气相色谱法测定烷基汞时,消除干扰物质对色谱柱的影响,主要是定期向色谱柱内注入()。
A. 饱和二氯化汞溶液
B. 饱和氯化钾溶液
C. 饱和氯化钠溶液
D. 二氯化汞苯饱和溶液
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WhichNetFlowversionshouldbeusedtocollectaccountingdataforIPv6traffic?()
A. version1
B. version5
C. version7
D. version8
E. version9
NetworkAhasaspanning-treeprobleminwhichthetrafficisselectingalongerpath.Howisthepathcostcalculated?()
A. numberofhops
B. priorityofthebridge
C. interfacebandwidth
D. interfacedelay
E. Noneoftheabove
AllofthesearefundamentalbuildingblocksofadifferentiatedservicesTrafficConditionerBlockexceptwhichone?()
A. dropper
B. classifier
C. marker
D. querier
E. meter
F. shaper
轨道式塔式起重机,较长轨道每隔20m加一组接地装置。()