.Tosuggestawaytosolveproblemsproperly B.Toprovidemoreinformationaboutthehotel. C.Toshowtheuneasinessofassistantmanagers D.Toprotectcustomersfromunnecessarydangers. 4Inwhichsectionofthemagazinecanyouprobablyfindsuchapassage? A.Fitness. B.Nature. C.Lifestyle. D.Travel.
探究力对物体做的功与物体获得的速度的关系实验装置如图俯视图关于实验主要过程说法正确的是
Itisgenerallyacknowledgedthatyoungpeoplefrompoorersocio—economicbackgroundstendtodolesswellintheeducationsystem.InanattempttohelpthechildrenofpoorfamiliesanationwideprogramcalledHeadstartwasstartedintheUSin1965.Alotofmoneywaspouredintoit.Ittookchildrenintopre—schoolinstitutionsattheageofthreeandwassupposedtohelpthemsucceedinschool.Buttheresultshavebeendisappointingbecausetheprogrambegantoolate.Manychildrenwhoentereditatthreewerealreadybehindtheirpeersinlanguageandintelligenceandtheparentswerenotinvolvedintheprocess.AttheendofeachdayHeadstartchildrenreturnedtothesamedisadvantagedhomeenvironment. ToimprovetheresultsanotherprogramwasstartedinMissourithatconcentratedonparentsasthechild'sfirstteachers.Thisprogramwasbasedonresearchshowingthatworkingwiththefamilyisthemosteffectivewayofhelpingchildrengetthebestpossiblestartinlife.Thefour—yearstudyincluded380familieswhowereabouttohavetheirfirstchildandrepresenteddifferentsocial—economicstatusageandfamilystructure.Theprograminvolvedtrainededucatorsvisitingandworkingwiththeparentorparentsandthechild.Theprogramalsogavetheparentssomeguidanceandusefulskillsonchilddevelopment. AtthreethechildreninvolvedintheMissouriprogramwereevaluatedwiththechildrenselectedfromthesamesocio—economicbackgroundandfamilysituations.Theresultswereobvious.Thechildrenintheprogramweremoreadvancedinlanguagedevelopmentproblemsolvingandotherintellectualskillsthantheirpeers.Theyperformedequallywellregardlessofsocio—economicbackgroundsorfamilystructure.Theonefactorthatwasfoundtoaffectthechild'sdevelopmentwasthepoorqualityofparent—childinteraction.Thatinteractionwasnotnecessarilybadinpoorerfamilies. TheMissouriprogramcomparesquitedistinctlywiththeHeadstartprogram.Withoutasimilarfocusonparenteducationandonthevitalimportanceofthefirstthreeyearssomeevidenceindicatesthatitwillnotbeenoughtoovercomeeducationalunfairness. 1WhatcausedthefailureoftheHeadstartprogram? A.Thelargenumberofpoorfamilies. B.Thedisapprovalfromchildren. C.Thelatestartoftheprogram. D.Thelongperiodoftime. 2WhatdoweknowabouttheMissouriprogram? A.Itfocusedonthechildren'sfirstschoolteachers. B.Ithelpedthechildrenreturntothesamehome. C.Itmadethechildrenimprovedinmanyaspects. D.Itgavetheparentsadviceontheirdevelopment. 3Accordingtothepassagewhatislikelytoinfluencechildren'sperformance? A.Thenumberoffamilymembers. B.Theparent—childcommunication. C.Theintelligenceoftheirparents. D.Theteacher—studentrelationship. 4Howdoestheauthordevelopthepassage? A.Bylistingfigures. B.Bymakingcomparisons. C.Bygivingexamples. D.Bydrawingconclusions.
质量m＝1.0kg的物块A可视为支点轻弹簧的上端连接弹簧下端固定在光滑斜面底端斜面的倾斜角θ＝30°．平衡时弹簧的压缩量为x＝0.20m此时具有的弹性势能Ep＝0.50J物块A处在O时弹簧为原长如图所示．一质量m＝1.0kg物块B可视为质点从距离物块A为d＝2.0m处从静止开始沿斜面下滑与物体A发生碰撞后立刻一起向下运动但不粘连它们到达最低点后又向上运动．g＝10m/s2求 1物块B与物体A碰撞后的速度 2物块B向上运动到达的最高点与O的距离s．
Ahumpbackwhaleisstrugglinghardinthesea.Thehumpbackscanweigh40tonsandstretch50feelfromnosetotail.That'sthekindof1andsizethateasilyoverturnsmallboats.Tojumpontothe2ofoneofthesegiantsis3toresultinadisaster.Butthat'sjustwhatSamSynsleliendidwhenhesawahumpback4caughtinaropethatwas5toabuoy浮标inCentralCaliforniansMorroBaythisweek. SamalongwithcrewmateNicholasTaronhadalreadytried6theunfortunatewhaletotheU.S.CoastGuard一buttheyweretolditwouldbehoursbefore7couldbesent.8thecommercialfishermen9thiswhaledidn'thave.Ifthewhalewasto10theyhadtogogetit.Therewasnoother11forthewhale.Theydecidedtogoforittotally12thefear.Turon's13intherescuewasmostlyinthe14cheeringdepartment.Intheclipyoucanhearhimdirectingtheoperationfromthesideoftheboatwhilefilmingtheentire15. Swim!Swim!HeyellsMove!Justgetit!Getit! Theanxiouswhalewasjustswimmingincounter﹣clockwisecircles16andbeingheldtothebottom.Itthrewitsheavytailagainsttheboat.ButSam17itandjumpedontothewhale'sbacktosaveitslife.Hemanagedtohanginthere18cuttingthroughtheropethat19thecreature.Andthenwithawhoosh击水声itdovedeepdownbeneaththegreat20.Itwasn'tmuchofathankyoubutSynstelienandTaronwereleftwithawhaleofatale. 1A.length B.violence C.ability D.weight 2A.nose B.head C.back D.tail 3A.willing B.likely C.anxious D.flexible 4A.hopelessly B.loosely C.curiously D.secretly 5A.stuck B.directed C.adjusted D.attached 6A.shipping B.delivering C.reporting D.hunting 7A.boats B.rescuers C.fishermen D.experts 8A.Strength B.Advantages C.Patience D.Hours 9A.figured B.objected C.hesitated D.proved 10A.paddle B.survive C.relax D.breathe 11A.barrier B.accommodation C.option D.equipment 12A.hiding B.exhibiting C.fostering D.ignoring 13A.interest B.ambition C.role D.contribution 14A.disturbing B.enthusiastic C.clumsy D.scared 15A.operation B.creature C.performance D.fighting 16A.silent B.stressed C.confused D.unconscious 17A.wrestled B.spotted C.trained D.approached 18A.eventually B.naturally C.directly D.normally 19A.prohibited B.injured C.tied D.monitored 20A.waves B.noises C.ferry D.darkness
Unitthe1980sscientistsweretrainedtoignoreanimalpainaccordingtothebeliefthattheabilitytofeelpainwasassociatedonlywithhigherconsciousness.Howevertodayscientistsviewhumansasaspeciesofanimalsandlargelyacceptthatmanyspeciesarecapableofsomelevelofself﹣awareness.1 Ifyouhitanotherpersoninthefaceyoucanestimatetheirpainlevelbywhattheydoorsayinresponse.2Graduallyscientistshavedevelopedasetofindicatorsofpainresponseinnon﹣humananimals.Demonstratingaresponsetoanegativestimulationanddisplayingprotectivebehaviorofinjuredareasaretwomajorsigns. 3Someresearchersarguelobsters龙虾aretoodissimilartovertebrates脊椎动物tofeelpain.Nonethelesslobstersdosatisfyallofthestandardsforapainresponse.Lobstersguardtheirinjuriesandlearntoavoiddangeroussituations.Theyareevenbelievedtopossesssomelevelofconsciousness.Inresulttodaymostscientistsagreethatinjuringalobstercausesphysicalpain. Duetogrowingevidencethatthelobstersmayfeelpainitisnowillegaltoboillobstersaliveorkeepthemoniceinsomecountries.Eveninlocationswhereboilinglobstersremainslegalmanyrestaurantsprefermorehumanemethods.4Tosatisfypickydinersmorerestaurantsruleoutthecruelcookingmethods. CurrentlythemosthumanetoolforcookingalobsteristheCrustaStun.Thisdeviceelectrocutes电击alobster.5Thefollowingprocessofcookingissuretocausenopain.Incontrastittakesabout2minutesforalobstertodiefromboilingwaterduringwhichtimepainlasts. A.Buthugedisagreementexists. B.Thecreatureinstantlylosesconsciousnessinhalfasecond. C.Itbeatstheformermethodbysavingchefs'effortincleaningthecreature. D.It'sdifficulttoassesspaininotherspeciesbecausewecannotcommunicateaseasily. E.Peoplearecomingtorealizethatotherspeciesmightalsoenjoytheluxuryofemotion. F.Exceptformoralconsiderationmanychefsbelievestressnegativelyaffectstheflavor味道ofthemeat. G.Legalprohibitionbecomesthemajorconsiderationforrestaurantswhenchoosingacookingmethod.
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