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In wired connections, the medium is either copper, which carries electrical signals, or optical fiber, which carries(  )signals.

A. light

B. solar

C. pulse

D. logic

参考答案: A

详细解析:

       在有线连接中,传输介质要么是铜,用来传送电信号;要么是光纤,用来传送光信号。

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