火焰原子吸收光度法测定水中钾和钠时，加入铯盐的目的是为了消除（）干扰。
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YourcompanyisresearchinganewapplicationthatrunsoverIPv6，butpartofitmuststillhaveIPv4support.YourcompanyusesatraditionalIPv4network.YourplanisnottorunIPv6overthewholenetwork，buttosegmentpartsofthenetworkoreventooperatesimultaneouslywithIPv6andIPv4.YoumustmakeabriefpresentationaboutIPv6technologytotheboardoftechnicaldirectors.Whichthreeoftheseitemscouldbepartofyourpresentation？（）
A. TunnelIPv6overIPv4toconnectfar-endIPv6networks.
B. ExplainwhyconfiguringIPv4andIPv6atthesametimeoverthesameLANinterfaceisnotpossible.
C. ExplainwhyconfiguringIPv4andIPv6atthesametimeoverthesameLANinterfaceispossible.
D. WhatisthemeaningofEUI-64andhowdoesitwork？
E. TunnelIPv4overIPv6toconnectfar-endIPv4networks.
WhichtwostatementsaboutMPLSpoint-to-multipointtrafficengineering（P2MPTE）aretrue？（）
A. P2MPTEusesanOSPFextensionthatisdifferentfromtheOSPFextensionthatisusedinP2PTE
B. LoosepathisnotsupportedinP2MPTE
C. MultipleIPmulticastgroupscanmaptooneP2MPtunnel
D. AffinityisnotsupportedinP2MPTE
E. P2MPTEusesConstrainedShortestPathFirst（CSPF）tocalculatepaths
Whentroubleshootinganetwork，theoutputofthecommandshowinterfacesindicatesalargenumberofrunts.Whatisarunt？（）
A. thenumberofpacketsthatarediscardedbecausetheyexceedthemaximumpacketsizeofthemedium
B. errorscreatedwhentheCRCgeneratedbytheoriginatingLANstationorfar-enddevicedoesnotmatchthechecksumcalculatedfromthedatareceived.
C. thenumberofpacketsthatarediscardedbecausetheyaresmallerthantheminimumpacketsizeofthemedium
D. thenumberofreceivedpacketsthatwereignoredbytheinterfacebecausetheinterfacehardwareranlowoninternalbuffers
E. thenumberoftimesthattheinterfacerequestedanotherinterfacewithintheroutertoslowdown
火焰原子吸收光度法测定水中镍时，使用（）火焰。
A. 空气-乙炔贫燃
B. 空气-乙炔富燃
C. 氧化亚氮-乙炔
D. 空气-氩气
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