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第1题

The electrical transmission medium can consist of (). A.a pair of wires B.a coaxial cable C.a radio link through free
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第2题

()are not utilized for the detection of the signal and the optical-electrical conversion. A.Light emitting diodes B.Ph
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第3题

负载换流式逆变电路分为（），（）。
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第4题

PC-to-PC networking could be easily accomplished between buildings (). A.on one campus B.between campuses C.a or b D
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