NetworkAhasaspanning-treeprobleminwhichthetrafficisselectingalongerpath.Howisthepathcostcalculated?()
A. numberofhops
B. priorityofthebridge
C. interfacebandwidth
D. interfacedelay
E. Noneoftheabove
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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。()
外挂架搭设完毕应形成一个封闭整体,转角处、错台位置应用钢管安全网封闭严密。()
对配电箱、开关箱进行定期维修、检查时,必须将其前一级相应的电源隔离开关和断路器分闸断电,如遇特殊情况可以带电作业。()