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通信系统具备的三个要素是指什么?( )
分类: 通信专业业务
发布时间: 2023-11-19 12:28
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通信系统具备的三个要素是指什么?( )
A.A、终端、电缆、计算机
B.B、信号发生器、通信线路、信号接收设备
C.C、终端、通信设施和通信媒体
D.D、信源、通信媒体、信宿
正确答案是D
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