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已知某几何体的三视图如图所示，网格中小正方形的边长为1，则该几何体的表面积为（ ）
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高三下学期数学《》真题及答案
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如图所示网格纸上小正方形的边长为1图形为某空间几何体的三视图则该几何体的体积为
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如图网格纸上小正方形的边长为1粗线画出的是某几何体的三视图则此几何体的体积为
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如图所示网格纸上小正方形的边长为1粗线画出的是某几何体的三视图则此几何体的表面积为
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如图网格纸上小正方形的边长为1粗线画出的是某几何体的三视图则该几何体的表面积为
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某空间几何体的三视图如图所示图中小正方形的边长为1则这个几何体的体积是
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已知某几何体的三视图如图所示其中网格纸的小正方形的边长是1则该几何体的表面积为
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一个几何体的三视图如图所示网格中小正方形的边长均为1那么下列选项中最接近这个几何体的侧面积的是
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某几何体的三视图如图所示则这个几何体是
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如图所示网格纸上小正方形的边长为1粗线画出的是某几何体的三视图则此几何体的表面积为
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“垛积术”隙积术是由北宋科学家沈括在梦溪笔谈中首创南宋数学家杨辉元代数学家朱世杰丰富和发展的一类数列求和方法有茭草垛方垛刍童垛三角垛等等．某仓库中部分货物堆放成如图所示的“茭草垛”自上而下第一层1件以后每一层比上一层多1件最后一层是n件．已知第一层货物单价1万元从第二层起货物的单价是上一层单价的．若这堆货物总价是万元则n的值为
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Cooperationatworkisgenerallyseenasagoodthing.ThelatestsurveybytheFinancialTimesofwhatemployerswantfromMBAgraduatesfoundthattheabilitytoworkwithawidevarietyofpeoplewaswhatmanagerswantedmost.Butmanagersalwayshavetobalancethebenefitsofteamworkwhichhelpensurethateveryoneisworkingtowardsthesamegoalwiththedangersof'groupthink'whencriticsarereluctanttopointoutaplan'sdrawbacksforfearofbeingkeptoutofthegroup.ThedisastrousBayofPigsinvasionofCubain1961wasaclassiccaseofgroupthink.SkepticswerereluctanttochallengeJohnF.KennedythenewlyelectedAmericanpresident.Moderncommunicationmethodsmeanthatcooperationismorefrequent.Workersareconstantlyintouchwitheachotherviaemailmessaginggroupsormobilecalls.Butdoesthatimproveorlowerperformance?AnewstudybythreeAmericanacademicstriedtoanswerthisquestion.Theysetalogicalproblemdesigningtheshortestrouteforatravellingsalesmanvisitingvariouscities.Threegroupswereinvolved:onewheresubjectsactedindependently;anotherwheretheysawthesolutionspostedbyteammembersateverystage;andathirdwheretheywerekeptinformedofeachother'sviewsonlyintermittently.Thesurveyfoundthatmembersoftheindividualistgroupreachedthepremiersolutionmoreoftenthantheconstantcooperatorsbuthadapooreraverageresult.Theintermittentcooperatorsfoundtherightresultasoftenastheindividualistsandgotabetteraveragesolution.Whenitcomestoidealgenerationgivingpeopleabitofspacetoasolutionseemstobeagoodidea.Occasionalcooperationcanbeabighelp:mostpeoplehavebenefitedfromacolleague'sbrainwaveorjustasoftenwiseadvicetoavoidaparticularcourseofaction.FurthercluescomefromabookSupermindsbyThomasMaloneoftheMassachusettsInstituteofTechnology.Hesaysthatthreefactorsdeterminethecollectiveintelligenceofcooperatinggroups:socialintelligencehowgoodpeoplewereatratingtheemotionalstatesofothers;theextenttowhichmemberstookpartequallyinconversationthemoreequalthebetter;andthecooperationofwomeninthegroupthehigherthebetter.Groupsrankedhighlyintheseareascooperatedfarbetterthanothers.Inshortcooperationmaybeausefultoolbutitdoesn'tworkineverysituation.1TheauthorcitestheexampleofTheBayofPigsinvasionofCubainParagraph1to.A.provethatteamplayersareskilledatcommunicationB.showthatteamworkcannotalwaysbebeneficialC.provethatcriticsareunwillingtochallengeanybodyD.showthedangerofgroupthinkisnotveryserious2Theunderlinedphrase'theintermittentcooperators'inParagraph3refersto.A.thosewhodonotcooperatewitheachotherB.thosewhoareseldominformedofother'sviewsC.thosewhocooperatewithothersoccasionallyD.theconstantcooperatorswithapooraverageresult3Whichofthefollowingfactorsmakesateamcooperatebetteraccordingtothefourthparagraph?A.Groupmemberscooperatingallthetime.B.Groupmembersinagoodemotionalstate.C.Equaldistributionofmenandwomen.D.Equalparticipationinthecommunication.4Whichcanbethebesttitleofthepassage?A.WhenTeamworkWorksB.WhatTeamworkIsAboutC.WhyTeamworkOperatesD.AUsefulTool:Cooperation
某种大型医疗检查机器生产商对一次性购买2台机器的客户推出两种超过质保期后两年内的延保维修优惠方案 方案一交纳延保金7000元在延保的两年内可免费维修2次超过2次每次收取维修费2000元 方案二交纳延保金10000元在延保的两年内可免费维修4次超过4次每次收取维修费1000元． 某医院准备一次性购买2台这种机器．现需决策在购买机器时应购买哪种延保方案为此搜集并整理了50台这种机器超过质保期后延保两年内维修的次数得下表 以这50台机器维修次数的频率代替1台机器维修次数发生的概率．记X表示这2台机器超过质保期后延保的两年内共需维修的次数． Ⅰ求X的分布列 Ⅱ以所需延保金及维修费用的期望值为决策依据医院选择哪种延保方案更合算
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Asdataandidentitytheftbecomesmoreandmorecommonthemarketisgrowingforbiometric生物测量technologies﹣likefingerprintscans﹣tokeepothersoutofprivatee﹣spaces.Atpresentthesetechnologiesarestillexpensivethough.ResearchersfromGeorgiaTechsaythattheyhavecomeupwithalow﹣costdevice装置thatgetsaroundthisproblem:asmartkeyboard.Thissmartkeyboardpreciselymeasuresthecadence节奏withwhichonetypesandthepressurefingersapplytoeachkey.Thekeyboardcouldofferastronglayerofsecuritybyanalyzingthingsliketheforceofauser'stypingandthetimebetweenkeypresses.Thesepatternsareuniquetoeachperson.Thusthekeyboardcandeterminepeople'sidentitiesandbyextensionwhethertheyshouldbegivenaccesstothecomputerit'sconnectedto﹣regardlessofwhethersomeonegetsthepasswordright.Italsodoesn'trequireanewtypeoftechnologythatpeoplearen'talreadyfamiliarwith.Everybodyusesakeyboardandeverybodytypesdifferently.Inastudydescribingthetechnologytheresearchershad100volunteerstypetheword'touch'fourtimesusingthesmartkeyboard.Datacollectedfromthedevicecouldbeusedtorecognizedifferentparticipantsbasedonhowtheytypedwithverylowerrorrates.Theresearcherssaythatthekeyboardshouldbeprettystraightforwardtocommercializeandismostlymadeofinexpensiveplastic﹣likeparts.Theteamhopestomakeittomarketinthenearfuture.1Whydotheresearchersdevelopthesmartkeyboard?A.Toreducepressureonkeys.B.Toimproveaccuracyintyping.C.Toreplacethepasswordsystem.D.Tocutthecostofe﹣spaceprotection.2Whatmakestheinventionofthesmartkeyboardpossible?A.Computersaremucheasiertooperate.B.Fingerprintscanningtechniquesdevelopfast.C.Typingpatternsvaryfrompersontoperson.D.Datasecuritymeasuresareguaranteed.3Whatdotheresearchersexpectofthesmartkeyboard?A.It'llbeenvironment﹣friendly.B.It'llreachconsumerssoon.C.It'llbemadeofplastics.D.It'llhelpspeeduptyping.4Whereisthistextmostlikelyfrom?A.Adiary.B.Aguidebook.C.Anovel.D.Amagazine.
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Thechangesfacingfastfoodcompanies Fastfoodwasoncethoughttoberecessionproof.WhenconsumersneedtocutspendingcheapmealslikeBigMacsandWhoppersbecomeevenmoreattractive.Asaresultfastfoodchainshavesurvivedtherecessionbetterthantheirmoreexpensivecompetitors.In2009salesatfullservicerestaurantsinAmericafellbymorethan6%buttotalsalesremainedaboutthesameatfastfoodchains.InsomemarketssuchasJapanFranceandBritaintotalspendingonfastfoodincreased. Butinthisongoingrecession萧条whichismoreseverenotallfastfoodcompanieshavebeenasfortunate.ManysuchasBurgerKinghaveseensalesfall.Intherecessionwhilesomepeopletradedowntofastfoodmanyotherseatathomemorefrequentlytosavemoney.SmallerfastfoodchainsinAmericasuchasJackintheBoxandCarl'sJr.havebeenhitparticularlyhardinthisdownturnbecausetheycutbackspendingonadvertising. Infaceofsuchchallengessomefastfoodcompanieshavesacrificedtheirownprofitsbytryingtogivecustomersbettervalue.Duringtherecessioncompaniessetpriceslowhopingtotemptmorecustomersthroughthedoor.Butinmanycasesthatstrategydoesn'twork.Somecompaniesarerethinkingtheirstrategies.KFChaslaunchedachickensandwichthatcostsaround﹩5toattractconsumersawayfrom﹩1specials. Companiesarealsotryingtogetcustomerstobuynewandmoreitemsincludingdrinks.McDonald'sstartedsellingbettercoffeeasachallengetoStarbucks.ItsMcCafelinenowaccountsforanestimated6%ofsalesinAmerica.Asfastfoodcompaniesshiftfromsupersizetomorebuystheyneedtokeepcustomertraffichighthroughouttheday.Manyseebreakfastasabigopportunityandnotjustforfattyfood.McDonald'shasstartedsellingporridgeinAmericabecausetheprofitscanbehigh. Butwhataboutthosegrowingwaistlines?Sofarfastfoodfirmshavecleverlyavoidedgovernmentregulation.Byprovidingoptionslikesaladsandlowcaloriesandwichestheyhaveatleastgiventheimpressionofdoingsomethingabouthelpingtofightobesity肥胖.Theseofferingsdon'tnecessarilyleadtoprofitlossastheycanbroadentheappealofstorestogroupsofdinersthatincludesomepeoplewhodon'twanttoeataburger. Butcallsfortoughergovernmentregulationneverweardown.ThisyearCongresspassedAmerica'shealthreformbillwhichrequiresrestaurantchainswith20ormorestorestoputthecaloriecontentofitemstheyservetothemenu.AndtherecentproposalbyacountyinCaliforniatobanMcDonald'sfromincludingtoysinitshighcalorieHappyMealsbecauselawmakersbelieveitattractschildrentounhealthyfoodsuggeststhatfastfoodcompanieswillhavetocontinuetryingsomethingnew. Thechangesfacingfastfoodcompanies
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