深圳C网用户呼叫联通异地固话和异地手机的选路方式为()。
A. 发端接入/受端入网
B. 受端入网/发端接入
C. 发端接入/发端接入
D. 受端入网/受端入网
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开关箱中漏电保护器的额定漏电动作时间不应大于0.1秒。
A. 正确
B. 错误
Which of the following characteristics describe the Root Guard feature?(Choose all that apply.)()
A. The port must be put into forwarding state manually after root-inconsistent state has beencorrected
B. A Root Guard port receiving superior BPDU goes into a root-inconsistent state
C. A Root Guard port receiving inferior BPDU goes into a root-inconsistent state
D. While the port is in a root-inconsistent state no user data is sent across that port
E. The port returns to a forwarding state if inferior BPDUs stop
F. It should be applied to all switch port
()DB11/418《电梯日常维护保养规则》标准规定,电梯施工单位负责人对使用单位的电梯安全全面负责。
A. 正确
B. 错误
()的定义,是设备能分辨单根实芯镀锡铜线的能力,一般用线的标称直径(mm)和线号(AWG)表示
A. 穿透力
B. 线分辨力
C. 通过率
D. 灰度分辨力