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数据库文件结构包括堆文件、索引文件和散列文件等几种形式，利用哈希函数实现对数据库快速访问的文件结构是（）。
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数据库文件结构有多种形式其中能够记录随机地存储在文件物理空间中而且新插入的记录存储在文件的末尾的文件
堆文件
顺序文件
散列文件
索引文件
数据库文件结构包括堆文件索引文件散列文件等几种形式利用哈希函数实现对数据库快速访问的文件结构是___
顺序文件
聚集文件
索引文件
散列文件
数据库文件结构有多种形式记录按照查找码值的升序或降序顺序排列存储的文件结构是______
堆文件
顺序文件
散列文件
索引文件
数据库文件结构有多种形式其中能够记录随机地存储在文件物理空间中而且新插入的记录存储在文件的末尾的文件
堆文件
顺序文件
散列文件
素引文件
一个VisualFoxPro数据库是由______组成的
数据库文件、数据库备注文件和表文件
数据库文件、数据库索引文件和表文件
数据库文件、数据库备注文件和数据库索引文件
数据库备注文件、数据库索引文件和表文件
数据库文件结构有多种形式存储了来自多个关系表的记录数据每个关系表对应文件中的一种记录类型的文件结构是
聚集文件
顺序文件
散列文件
索引文件
数据库文件结构有多种形式记录按照查找码值的升序或降序顺序排列存储的文件结构是______
堆文件
N序文件
散列文件
索引文件
数据库文件结构有多种形式利用哈希函数实现对数据库快速访问的文件结构是______
聚集文件
顺序文件
散列文件
索引文件
利用索引技术Indexing支持快速文件访问的文件组织和存取方法的文件结构是______
堆文件
聚集文件
索引文件
散列文件
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DOMisaplatform-andlanguage-1APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented2DOMisa3-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin4whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge5documentsthatdonotfitintothememoryavailableforprocessing.2
在选择多媒体数据压缩算法时需要综合考虑______
在获取与处理音频信号的过程中正确的处理顺序是______
Inlookingattheclassstructureofanentiresystemwemayfindthatitsinheritance1iseitherwideandshallownarrowanddeeporbalanced.Classstructuresthatarewideandshallowusuallyrepresentforestsof2classesthatcanbemixedandmatched.Classstructuresthatarenarrowanddeeprepresenttreesofclassesthatarerelatedbyacommonancestor.Thereareadvantagesanddisadvantagestoeachapproach.Forestsofclassesaremoreloosely3buttheymaynotexploitallthecommonalitythatexists.Treesofclassesexploitthiscommonalitysothatindividualclassesaresmallerthaninforests.Howevertounderstandaparticularclassitisusuallynecessarytounderstandthemeaningofalltheclassesitinheritsfromoruses.Thepropershapeofaclassstructureishighlyproblem-dependent.Wemustmakesimilartrade-offsamonginheritanceaggregationandusingrelation-ships.ForexampleshouldtheclassCarinheritcontainorusetheclassesnamedEngineandWheelInthiscasewesuggestthatan4relationshipismoreappropriatethaninheritancerelationship.MeyerstatesthatbetweentheclassAandB5isappropriateifeveryinstanceofBmayalsobeviewedasaninstanceofA.TheclientrelationshipisappropriatewheneveryinstanceofBsimplypossessesoneormoreattributesofA.Fromanotherperspectiveifthebehaviorofanobjectismorethanthesumofitsindividualpartsthencreatinganaggregationrelationshipratherthananinheritancerelationshipbetweentheappropriateclassesisprobablysuperior.1
多媒体应用需要对庞大的数据进行压缩常见的压缩编码方法可分为两大类一类是无损压缩法另一类是有损压缩法也称12属于无损压缩法1
VirtualizationisanapproachtoITthatpoolsandshares1sothatutilizationisoptimizedandsuppliesautomaticallymeetdemand.TraditionalITenvironmentsareoftensiloswherebothtechnologyandhuman2arealignedaroundanapplicationorbusinessfunction.Withavirtualized3peopleprocesses7andtechnologyarefocusedonmeetingservicelevels4isallocateddynamicallyresourcesareoptimizedandtheentireinfrastructureissimplifiedandflexible.Weofferabroadspectrumofvirtualization5thatallowscustomerstochoosethemostappropriatepathandoptimizationfocusfortheirITinfrastructureresources.1
Inlookingattheclassstructureofanentiresystemwemayfindthatitsinheritance1iseitherwideandshallownarrowanddeeporbalanced.Classstructuresthatarewideandshallowusuallyrepresentforestsof2classesthatcanbemixedandmatched.Classstructuresthatarenarrowanddeeprepresenttreesofclassesthatarerelatedbyacommonancestor.Thereareadvantagesanddisadvantagestoeachapproach.Forestsofclassesaremoreloosely3buttheymaynotexploitallthecommonalitythatexists.Treesofclassesexploitthiscommonalitysothatindividualclassesaresmallerthaninforests.Howevertounderstandaparticularclassitisusuallynecessarytounderstandthemeaningofalltheclassesitinheritsfromoruses.Thepropershapeofaclassstructureishighlyproblem-dependent.Wemustmakesimilartrade-offsamonginheritanceaggregationandusingrelation-ships.ForexampleshouldtheclassCarinheritcontainorusetheclassesnamedEngineandWheelInthiscasewesuggestthatan4relationshipismoreappropriatethaninheritancerelationship.MeyerstatesthatbetweentheclassAandB5isappropriateifeveryinstanceofBmayalsobeviewedasaninstanceofA.TheclientrelationshipisappropriatewheneveryinstanceofBsimplypossessesoneormoreattributesofA.Fromanotherperspectiveifthebehaviorofanobjectismorethanthesumofitsindividualpartsthencreatinganaggregationrelationshipratherthananinheritancerelationshipbetweentheappropriateclassesisprobablysuperior.3
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软件工程标准分类法GB/T15538—95是______标准
Inlookingattheclassstructureofanentiresystemwemayfindthatitsinheritance1iseitherwideandshallownarrowanddeeporbalanced.Classstructuresthatarewideandshallowusuallyrepresentforestsof2classesthatcanbemixedandmatched.Classstructuresthatarenarrowanddeeprepresenttreesofclassesthatarerelatedbyacommonancestor.Thereareadvantagesanddisadvantagestoeachapproach.Forestsofclassesaremoreloosely3buttheymaynotexploitallthecommonalitythatexists.Treesofclassesexploitthiscommonalitysothatindividualclassesaresmallerthaninforests.Howevertounderstandaparticularclassitisusuallynecessarytounderstandthemeaningofalltheclassesitinheritsfromoruses.Thepropershapeofaclassstructureishighlyproblem-dependent.Wemustmakesimilartrade-offsamonginheritanceaggregationandusingrelation-ships.ForexampleshouldtheclassCarinheritcontainorusetheclassesnamedEngineandWheelInthiscasewesuggestthatan4relationshipismoreappropriatethaninheritancerelationship.MeyerstatesthatbetweentheclassAandB5isappropriateifeveryinstanceofBmayalsobeviewedasaninstanceofA.TheclientrelationshipisappropriatewheneveryinstanceofBsimplypossessesoneormoreattributesofA.Fromanotherperspectiveifthebehaviorofanobjectismorethanthesumofitsindividualpartsthencreatinganaggregationrelationshipratherthananinheritancerelationshipbetweentheappropriateclassesisprobablysuperior.5
DOMisaplatform-andlanguage-1APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented2DOMisa3-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin4whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge5documentsthatdonotfitintothememoryavailableforprocessing.4
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以下文件扩展名中______不是视频文件格式
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在UML中组成了UML的最基本的元素事务代表要定义的所有事务的层是
NAC’sNetworkAccessControlroleistorestrictnetworkaccesstoonlycompliantendpointsand1users.HoweverNACisnotacompleteLAN2solution;additionalproactiveand3securitymeasuresmustbeimplemented.NevisisthefirstandonlycomprehensiveLANsecuritysolutionthatcombinesdeepsecurityprocessingofeverypacketat100Gbpsensuringahighlevelofsecurityplusapplicationavailabilityandperformance.NevisintegratesNACasthefirstlineofLANsecurity4InadditiontoNACenterprisesneedtoimplementrole--basednetworkaccesscontrolaswellascriticalproactivesecuritymeasures-real-timemultilevel5inspectionandmicrosecondthreatcontainment.5
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