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如果待排序序列中两个数据元素具有相同的值，在排序后它们的位置发生颠倒，则称该排序是不稳定的。下列不稳定的排序方法是（）。
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如果待排序序列中两个数据元素具有相同的值在排序后它们的位置发生颠倒则称该排序是不稳定的下列不稳定的排
冒泡排序
归并排序
直接插入排序
直接选择排序
如果待排序序列中两个元素具有相同的值在排序前后它们的相互位置发生颠倒则称该排序算法是不稳定的是稳定的
冒泡排序
希尔排序
快速排序
简单选择排序
如果待排序中两个数据元素具有相同的值在排序后它们的相互位置发生颠倒则称该排序算法不稳定40就是不稳定
冒泡排序
归并排序
直接插入排序
Shell排序
如果待排序序列中两个元素具有相同的值在排序前后它们的相互位置发生颠倒则称该排序算法是不稳定的____
冒泡排序
希尔排序
快速排序
简单选择排序
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Microwavecommunicationuseshigh-frequency56wavesthattravelinstraightlinesthroughtheair.Becausethewavescannot57withthecurvatureoftheearththeycanbe58onlyovershortdistance.Thusmicrowaveisagood59forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansofdishesor60.Thesecanbeinstalledontowershighbuildingsandmountaintops.
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51isasixbytesOSIlayer2addresswhichisburnedintoeverynetworkingdevicethatprovidesitsuniqueidentityforpointtopointcommunication.52isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols.53functionswithtwolayersofprotocols.Itcanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands.54isthepopularLANdevelopedunderthedirectionoftheIEEE802.5.55isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI.
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Packet-switchingwirelessnetworksarepreferable71whentransmissionsare72becauseofthewaychargesare73perpacket.Circuit-switchednetworksarepreferablefortransferringlargefilesorforotherlengthytransmissionsbecausecustomersare74forthe75oftimetheyusethenetwork.
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SpreadspectrumsimplymeansthatdataissentinsmallpiecesOveranumberofthe46frequenciesavailableforuseatanytimeinthespecifiedrange.Devicesusing47spreadspectrumDSSScommunicateby48eachbyteofdataintoseveralpartsandsendingthemconcurrentlyondifferent49.DSSSusesalotoftheavailable50about22megahertzMHz.
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41isaprotocolthatahostusestoinformarouterwhenitjoinsorleavesanInternetmulticastgroup.42isanerrordetectioncodethatmostdatacommunicationnetworksuse.43isaninteriorgatewayprotocolthatusesadistancevectoralgorithmtopropagateroutinginformation.44isatransfermodeinwhichalltypesofinformationareorganizedintofixedformcellsonanasynchronousornon-periodicbasisoverarangeofmedia.45isanidentifierofawebpage.
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Networkscanbeinterconnectedbydifferentdevices.Inthephysicallayernetworkscanbeconnectedby31orhubswhichjustmovethebitsfromonenetworktoanidenticalnetwork.Onelayerupwefindbridgesandswitcheswhichoperateatdatalinklayer.Theycanaccept32examinetheMACaddressandforwardtheframestoadifferentnetworkwhiledoingminorprotocoltranslationintheprocess.Innetworklayerwehaveroutersthatcanconnecttwonetworks.Iftwonetworkshave33networklayerthemutermaybeabletotranslatebetweenthepackerformats.Inthetransportlayerwefindtransportgatewaywhichcaninterfacebetweentwotransportconnections.Finallyintheapplicationlayerapplicationgatewaystranslatemessage34.AsanexamplegatewaysbetweenInternete-mailandX.400e-mailmust35thee-mailmessageandchangevariousheaderfields.
Asocketisbasicallyanendpointofacommunicationlinkbetweentwoapplications.Socketsthatextendoveranetworkconnecttwoormoreapplicationsrunningoncomputersattachedtothenetwork.Asockettwoaddresses:.Socketsprovideacommunicationchannelbetweenoneormoresystems.TherearesocketsseparatelyusingTCPandUDP.
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OpenShortestPathFirstOSPFisa66routingalgorithmthat67workdoneontheOSIIS-ISintradomainroutingprotocol.Thisroutingascomparedtodistance-vectorroutingrequires68processingpower.The69algorithmisusedtocalculateroutes.OSPFroutingtableupdatesonlytakeplacewhennecessary70atregularintervals.
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Thepurposeoftherequirementsdefinitionphaseistoproduceaclearcompleteconsistentandtestable36ofthetechnicalrequirementsforthesoftwareproduct.Duringtherequirementsdefinitionphasetherequirementsdefinitionteamusesaninterativeprocesstoexpandabroadstatementofthesystemrequirementsintoacompleteanddetailedspecificationofeachfunctionthatthesoftwaremustperformandeach37thatitmustmeet.Thestartingpointisusuallyasetofhighlevelrequirementsfromthe38thatdescribetheprojectorproblem.Ineithercasetherequirementsdefinitionteamformulatesanoverallconceptfor’thesystemandthendefines39showinghowthesystemwillbeoperatedpublishesthesystemandoperationsconceptdocumentandconductsasystemconceptreviewSCR.FollowingtheSCRtheteamderives40requirementsforthesystemfromthehighlevelrequirementsandthesystemandoperationsconceptusingstructuredorobject-orientedanalysis.Theteamspecifiesthesoftwarefunctionsandalgorithmsneededtosatisfyeachdetailedrequirement.
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对有14个数据元素的有序表R-14]进行二分法查找查找到R[3]的关键码等于给定值此时元素比较顺序依次为
MelissaandLoveLettermadeuseofthetrustthatexistsbetweenfriendsorcolleagues.Imaginereceivingan26fromafriendwhoasksyoutoopenit.ThisiswhathappenswithMelissaandseveralothersimilaremail27.Uponrunningsuchwormsusuallyproceedtosendthemselvesouttoemailaddressesfromthevictim’saddressbookpreviousemailswebpages28.Asadministratorsseektoblockdangerousemailattachmentsthroughtherecognitionofwell-known29viruswritersuseotherextensionstocircumventsuchprotection.Executable.exefilesarerenamedto.batand.cmdplusawholelistofotherextensionsandwillstillrunandsuccessfullyinfecttargetusers.Frequentlyhackerstrytopenetratenetworksbysendinganattachmentthatlookslikeaflashmoviewhichwhiledisplayingsomecuteanimationsimultaneouslyrunscommandsinthebackgroundtostealyourpasswordsandgivethe30accesstoyournetwork.
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