首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
已知ξ=(1,1,-1)T是矩阵的特征向量. (1)求α、β的值. (2)证明A的任一特征向量都能由ξ线性表示.
查看本题答案
包含此试题的试卷
国家统考科目《问答》真题及答案
点击查看
你可能感兴趣的试题
已知A是三阶实对称矩阵特征值是13-2其中α1=12-2Tα2=4-1aT分别是属于特征值λ=1与λ
设3阶对称矩阵A的特征值λ1=1λ2=2λ3=-2a1=1-11T是A的属于λ1的一个特征向量
设633为实对称矩阵A的特征值属于6的特征向量为α1=11k-1属于3的一个特征向量为α2=-101
设3阶对称矩阵A的特征值λ1=1λ2=2λ3=-2又α1=1-11T是A的属于λ1的一个特征向量.记
设3阶对称矩阵A的特征向量值λ1一1λ2=2λ3=-2又α1=1-11T是A的属于λ1的一个特征向量
已知λ1=6λ2=λ3=3是实对称矩阵A的三个特征值.且对应于λ2=λ3=3的特征向量为α2=-10
已知λ1=6λ2=λ3=3是实对称矩阵A的三个特征值且对应于λ2=λ3=3的特征向量为α2=-101
2009设A是3阶实对称矩阵P是3阶可逆矩阵B=P-1AP已知α是A的属于特征值λ的特征向量则B的属
Pα
P-1α
PTα
(P-1)Tα
设3阶实对称矩阵A的特征值为λ1===1λ2=2λ3=-2α1=1-11T是A的属于λ1的一个特征向
已知λ1=6λ2=λ3=3是实对称矩阵A的三个特征值且对应于λ2=λ3=3的特征向量为α2=-101
设A是3阶实对称矩阵P是3阶可逆矩阵B=P-1AP已知α是A佝属于特征值λ的特征向量则B的属于特征值
Pα
P
-1
α
P
T
α
(P
-1
)
T
α
设A是三阶矩阵α1=101Tα2=110T是A的属于特征值1的特征向量α3=012T是A的属于特征值
α1-α2是A的属于特征值1的特征向量
α1-α3是A的属于特征值1的特征向量
α1-α3是A的属于特征值2的特征向量
α1+α2+α3是A的属于特征值1的特征向量
设A为三阶实对称矩阵λ1=8λ2=λ3=2是其特征值.已知对应λ1=8的特征向量为α1=[1k1]T
设3阶实对称矩阵A的特征值λ1=1λ2=2λ3=-2α1=1-11T是A的属于λ1的一个特征向量记
设A是三阶矩阵有特征值λ1=1λ2=-2λ3=3对应的特征向量分别是ξ1=[1-21]Tξ2=[10
设3阶实对称矩阵A的特征值为λ1=1λ2=2λ3=-2α1=1-11T是A的属于λ1的一个特征向量.
设A是三阶矩阵有特征值λ1λ2λ3其对应的特征向量分别是ξ1=[100]Tξ2=[110]Tξ3=[
设3阶实对称矩阵A的特征值是123矩阵A的属于特征值12的特征向量分别是α1=-1-11Tα2=1-
已知矩阵A第一行3个元素是3-1-2又α1=111Tα2=120Tα3=101T是矩阵A的三个特征向
已知λ1=6λ2=λ3=3是实对称矩阵A的三个特征值且对应于λ2=λ3=3的特征向量为α2=-101
热门试题
更多
Text4 Virtuallyeverythingastronomersknowaboutobjectsoutsidethesolarsystemisbasedonthedetectionofphotons-quantaofelectromagneticradiation.Yetthereisanotherformofradiationthatpermeatestheuniverse:neutrinos.Withasitsnameimpliesnoelectricchargeandnegligiblemasstheneutrinointeractswithotherparticlessorarelythataneutrinocancrosstheentireuniverseeventraversingsubstantialaggregationsofmatterwithoutbeingabsorbedorevendeflected.Neutrinoscanthusescapefromregionsofspacewherelightandotherkindsofelectromagneticradiationareblockedbymatter.Notasinglevalidatedobservationofanextraterrestrialneutrinohas.sofarbeenproduceddespitetheconstructionofastringofelaborateobservatoriesmountedontheearthfromSouthernIndiatoUtahtoSouthAfrica.Howeverthedetectionofextraterrestrialneutrinosareofgreatsignificanceinthestudyofastronomy.Neutrinoscarrywiththeirinformationaboutthesiteandcircumstancesoftheirproduction;thereforethedetectionofcosmicneutrinoscouldprovidenewinformationaboutawidevarietyofcosmicphenomenaandaboutthehistoryoftheuniverse. Howcanscientistsdetectaparticlethatinteracts.soinfrequentlywithothermatterTwenty-fiveyearspassedbetweenPauli’shypothesisthattheneutrinoexistedanditsactualdetection;sincethenvirtuallyallresearchwithneutrinoshasbeenwithneutrinoscreatedartificiallyinlargeparticleacceleratorsandstudiedunderneutrinomicroscopes.Butaneutrinotelescopecapableofdetectingcosmicneutrinosisdifficulttoconstruct.Noapparatuscandetectneutrinosunlessitisextremelymassivebecausegreatmassissynonymouswithhugenumbersofnucleonsneutronsandprotonsandthemoremassivethedetectorthegreatertheprobabilityofoneofitsnucleon’sreactingwithaneutrino.Inadditiontheapparatusmustbesufficientlyshieldedfromtheinterferingeffectsofotherparticles. Fortunatelyagroupofastrophysicistshasproposedameansofdetectingcosmicneutrinosbyharnessingthemassoftheocean.NamedDUMANDforDeepUnderwaterMuonandNeutrinoDetectortheprojectcallsforplacinganarrayoflightsensorsatadepthoffivekilometersundertheoceansurface.Thedetectingmediumistheseawateritself:whenaneutrinointeractswithaparticleinanatomofseawatertheresultisacascadeofelectricallychargedparticlesandaflashoflightthatcanbedetectedbythesensors.Thefivekilometersofseawaterabovethesensorswillshieldthemfromtheinterferingeffectsofotherhigh-energyparticlesrainingdownthroughtheatmosphere. ThestrongestmotivationfortheDUMANDprojectisthatitwillexploitanimportantsourceofinformationabouttheuniverse.Theextensionofastronomyfromvisiblelighttoradiowavestox-raysandgammaraysneverfailedtoleadtothediscoveryofunusualobjectssuchasradiogalaxiesquasarsandpulsars.Eachofthesediscoveriescameasasurprise.Neutrinoastronomywilldoubtlesslybringitsownshareofsurprises. escapefromLine6Para.1canbesubstitutedfor
一家德国公司在美国出售50g美元的长期政府债券然后将收入暂时存入美国银行这样应该在美国的国际收支平衡表中作的反映
Text3 TheuniquenessoftheJapanesecharacteristheresultoftwoseeminglycontradictoryforces:thestrengthoftraditionsandtheselectivereceptivitytoforeignachievementsandinventions.Asearlyas1860stherewerecountermovementtotraditionalorientation.OneofthefanusspokesmenofJapan’s"Enlightenment"claimed"theConfuciancivilizationoftheEastseemstometolacktwothingspossessedbyWesterncivilization:scienceinthematerialsphereandasenseofindependenceinthespiritualsphere."AnotherbreakofrelativeliberalismfollowedWorldWarIwhenthedemocraticidealismofPresidentWoodrowWilsonhadanimportantimpactonJapaneseintellectualsandespeciallystudents;butmoreimportantwastheLeninistideologyofthe1917BolshevikRevolution.Againintheearly1930snationalismandmilitarismbecamedominant. FollowingtheendofWorldWarⅡsubstantialchangeswereundertakeninJapantoliberatetheindividualfromauthoritarianrestraints.Thenewdemocraticvaluesystemwasacceptedbymanyteachersstudentsintellectualsandoldliberalsbutitwasnotimmediatelyembracedbythesocietyasawhole.Japanesetraditionsweredominatedbygroupvaluesandnotionsofpersonalfreedomandindividualrightswereunfamiliar. TodaydemocraticprocessesareclearlyevidentinthewidespreadparticipationoftheJapanesepeopleinsocialandpoliticallife.Schooltextbooksemphasizeequalityoverhierarchyandrationalismovertradition;butinpracticethesevaluesareoftenmisinterpretedanddistortedparticularlybytheyouthwhotranslatetheindividualisticandhumanisticgoalsofdemocracyintoegoisticandmaterialisticones. MostJapanesepeoplehaveconsciouslyrejectedConfucianismbutleftoversoftheoldorderremain.Animportantfeatureofrelationshipinmanyinstitutionsincludingpoliticalpartiesanduniversitiesisthe"oyabun-kobun"orparent-childrelation.Thecorrespondingloyaltyoftheindividualtohispatronreinforceshisallegiancetothegrouptowhichtheybothbelong.Awillingnesstocooperatewithothermembersofthegroupandtosupportwithoutqualificationtheinterestsofthegroupinallitsexternalrelationsisstillawidelyrespectedvirtue.The"oyabun-kobun"createsladdersofmobilitywhichanindividualcanascendrisingasfarasabilitiespermitsolongashemaintainssuccessfulpersonaltieswithasuperiorintheverticalchannelthelatterrequirementusuallytakingprecedenceoveraneedforexceptionalcompetence.Asaconsequencethereislittlehorizontalrelationshipbetweenpeopleevenwiththesameprofession. ThespokesmanofJapan'sEnlightenmentthinksthat
阅读下列有关认识和实践关系的一组材料材料1观念有三类天赋的外来的虚构的这是按照不同来源而做出的区分虚构的观念是思想自己制造出来的天赋的和外来观念都是由思想以外的原因所造成的因此上述观念可合并为两种思想自己制造出来的和由外部原因造成的思想自己制造出来的观念不是真实的而在外部原因所造成的观念中有一些是真实的有一些不是真实的前者指上帝造成的观念后者指可感事物造成的观念——摘自西方哲学简史材料2心灵是一块白板上面没有记号只是通过经验的途径心灵才有了观念因此经验是观念的唯一来源经验分为感觉和反省两类感觉是观念的内在来源它是通过外物地刺激而产生观念的过程反省是观念的内在来源心灵不但消极的接受外物的刺激它自身也是内部感官有对刺激进行反作用的主动性心灵通过感觉而对取得的观念进行反思从而得到新观念它还会对自身的活动进行反思得到另外一些观念这些观念多与感情有关感觉和反省不是相互独立的活动它们可以共同起作用因此有些观念同时有两个来源——摘自西方哲学简史材料3人的思维最本质和最切近的基础正是人所引起的自然界的变化而不是单独的自然界本身人的智力是按照人如何学会改变自然界而发展的认识是思维对客体的永远的无止境的接近自然界在人的思想中的反映要理解为不是‘僵死的’不是‘抽象的’不是没有运动的不是没有矛盾的而是处在运动的永恒过程中处在矛盾的发生和解决的永恒过程中——摘自马克思恩格斯选集第3卷材料4恩格斯说资产阶级为了发展它的工业生产需要有探索自然物体的物理特征和自然力的活动方式的科学近代工业不仅提供了大量可供观察的材料而且自身也提供了和以往完全不同的实验手段并使新的工具的制造成为可能——摘自马克思恩格斯选集第3卷请回答问题1材料1认为的观念是从哪里来的如何理解有些观念同时有两个来源材料1和材料2所反映观点有什么区别2如何理解人的思维最本质和最切近的基础正是人所引起的自然界的变化而不是单独的自然界本身说明材料3在认识论上的基本观点3根据材料3和材料4说明实践和认识的辩证关系
马克思认为商品形式的奥秘不过在于商品形式在人们面前把人们本身劳动的社会性质反映成劳动产品本身的物的性质反映成这些物的天然的社会属性从而把生产者同劳动的社会关系反映成存在于生产者之外的物与物之间的社会关系由于这种转换劳动产品成了商品成了可感觉而又超感觉的物或社会的物这表明
我国市场经济体制改革的重点和中心环节是
In1942AllanRHolmbergadoctoralstudentinanthropologyfromYaleUniversityUSAventureddeepintothejungleofBolivianAmazoniaandsearchedoutanisolatedbandofSirionoIndians.TheresearcherdescribedtheprimitivesocietyasadesperatestraggleforsurvivalaviewofAmazoniabeingfundamentallyreconsideredtoday. 41._______________ TheSirionoHolmbergwroteleda"strikinglybackward"existence.Theirvillageswerelittlemorethanclustersofthatchedhuts.Lifeitselfwasaperpetualandpunishingsearchforfood:somefamiliesgrewmaniocandotherstarchycropsinsmallgardenplotsclearedfromtheforestwhileothermembersofthetribescouredthecountryforsmallgameandpromisingfishholes.Whenlocalresourcesbecamedepletedthetribemovedon.AsfortechnologyHolmbergnotedtheSiriono"maybeclassifiedamongthemosthandicappedpeoplesoftheworld".OtherthanbowsarrowsandcrudediggingstickstheonlytoolstheSiriono.seemedtopossesswere"twomachetesworntothesizeofpocket-knives". 42._______________ AlthoughthelivesoftheSirionohavechangedintheinterveningdecadestheimageofthemasStoneAgerelicshasendured.TocasualobserversaswellastoinfluentialnaturalscientistsandregionalplannerstheluxuriantforestsofAmazoniaseemagelessunconquerableahabitattotallyhostiletohumancivilization.TheapparentsimplicityofIndianwaysoflifehasbeenjudgedanevolutionaryadaptationtoforestecologylivingproofthatAmazoniacouldnot—andcannot—sustainamorecomplexsociety.Archaeologicaltracesoffarmoreelaboratecultureshavebeendismissedastheruinsofinvadersfromoutsidetheregionabandonedtodecayintheuncompromisingtropicalenvironment. 43._______________ ThepopularconceptionofAmazoniaanditsnativeresidentswouldbeenormouslyconsequentialifitweretrue.ButthehumanhistoryofAmazoniainthepast11000yearsbetraysthatviewasmyth.Evidencegatheredinrecentyearsfromanthropologyandarchaeologyindicatesthattheregionhassupportedaseriesofindigenousculturesforeleventhousandyears;anextensivenetworkofcomplexsocieties—somewithpopulationsperhapsaslargeas100000—thrivedthereformorethan1000yearsbeforethearrivalofEuropeans.FarfrombeingevolutionarilyretardedprehistoricAmazonianpeopledevelopedtechnologiesandculturesthatwereadvancedfortheirtime.IfthelivesofIndianstodayseem"primitive"theappearanceisnottheresultofsomeenvironmentaladaptationorecologicalbarrier;ratheritisacomparativelyrecentadaptationtocenturiesofeconomicandpoliticalpressure. 44._______________ TheevidenceforarevisedviewofAmazoniawilltakemanypeoplebysurprise.Ecologistshaveassumedthattropicalecosystemswereshapedentirelybynaturalforcesandtheyhavefocusedtheirresearchonhabitatstheybelievehaveescapedhumaninfluence.ButastheUniversityofFloridaecologistPeterFeinsingerhasnotedanapproachthatleavespeopleoutoftheequationisnolongertenable.ThearchaeologicalevidenceshowsthatthenaturalhistoryofAmazoniaistoasurprisingextenttiedtotheactivitiesofitsprehistoricinhabitants. 45._______________ Therealizationcomesnonetoosoon.InJune1992politicalandenvironmentalleadersfromacrosstheworldmetinRiodeJaneirotodiscusshowdevelopingcountriescanadvancetheireconomieswithoutdestroyingtheirnaturalresources.ThechallengeisespeciallydifficultinAmazonia.Becausethetropicalforesthasbeendepictedasecologicallyunfitforlarge-scalehumanoccupationsomeenvironmentalistshaveopposeddevelopmentofanykind.Ironicallyonemajorcasualtyofthatextremepositionhasbeentheenvironmentitself.Whilepolicymakersstruggletodefineandimplementappropriatelegislationdevelopmentofthemostdestructivekindhascontinuedapaceovervastareas. Theothermajorcasualtyofthe"naturalism"ofenvironmentalscientistshasbeentheindigenousAmazonianswhosehabitsofhuntingfishingandslash-and-burncultivationoftenhavebeenrepresentedasharmfultothehabitat.IntheclashbetweenenvironmentalistsanddeveloperstheIndianshavesufferedthemost.Thenewunderstandingofthepre-historyofAmazoniahoweverpointstowardamiddleground.Archaeologymakesclearthatwithjudiciousmanagementselectedpartsoftheregioncouldsupportmorepeoplethananyonethoughtbefore.Thelong-buriedpastitseemsoffershopeforthefuture. [A]Assumedinhospitablenessto.socialdevelopment [B]Pricepaidformisconceptions [C]Evolutionaryadaptationtoforestecology [D]Falsebelievesrevised [E]Extremeimpoverishmentandbackwardness [F]Ignoranceofearlyhumanimpact 44
早在民主革命时期__就强调跳出中国历史上历代封建王朝兴衰周期律的新路是用
__思想对马克思主义关于统一战线理论的发展有
哈罗德的分析之所以是一种动态的分析是因为他
Text4 Virtuallyeverythingastronomersknowaboutobjectsoutsidethesolarsystemisbasedonthedetectionofphotons-quantaofelectromagneticradiation.Yetthereisanotherformofradiationthatpermeatestheuniverse:neutrinos.Withasitsnameimpliesnoelectricchargeandnegligiblemasstheneutrinointeractswithotherparticlessorarelythataneutrinocancrosstheentireuniverseeventraversingsubstantialaggregationsofmatterwithoutbeingabsorbedorevendeflected.Neutrinoscanthusescapefromregionsofspacewherelightandotherkindsofelectromagneticradiationareblockedbymatter.Notasinglevalidatedobservationofanextraterrestrialneutrinohas.sofarbeenproduceddespitetheconstructionofastringofelaborateobservatoriesmountedontheearthfromSouthernIndiatoUtahtoSouthAfrica.Howeverthedetectionofextraterrestrialneutrinosareofgreatsignificanceinthestudyofastronomy.Neutrinoscarrywiththeirinformationaboutthesiteandcircumstancesoftheirproduction;thereforethedetectionofcosmicneutrinoscouldprovidenewinformationaboutawidevarietyofcosmicphenomenaandaboutthehistoryoftheuniverse. Howcanscientistsdetectaparticlethatinteracts.soinfrequentlywithothermatterTwenty-fiveyearspassedbetweenPauli’shypothesisthattheneutrinoexistedanditsactualdetection;sincethenvirtuallyallresearchwithneutrinoshasbeenwithneutrinoscreatedartificiallyinlargeparticleacceleratorsandstudiedunderneutrinomicroscopes.Butaneutrinotelescopecapableofdetectingcosmicneutrinosisdifficulttoconstruct.Noapparatuscandetectneutrinosunlessitisextremelymassivebecausegreatmassissynonymouswithhugenumbersofnucleonsneutronsandprotonsandthemoremassivethedetectorthegreatertheprobabilityofoneofitsnucleon’sreactingwithaneutrino.Inadditiontheapparatusmustbesufficientlyshieldedfromtheinterferingeffectsofotherparticles. Fortunatelyagroupofastrophysicistshasproposedameansofdetectingcosmicneutrinosbyharnessingthemassoftheocean.NamedDUMANDforDeepUnderwaterMuonandNeutrinoDetectortheprojectcallsforplacinganarrayoflightsensorsatadepthoffivekilometersundertheoceansurface.Thedetectingmediumistheseawateritself:whenaneutrinointeractswithaparticleinanatomofseawatertheresultisacascadeofelectricallychargedparticlesandaflashoflightthatcanbedetectedbythesensors.Thefivekilometersofseawaterabovethesensorswillshieldthemfromtheinterferingeffectsofotherhigh-energyparticlesrainingdownthroughtheatmosphere. ThestrongestmotivationfortheDUMANDprojectisthatitwillexploitanimportantsourceofinformationabouttheuniverse.Theextensionofastronomyfromvisiblelighttoradiowavestox-raysandgammaraysneverfailedtoleadtothediscoveryofunusualobjectssuchasradiogalaxiesquasarsandpulsars.Eachofthesediscoveriescameasasurprise.Neutrinoastronomywilldoubtlesslybringitsownshareofsurprises. Fromthethirdparagraphbesidessheltertheseawaterisusedas
针对非公有制经济发展中的突出问题国务院颁布了关于鼓励支持和引导个体私营等非公有制经济发展的若干意见提出了一系列措施包括
在当今科学高度发展的时代还有人相信唯心主义这是由于
我国社会主义初级阶段的时间跨度是指
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorfsassertionthatsocialchangeexistseverywhere.Technologytheapplicationofknowledgeforpracticalendsisamajorsourceofsocialchange. Yetwewoulddowelltoremindourselvesthattechnologyisahumancreation;itdoesnotexistnaturally.Aspearorarobotisasmuchaculturalasaphysicalobject.46Untilhumansuseaspeartohuntgameorarobottoproducemachinepartsneitherismuchmorethanasolidmassofmatter.Forabirdlookingforanobjectonwhichtorestaspearorrobotservesthepurposeequallywell.TheexplosionoftheChallengerspaceshuttleandtheRussiannuclearaccidentatChernobyldrivehomethehumanqualityoftechnology:theyprovidecasesinwhichwell-plannedsystemssuddenlygotintoamessandtherewasnoreadyhandtosetthemright.Sincetechnologyisahumancreationweareresponsibleforwhatisdonewithit.Pessimistsworrythatwewilluseourtechnologyeventuallytoblowourworldandourselvestopieces.Buttheyhavebeensayingthisfordecadesandsofarwehavemanagedtosurviveandevenflourish.Whetherwewillcontinuetodosointheyearsaheadremainsuncertain.Clearlytheimpactoftechnologyonourlivesdeservesacloserexamination. Fewtechnologicaldevelopmentshavehadagreaterimpactonourlivesthanthecomputerrevolution.Scientistsandengineershavedesignedspecializedmachinesthatcandothetasksthatonceonlypeoplecoulddo.47Therearethosewhoassertthattheswitchtoaninformation-basedeconomyisinthesamecampasothergreathistoricalmilestonesparticularlytheIndustrialRevolution. YetwhenweaskwhytheIndustrialRevolutionwasarevolutionwefindthatitwasnotthemachines.Theprimaryreasonwhyitwasrevolutionaryisthatitledtogreatsocialchange.48Itgaverisetomassproductionandthroughmassproductiontoasocietyinwhichwealthwasnotconfinedtothefew.49InsomewhatsimilarfashioncomputerspromisetorevolutionizethestructureofAmericanlifeparticularlyastheyfreethehumanmindandopennewpossibilitiesinknowledgeandcommunication. TheIndustrialRevolutionsupplementedandreplacedthemusclesofhumansandreplacedsomeaspectsofthemindofhumanbeingsbyelectronicmethods.50Itisthecapacityofthecomputerforsolvingproblemsandmakingdecisionsthatrepresentsitsgreatestpotentialandthatposesthegreatestdifficultiesinpredictingtheimpactonsociety. Itisthecapacityofthecomputerforsolvingproblemsandmakingdecisionsthatrepresentsitsgreatestpotentialandthatposesthegreatestdifficultiesinpredictingtheimpactonsociety.
2005年联合国改革的成果文件中表明联合国今后工作的重点
我国社会主义建设确定了三步走的战略目标其中第二步是指
2005年6月30日____在有关会议上强调必须加快建设
提高企业经济效益的基本要求是
Text4 Virtuallyeverythingastronomersknowaboutobjectsoutsidethesolarsystemisbasedonthedetectionofphotons-quantaofelectromagneticradiation.Yetthereisanotherformofradiationthatpermeatestheuniverse:neutrinos.Withasitsnameimpliesnoelectricchargeandnegligiblemasstheneutrinointeractswithotherparticlessorarelythataneutrinocancrosstheentireuniverseeventraversingsubstantialaggregationsofmatterwithoutbeingabsorbedorevendeflected.Neutrinoscanthusescapefromregionsofspacewherelightandotherkindsofelectromagneticradiationareblockedbymatter.Notasinglevalidatedobservationofanextraterrestrialneutrinohas.sofarbeenproduceddespitetheconstructionofastringofelaborateobservatoriesmountedontheearthfromSouthernIndiatoUtahtoSouthAfrica.Howeverthedetectionofextraterrestrialneutrinosareofgreatsignificanceinthestudyofastronomy.Neutrinoscarrywiththeirinformationaboutthesiteandcircumstancesoftheirproduction;thereforethedetectionofcosmicneutrinoscouldprovidenewinformationaboutawidevarietyofcosmicphenomenaandaboutthehistoryoftheuniverse. Howcanscientistsdetectaparticlethatinteracts.soinfrequentlywithothermatterTwenty-fiveyearspassedbetweenPauli’shypothesisthattheneutrinoexistedanditsactualdetection;sincethenvirtuallyallresearchwithneutrinoshasbeenwithneutrinoscreatedartificiallyinlargeparticleacceleratorsandstudiedunderneutrinomicroscopes.Butaneutrinotelescopecapableofdetectingcosmicneutrinosisdifficulttoconstruct.Noapparatuscandetectneutrinosunlessitisextremelymassivebecausegreatmassissynonymouswithhugenumbersofnucleonsneutronsandprotonsandthemoremassivethedetectorthegreatertheprobabilityofoneofitsnucleon’sreactingwithaneutrino.Inadditiontheapparatusmustbesufficientlyshieldedfromtheinterferingeffectsofotherparticles. Fortunatelyagroupofastrophysicistshasproposedameansofdetectingcosmicneutrinosbyharnessingthemassoftheocean.NamedDUMANDforDeepUnderwaterMuonandNeutrinoDetectortheprojectcallsforplacinganarrayoflightsensorsatadepthoffivekilometersundertheoceansurface.Thedetectingmediumistheseawateritself:whenaneutrinointeractswithaparticleinanatomofseawatertheresultisacascadeofelectricallychargedparticlesandaflashoflightthatcanbedetectedbythesensors.Thefivekilometersofseawaterabovethesensorswillshieldthemfromtheinterferingeffectsofotherhigh-energyparticlesrainingdownthroughtheatmosphere. ThestrongestmotivationfortheDUMANDprojectisthatitwillexploitanimportantsourceofinformationabouttheuniverse.Theextensionofastronomyfromvisiblelighttoradiowavestox-raysandgammaraysneverfailedtoleadtothediscoveryofunusualobjectssuchasradiogalaxiesquasarsandpulsars.Eachofthesediscoveriescameasasurprise.Neutrinoastronomywilldoubtlesslybringitsownshareofsurprises. Whichofthefollowingisthemostdesirablesitewherecosmicneutrinoscanbeeasilydetected
全面建设小康社会我国具备的有利条件如下
在资本主义条件下股份公司的产生和发展
In1942AllanRHolmbergadoctoralstudentinanthropologyfromYaleUniversityUSAventureddeepintothejungleofBolivianAmazoniaandsearchedoutanisolatedbandofSirionoIndians.TheresearcherdescribedtheprimitivesocietyasadesperatestraggleforsurvivalaviewofAmazoniabeingfundamentallyreconsideredtoday. 41._______________ TheSirionoHolmbergwroteleda"strikinglybackward"existence.Theirvillageswerelittlemorethanclustersofthatchedhuts.Lifeitselfwasaperpetualandpunishingsearchforfood:somefamiliesgrewmaniocandotherstarchycropsinsmallgardenplotsclearedfromtheforestwhileothermembersofthetribescouredthecountryforsmallgameandpromisingfishholes.Whenlocalresourcesbecamedepletedthetribemovedon.AsfortechnologyHolmbergnotedtheSiriono"maybeclassifiedamongthemosthandicappedpeoplesoftheworld".OtherthanbowsarrowsandcrudediggingstickstheonlytoolstheSiriono.seemedtopossesswere"twomachetesworntothesizeofpocket-knives". 42._______________ AlthoughthelivesoftheSirionohavechangedintheinterveningdecadestheimageofthemasStoneAgerelicshasendured.TocasualobserversaswellastoinfluentialnaturalscientistsandregionalplannerstheluxuriantforestsofAmazoniaseemagelessunconquerableahabitattotallyhostiletohumancivilization.TheapparentsimplicityofIndianwaysoflifehasbeenjudgedanevolutionaryadaptationtoforestecologylivingproofthatAmazoniacouldnot—andcannot—sustainamorecomplexsociety.Archaeologicaltracesoffarmoreelaboratecultureshavebeendismissedastheruinsofinvadersfromoutsidetheregionabandonedtodecayintheuncompromisingtropicalenvironment. 43._______________ ThepopularconceptionofAmazoniaanditsnativeresidentswouldbeenormouslyconsequentialifitweretrue.ButthehumanhistoryofAmazoniainthepast11000yearsbetraysthatviewasmyth.Evidencegatheredinrecentyearsfromanthropologyandarchaeologyindicatesthattheregionhassupportedaseriesofindigenousculturesforeleventhousandyears;anextensivenetworkofcomplexsocieties—somewithpopulationsperhapsaslargeas100000—thrivedthereformorethan1000yearsbeforethearrivalofEuropeans.FarfrombeingevolutionarilyretardedprehistoricAmazonianpeopledevelopedtechnologiesandculturesthatwereadvancedfortheirtime.IfthelivesofIndianstodayseem"primitive"theappearanceisnottheresultofsomeenvironmentaladaptationorecologicalbarrier;ratheritisacomparativelyrecentadaptationtocenturiesofeconomicandpoliticalpressure. 44._______________ TheevidenceforarevisedviewofAmazoniawilltakemanypeoplebysurprise.Ecologistshaveassumedthattropicalecosystemswereshapedentirelybynaturalforcesandtheyhavefocusedtheirresearchonhabitatstheybelievehaveescapedhumaninfluence.ButastheUniversityofFloridaecologistPeterFeinsingerhasnotedanapproachthatleavespeopleoutoftheequationisnolongertenable.ThearchaeologicalevidenceshowsthatthenaturalhistoryofAmazoniaistoasurprisingextenttiedtotheactivitiesofitsprehistoricinhabitants. 45._______________ Therealizationcomesnonetoosoon.InJune1992politicalandenvironmentalleadersfromacrosstheworldmetinRiodeJaneirotodiscusshowdevelopingcountriescanadvancetheireconomieswithoutdestroyingtheirnaturalresources.ThechallengeisespeciallydifficultinAmazonia.Becausethetropicalforesthasbeendepictedasecologicallyunfitforlarge-scalehumanoccupationsomeenvironmentalistshaveopposeddevelopmentofanykind.Ironicallyonemajorcasualtyofthatextremepositionhasbeentheenvironmentitself.Whilepolicymakersstruggletodefineandimplementappropriatelegislationdevelopmentofthemostdestructivekindhascontinuedapaceovervastareas. Theothermajorcasualtyofthe"naturalism"ofenvironmentalscientistshasbeentheindigenousAmazonianswhosehabitsofhuntingfishingandslash-and-burncultivationoftenhavebeenrepresentedasharmfultothehabitat.IntheclashbetweenenvironmentalistsanddeveloperstheIndianshavesufferedthemost.Thenewunderstandingofthepre-historyofAmazoniahoweverpointstowardamiddleground.Archaeologymakesclearthatwithjudiciousmanagementselectedpartsoftheregioncouldsupportmorepeoplethananyonethoughtbefore.Thelong-buriedpastitseemsoffershopeforthefuture. [A]Assumedinhospitablenessto.socialdevelopment [B]Pricepaidformisconceptions [C]Evolutionaryadaptationtoforestecology [D]Falsebelievesrevised [E]Extremeimpoverishmentandbackwardness [F]Ignoranceofearlyhumanimpact 42
物质资料生产方式所体现的关系是
安南在联大发表的大自由为人人共享发展安全和人权而奋斗报告中对联合国机构改革提出的建议包括
明代哲学家方以智说人物灵蠢多殊是曰独性而公性则一也公性在独性中逐缘习性这段话讲的是
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorfsassertionthatsocialchangeexistseverywhere.Technologytheapplicationofknowledgeforpracticalendsisamajorsourceofsocialchange. Yetwewoulddowelltoremindourselvesthattechnologyisahumancreation;itdoesnotexistnaturally.Aspearorarobotisasmuchaculturalasaphysicalobject.46Untilhumansuseaspeartohuntgameorarobottoproducemachinepartsneitherismuchmorethanasolidmassofmatter.Forabirdlookingforanobjectonwhichtorestaspearorrobotservesthepurposeequallywell.TheexplosionoftheChallengerspaceshuttleandtheRussiannuclearaccidentatChernobyldrivehomethehumanqualityoftechnology:theyprovidecasesinwhichwell-plannedsystemssuddenlygotintoamessandtherewasnoreadyhandtosetthemright.Sincetechnologyisahumancreationweareresponsibleforwhatisdonewithit.Pessimistsworrythatwewilluseourtechnologyeventuallytoblowourworldandourselvestopieces.Buttheyhavebeensayingthisfordecadesandsofarwehavemanagedtosurviveandevenflourish.Whetherwewillcontinuetodosointheyearsaheadremainsuncertain.Clearlytheimpactoftechnologyonourlivesdeservesacloserexamination. Fewtechnologicaldevelopmentshavehadagreaterimpactonourlivesthanthecomputerrevolution.Scientistsandengineershavedesignedspecializedmachinesthatcandothetasksthatonceonlypeoplecoulddo.47Therearethosewhoassertthattheswitchtoaninformation-basedeconomyisinthesamecampasothergreathistoricalmilestonesparticularlytheIndustrialRevolution. YetwhenweaskwhytheIndustrialRevolutionwasarevolutionwefindthatitwasnotthemachines.Theprimaryreasonwhyitwasrevolutionaryisthatitledtogreatsocialchange.48Itgaverisetomassproductionandthroughmassproductiontoasocietyinwhichwealthwasnotconfinedtothefew.49InsomewhatsimilarfashioncomputerspromisetorevolutionizethestructureofAmericanlifeparticularlyastheyfreethehumanmindandopennewpossibilitiesinknowledgeandcommunication. TheIndustrialRevolutionsupplementedandreplacedthemusclesofhumansandreplacedsomeaspectsofthemindofhumanbeingsbyelectronicmethods.50Itisthecapacityofthecomputerforsolvingproblemsandmakingdecisionsthatrepresentsitsgreatestpotentialandthatposesthegreatestdifficultiesinpredictingtheimpactonsociety. Itgaverisetomassproductionandthroughmassproductiontoasocietyinwhichwealthwasnotconfinedtothefew.
ToliveintheUnitedStatestodayistogainanappreciationforDahrendorfsassertionthatsocialchangeexistseverywhere.Technologytheapplicationofknowledgeforpracticalendsisamajorsourceofsocialchange. Yetwewoulddowelltoremindourselvesthattechnologyisahumancreation;itdoesnotexistnaturally.Aspearorarobotisasmuchaculturalasaphysicalobject.46Untilhumansuseaspeartohuntgameorarobottoproducemachinepartsneitherismuchmorethanasolidmassofmatter.Forabirdlookingforanobjectonwhichtorestaspearorrobotservesthepurposeequallywell.TheexplosionoftheChallengerspaceshuttleandtheRussiannuclearaccidentatChernobyldrivehomethehumanqualityoftechnology:theyprovidecasesinwhichwell-plannedsystemssuddenlygotintoamessandtherewasnoreadyhandtosetthemright.Sincetechnologyisahumancreationweareresponsibleforwhatisdonewithit.Pessimistsworrythatwewilluseourtechnologyeventuallytoblowourworldandourselvestopieces.Buttheyhavebeensayingthisfordecadesandsofarwehavemanagedtosurviveandevenflourish.Whetherwewillcontinuetodosointheyearsaheadremainsuncertain.Clearlytheimpactoftechnologyonourlivesdeservesacloserexamination. Fewtechnologicaldevelopmentshavehadagreaterimpactonourlivesthanthecomputerrevolution.Scientistsandengineershavedesignedspecializedmachinesthatcandothetasksthatonceonlypeoplecoulddo.47Therearethosewhoassertthattheswitchtoaninformation-basedeconomyisinthesamecampasothergreathistoricalmilestonesparticularlytheIndustrialRevolution. YetwhenweaskwhytheIndustrialRevolutionwasarevolutionwefindthatitwasnotthemachines.Theprimaryreasonwhyitwasrevolutionaryisthatitledtogreatsocialchange.48Itgaverisetomassproductionandthroughmassproductiontoasocietyinwhichwealthwasnotconfinedtothefew.49InsomewhatsimilarfashioncomputerspromisetorevolutionizethestructureofAmericanlifeparticularlyastheyfreethehumanmindandopennewpossibilitiesinknowledgeandcommunication. TheIndustrialRevolutionsupplementedandreplacedthemusclesofhumansandreplacedsomeaspectsofthemindofhumanbeingsbyelectronicmethods.50Itisthecapacityofthecomputerforsolvingproblemsandmakingdecisionsthatrepresentsitsgreatestpotentialandthatposesthegreatestdifficultiesinpredictingtheimpactonsociety. Untilhumansuseaspeartohuntgameorarobottoproducemachinepartsneitherismuchmorethanasolidmassofmatter
下面是20世纪二三十年代中国__关于革命道路问题的几组材料材料1①乡村是统治阶级的四肢城市才是他们的头脑与心腹单只斩断了他的四肢而没有斩断他的头脑炸裂他的心腹还不能致他的最后的命——摘自李立三新的革命高潮前面的诸问题1930年6月②有人以为中国像西欧各国一样大城市的经济力量可以统治全国所以大城市暴动成功以后可以影响小城市及乡村而在中国则找不到一个大城市的经济力量能统治全国的——摘自中共六届二中全会的政治问题报告1929年6月③中国豪绅资产阶级因为资本主义发展的落后不能成为一个整个儿阶级势力他们内部分裂冲突而没有组织全国家中央集权政府的能力因此革命不能有夺取首都一击而中的发展形势摘自瞿秋白武装暴动的问题1927年12月材料2①不要城市就是否认__是无产阶级政党就是否认无产阶级对农民的领导结果__只有变成小资产阶级农民党你们在斗争的布置上有用乡村包围城市的企图这种倾向是极危险的——摘自中__致湖北省委信1929年2月②红军游击队和红色区域的建立和发展是半殖民地中国在无产阶级领导之下的农民斗争的最高形式和半殖民地农民斗争发展的必然结果并且无疑义的是促进全国革命高潮的最重要因素——摘自__星星之火可以燎原1930年1月③现在就全国看来农__动的发展比较城市的工人运动要快得多在这一种情势之下若我们依然是将大部分的力量都用在城市中实不如用在农村中为好革命势力占据了广大农村之后可以结合起来包围城市封锁城市用广大的农村革命势力向城市进攻必然可以得着胜利——摘自中__机关刊物红旗1930年5月④以为不要城市工人而用农村包围城市可以取得胜利这无论在理论上与事实上都是不通的假使没有城市做领导则任何乡村都是不能联合起来的并且没有城市工人激烈斗争则一切包围城市的计划完全是空谈——摘自中__机关刊物红旗1930年5月24日材料3如果革命的队伍不愿意和帝国主义及其走狗妥协而要坚持地奋斗下去如果革命的队伍要准备积蓄和锻炼自己的力量并避免在力量不够的时候和强大的敌人作决定胜负的战斗那就必须把落后的农村造成先进的巩固的根据地造成军事上政治上经济上文化上的伟大的革命阵地借以反对利用城市进攻农村区域的凶恶敌人借以在长期战斗中逐步地争取革命的全部胜利——摘自__选集第2卷人民出版社1991年版第621页请回答1分析材料1说明近代中国社会城乡关系的特点及其原因2阅读材料2分析材料中的不同观点及其分歧的实质3综合材料123指出中国革命新道路的客观依据和革命新道路理论的基本点
热门题库
更多
高考生物
高考政治
高考历史
国家统考科目
香港法概论
反间谍法
__学
合同法
证据学
民事诉讼法学
民法学
刑法学
消费者权益保护法
法理学
竞争法
国际公法