单选题An administrator finds a phone line but does not know where the line goes or if it is active. Whichof the following can be used to test if it is active?（）AButt setBPunch down toolCCable testeDCable stripper
单选题
An administrator finds a phone line but does not know where the line goes or if it is active. Whichof the following can be used to test if it is active?（）
A
Butt set
B
Punch down tool
C
Cable teste
D
Cable stripper
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解析：
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