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详情
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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