原子蒸气受具有特征波长的光源照射后，其中一些自由原子被激发跃迁至较高能态，然后以直接跃迁形式回复到基态，当激发辐射的波长与所产生的荧光波长相同时，这种荧光称为（）。
A. 敏化荧光
B. 直跃线荧光
C. 阶跃线荧光
D. 共振荧光
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WhichofthesebestdescribestheactionstakenwhenaVTPmessageisreceivedonaswitchconfiguredwiththeVTPmode"transparent"？（）
A. VTPupdatesareignoredandforwardedoutallports.
B. VTPupdatesareignoredandforwardedouttrunksonly.
C. VTPupdatesaremadetotheVLANdatabaseandareforwardedouttrunksonly.
D. VTPupdatesareignoredandarenotforwarded.
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。
A. 基体
B. 光谱
C. 电离
D. 化学
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
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