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阅读以下说明、图和C代码，将应填入 (n) 处的字句写在对应栏内。 [说明] 一般的树结构常采用孩子一兄弟表示法表示，即用二叉链表作为树的存储结构，链表中结点的两个链域分别指向该结点的第...
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SOCKSisageneticproxyprotocolforTCP/IP-basednetworkingapplications.SOCKSincludestwo21theSOCKSserverandtheSOCKSclient.TheSOCKSserverisimplementedattheapplicationlayer.TheSOCKSclientisimplementedbetweenapplicationsandthe22layer.WhenanapplicationclientneedstoconnecttoanapplicationservertheclientconnectstoaSOCKSproxyserver.Theproxyserverconnectstotheapplicationserverinsteadoftheclientand23databetweentheclientandtheapplicationserver.Fortheapplicationservertheproxyserveristhe24.SOCKSisalsooneofthepopular25tonetworkfirewalls.BecauseofitssimplicityandflexibilitySOCKShasbeenusedasgeneticapplicationproxyinvirtualprivatenetworkVPNandforextranetapplications.
Networkscanbeinterconnectedbydifferentdevices.Inthephysicallayernetworkscanbeconnectedby41orhubswhichjustmovethebitsfromonenetworktoanidenticalnetwork.Onelayerupwefindbridgesandswitcheswhichoperateatdatalinklayer.Theycanaccept42examinetheMACaddressandforwardtheframestoadifferentnetworkwhiledoingminorprotocoltranslationintheprocess.Inthenetworklayerwehaveroutersthatcanconnecttwonetworks.Iftwonetworkshave43networklayertheroutermaybeabletotranslatebetweenthepacketformats.Inthetransportlayerwefindtransportgatewaywhichcaninterfacebetweentwotransportconnections.Finallyintheapplicationlayerapplicationgatewaystranslatemessage44.AsanexamplegatewaysbetweenInternetE-mailandX.400E-mailmust45theE-mailmessageandchangevariousheaderfields.
Thepurposeoftherequirementsdefinitionphaseistoproduceaclearcompleteconsistentandtestable46ofthetechnicalrequirementsforthesoftwareproduct.Duringtherequirementsdefinitionphasetherequirementsdefinitionteamusesaniterativeprocesstoexpandabroadstatementofthesystemrequirementsintoacompleteanddetailedspecificationofeachfunctionthatthesoftwaremustperformandeach47thatitmustmeet.Thestartingpointisusuallyasetofhigh-levelrequirementsfromthe48thatdescribetheprojectorproblem.Ineithercasetherequirementsdefinitionteamformulatesanoverallconceptforthesystemandthendefines49showinghowthesystemwillbeoperatedpublishesthesystemandoperationsconceptdocumentandconductsasystemconceptreviewSCR.FollowingtheSCRtheteamderives50requirementsforthesystemfromthehigh-levelrequirementsandthesystemandoperationsconcept.Usingstructuredorobject-orientedanalysistheteamspecifiesthesoftwarefunctionsandalgorithmsneededtosatisfyeachdetailedrequirement.
介质故障恢复采用的操作有装载数据备份执行REDO操作执行UNDO操作其正确的操作步骤是用A＞B表示A的执行顺序先于B
Traditionalstructuredanalysistechniquesfocusupontheflowof36withinasystem.Object-orientedanalysisemphasizesthebuildingofreal-worldmodels.Itexaminesrequirementsfromtheperspectiveoftheclassesandobjectsfoundinthevocabularyofthe37domain.Traditionalsystemdesignmethodemphasizestheproperandeffectivestructureofacomplexsystem.Object-orienteddesignmethodencompassestheprocessofobject-orienteddecompositionanda38fordepictingbothlogicalandphysicalaswellasstaticanddynamicmodelsofthesystemunderdesign.Object-orientedprogrammingisamethodofimplementationinwhichprogramsareorganizedascooperativecollectionsofobjectseachofwhichrepresentsan39ofsomeclassandwhoseclassesareallmembersofahierarchyofclassesunitedvia40relationships.
31dataeffectivelyiscrucialforsuccessintoday’scompetitiveenvironment.Managersmustknowhowtouseavarietyoftools.Integrateddatatakesinformationfromdifferentsourcesandputsittogetherinameaningfulandusefulway.Oneofthedifficultiesofthisisthe32inhardwareandsoftware.33integrationusesabasedocumentthatcontainscopiesofotherobjects.34integrationusesabasedocumentthatcontainsthecurrentormostrecentversionofthesourcedocumentitcontains.35providesanoverviewoftheprogramwritteninplainEnglishwithoutthecomputersyntax.
Atypical11languagecontainsanapplicativesub-languagewhichapproximatesthemathematicalabstractionsoftimelessfunctionsappliedtospaceless’valueswheretheactualoperationsequencesanduseofstoragespaceduringexpressionevaluationareorganizedbehindthe12.Inthissettingvaluesaredatastructuresoflowvolumetypicallyafewcomputerwordsorlesswhichmeansthatanillusionofspacelessnesscanberealizedbyhaving13resultsduringexpressionevaluationstoredatthediscretionofthelanguageimplementationandeffectingparameter14and15operationsthroughvaluecopying.
SOCKSisageneticproxyprotocolforTCP/IP-basednetworkingapplications.SOCKSincludestwo21theSOCKSserverandtheSOCKSclient.TheSOCKSserverisimplementedattheapplicationlayer.TheSOCKSclientisimplementedbetweenapplicationsandthe22layer.WhenanapplicationclientneedstoconnecttoanapplicationservertheclientconnectstoaSOCKSproxyserver.Theproxyserverconnectstotheapplicationserverinsteadoftheclientand23databetweentheclientandtheapplicationserver.Fortheapplicationservertheproxyserveristhe24.SOCKSisalsooneofthepopular25tonetworkfirewalls.BecauseofitssimplicityandflexibilitySOCKShasbeenusedasgeneticapplicationproxyinvirtualprivatenetworkVPNandforextranetapplications.
MIMDsystemscanbeclassifiedinto1-orientedsystemshigh-availabilitysystemsandresponse-orientedsystems.Thegoalof1-orientedmultiprocessingistoobtainhigh12minimalcomputingcost.Thetechniquesemployedbymultiprocessoroperatingsystemstoachievethisgoaltakeadvantageofaninherentprocessingversusinput/outputbalanceintheworkloadtoproduce3and4loadingofsystem5
DOMisaplatformandlanguage-51APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented52.DOMisa53-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin54whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge55documentsthatdonotfitinfothememoryavailableforprocessing.
31dataeffectivelyiscrucialforsuccessintoday’scompetitiveenvironment.Managersmustknowhowtouseavarietyoftools.Integrateddatatakesinformationfromdifferentsourcesandputsittogetherinameaningfulandusefulway.Oneofthedifficultiesofthisisthe32inhardwareandsoftware.33integrationusesabasedocumentthatcontainscopiesofotherobjects.34integrationusesabasedocumentthatcontainsthecurrentormostrecentversionofthesourcedocumentitcontains.35providesanoverviewoftheprogramwritteninplainEnglishwithoutthecomputersyntax.
MIMDsystemscanbeclassifiedinto1-orientedsystemshigh-availabilitysystemsandresponse-orientedsystems.Thegoalof1-orientedmultiprocessingistoobtainhigh12minimalcomputingcost.Thetechniquesemployedbymultiprocessoroperatingsystemstoachievethisgoaltakeadvantageofaninherentprocessingversusinput/outputbalanceintheworkloadtoproduce3and4loadingofsystem5
Atypical11languagecontainsanapplicativesub-languagewhichapproximatesthemathematicalabstractionsoftimelessfunctionsappliedtospaceless’valueswheretheactualoperationsequencesanduseofstoragespaceduringexpressionevaluationareorganizedbehindthe12.Inthissettingvaluesaredatastructuresoflowvolumetypicallyafewcomputerwordsorlesswhichmeansthatanillusionofspacelessnesscanberealizedbyhaving13resultsduringexpressionevaluationstoredatthediscretionofthelanguageimplementationandeffectingparameter14and15operationsthroughvaluecopying.
事务T1T2和T3按如下调度方式并发地对数据项XYZ进行访问假设XYZ的初值分别为X=200Y=300Z=500 ①在事务T2刚完成提交后数据中XYZ的值各是多少 ②当事务T3结束后XYZ的值各是多少
AWebbrowserissimplyaterminalemulatordesignedtodisplaytextonascreen.ThetwoessentialdifferencesbetweenanordinaryterminalemulatorandaWebbrowserarethatthebrowserknowshowtodealwith26andthatithasamechanismfor27graphicalfiles.Displaytextdisplaygraphicsand28hyperlinks-there’s99percentofthe29value.That’snottosaythatthemanufacturersdidn’tgoall-outtoattachahyperactiveefflorescenceofuselesscapabilitiesontotheirbrowsers.Rememberwhenmediachannelsinthebrowserwereabigdealinsteadoftheclutteryoucan’twaittodeletefromyourfavoritesofbookmarksmenuRememberwhenclient-sideJavaappletsweresupposedtobecomethepreferred30forapplicationdevelopmentRememberframesandalltheirnastysideeffects
Mostcomputersystemsare16totwodifferentgroupsofattacks:Insiderattacksandoutsiderattacks.Asystemthatisknowntobe17toanoutsiderattackbypreventing.18fromoutsidecanstillbevulnerabletotheinsiderattacksaccomplishedbyabusiveusageof19users.Detectingsuchabusiveusageaswellasattacksbyoutsidesnotonlyprovidesinformationondamageassessmentbutalsohelpstopreventfutureattacks.Theseattacksareusually20bytoolsreferredtoasIntrusionDetectionSystems.
AWebbrowserissimplyaterminalemulatordesignedtodisplaytextonascreen.ThetwoessentialdifferencesbetweenanordinaryterminalemulatorandaWebbrowserarethatthebrowserknowshowtodealwith26andthatithasamechanismfor27graphicalfiles.Displaytextdisplaygraphicsand28hyperlinks-there’s99percentofthe29value.That’snottosaythatthemanufacturersdidn’tgoall-outtoattachahyperactiveefflorescenceofuselesscapabilitiesontotheirbrowsers.Rememberwhenmediachannelsinthebrowserwereabigdealinsteadoftheclutteryoucan’twaittodeletefromyourfavoritesofbookmarksmenuRememberwhenclient-sideJavaappletsweresupposedtobecomethepreferred30forapplicationdevelopmentRememberframesandalltheirnastysideeffects
Traditionalstructuredanalysistechniquesfocusupontheflowof36withinasystem.Object-orientedanalysisemphasizesthebuildingofreal-worldmodels.Itexaminesrequirementsfromtheperspectiveoftheclassesandobjectsfoundinthevocabularyofthe37domain.Traditionalsystemdesignmethodemphasizestheproperandeffectivestructureofacomplexsystem.Object-orienteddesignmethodencompassestheprocessofobject-orienteddecompositionanda38fordepictingbothlogicalandphysicalaswellasstaticanddynamicmodelsofthesystemunderdesign.Object-orientedprogrammingisamethodofimplementationinwhichprogramsareorganizedascooperativecollectionsofobjectseachofwhichrepresentsan39ofsomeclassandwhoseclassesareallmembersofahierarchyofclassesunitedvia40relationships.
31dataeffectivelyiscrucialforsuccessintoday’scompetitiveenvironment.Managersmustknowhowtouseavarietyoftools.Integrateddatatakesinformationfromdifferentsourcesandputsittogetherinameaningfulandusefulway.Oneofthedifficultiesofthisisthe32inhardwareandsoftware.33integrationusesabasedocumentthatcontainscopiesofotherobjects.34integrationusesabasedocumentthatcontainsthecurrentormostrecentversionofthesourcedocumentitcontains.35providesanoverviewoftheprogramwritteninplainEnglishwithoutthecomputersyntax.
Networkscanbeinterconnectedbydifferentdevices.Inthephysicallayernetworkscanbeconnectedby41orhubswhichjustmovethebitsfromonenetworktoanidenticalnetwork.Onelayerupwefindbridgesandswitcheswhichoperateatdatalinklayer.Theycanaccept42examinetheMACaddressandforwardtheframestoadifferentnetworkwhiledoingminorprotocoltranslationintheprocess.Inthenetworklayerwehaveroutersthatcanconnecttwonetworks.Iftwonetworkshave43networklayertheroutermaybeabletotranslatebetweenthepacketformats.Inthetransportlayerwefindtransportgatewaywhichcaninterfacebetweentwotransportconnections.Finallyintheapplicationlayerapplicationgatewaystranslatemessage44.AsanexamplegatewaysbetweenInternetE-mailandX.400E-mailmust45theE-mailmessageandchangevariousheaderfields.
Atypical11languagecontainsanapplicativesub-languagewhichapproximatesthemathematicalabstractionsoftimelessfunctionsappliedtospaceless’valueswheretheactualoperationsequencesanduseofstoragespaceduringexpressionevaluationareorganizedbehindthe12.Inthissettingvaluesaredatastructuresoflowvolumetypicallyafewcomputerwordsorlesswhichmeansthatanillusionofspacelessnesscanberealizedbyhaving13resultsduringexpressionevaluationstoredatthediscretionofthelanguageimplementationandeffectingparameter14and15operationsthroughvaluecopying.
SoonmoreoftheinformationwereceiveviatheInternetcouldcome6indigitalwrappers.Wrappersaremadeup7softwarecodethat’stargetedtodospecificthingswiththedata8withinthemsuchashelpingtodefinequeriesforsearchengines.Theyalsokeep9from10accesstothatcode.
Networkscanbeinterconnectedbydifferentdevices.Inthephysicallayernetworkscanbeconnectedby41orhubswhichjustmovethebitsfromonenetworktoanidenticalnetwork.Onelayerupwefindbridgesandswitcheswhichoperateatdatalinklayer.Theycanaccept42examinetheMACaddressandforwardtheframestoadifferentnetworkwhiledoingminorprotocoltranslationintheprocess.Inthenetworklayerwehaveroutersthatcanconnecttwonetworks.Iftwonetworkshave43networklayertheroutermaybeabletotranslatebetweenthepacketformats.Inthetransportlayerwefindtransportgatewaywhichcaninterfacebetweentwotransportconnections.Finallyintheapplicationlayerapplicationgatewaystranslatemessage44.AsanexamplegatewaysbetweenInternetE-mailandX.400E-mailmust45theE-mailmessageandchangevariousheaderfields.
MIMDsystemscanbeclassifiedinto1-orientedsystemshigh-availabilitysystemsandresponse-orientedsystems.Thegoalof1-orientedmultiprocessingistoobtainhigh12minimalcomputingcost.Thetechniquesemployedbymultiprocessoroperatingsystemstoachievethisgoaltakeadvantageofaninherentprocessingversusinput/outputbalanceintheworkloadtoproduce3and4loadingofsystem5
SoonmoreoftheinformationwereceiveviatheInternetcouldcome6indigitalwrappers.Wrappersaremadeup7softwarecodethat’stargetedtodospecificthingswiththedata8withinthemsuchashelpingtodefinequeriesforsearchengines.Theyalsokeep9from10accesstothatcode.
SOCKSisageneticproxyprotocolforTCP/IP-basednetworkingapplications.SOCKSincludestwo21theSOCKSserverandtheSOCKSclient.TheSOCKSserverisimplementedattheapplicationlayer.TheSOCKSclientisimplementedbetweenapplicationsandthe22layer.WhenanapplicationclientneedstoconnecttoanapplicationservertheclientconnectstoaSOCKSproxyserver.Theproxyserverconnectstotheapplicationserverinsteadoftheclientand23databetweentheclientandtheapplicationserver.Fortheapplicationservertheproxyserveristhe24.SOCKSisalsooneofthepopular25tonetworkfirewalls.BecauseofitssimplicityandflexibilitySOCKShasbeenusedasgeneticapplicationproxyinvirtualprivatenetworkVPNandforextranetapplications.
Thepurposeoftherequirementsdefinitionphaseistoproduceaclearcompleteconsistentandtestable46ofthetechnicalrequirementsforthesoftwareproduct.Duringtherequirementsdefinitionphasetherequirementsdefinitionteamusesaniterativeprocesstoexpandabroadstatementofthesystemrequirementsintoacompleteanddetailedspecificationofeachfunctionthatthesoftwaremustperformandeach47thatitmustmeet.Thestartingpointisusuallyasetofhigh-levelrequirementsfromthe48thatdescribetheprojectorproblem.Ineithercasetherequirementsdefinitionteamformulatesanoverallconceptforthesystemandthendefines49showinghowthesystemwillbeoperatedpublishesthesystemandoperationsconceptdocumentandconductsasystemconceptreviewSCR.FollowingtheSCRtheteamderives50requirementsforthesystemfromthehigh-levelrequirementsandthesystemandoperationsconcept.Usingstructuredorobject-orientedanalysistheteamspecifiesthesoftwarefunctionsandalgorithmsneededtosatisfyeachdetailedrequirement.
有会员表Table_CardCardIDCardNameScore表示会员的会员号会员名字以及积分建立会员卡积分在500～1000分的会员信息视图HY～Card并要求通过此视图修改会员卡表的信息时视图中仍然有这些会员的信息ASSELECT*FROMTable——CardWHERE
在SQLServer2000中某数据库中有角色Role和用户UserUser是Role角色的成员且只属于该角色先对Table表给Role只授予SELECT和DELETE权限并授予User对T表具有SELECTUPDATE和DENYDELETE权限则用户User对Table表可以执行的操作是
Mostcomputersystemsare16totwodifferentgroupsofattacks:Insiderattacksandoutsiderattacks.Asystemthatisknowntobe17toanoutsiderattackbypreventing.18fromoutsidecanstillbevulnerabletotheinsiderattacksaccomplishedbyabusiveusageof19users.Detectingsuchabusiveusageaswellasattacksbyoutsidesnotonlyprovidesinformationondamageassessmentbutalsohelpstopreventfutureattacks.Theseattacksareusually20bytoolsreferredtoasIntrusionDetectionSystems.
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