火焰原子吸收光度法测定时,氘灯背景校正适合的校正波长范围为()nm。
A. 100-200
B. 220-350
C. 200-500
D. 400-800
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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
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.