题目内容

填空传输媒体总体上可以分为两大类,其中双绞线、同轴电缆和光纤属于____型传输媒体。

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填空无线电微波通信在数据通信中占有重要地位。微波在空间主要是直线传播。传统的微波通信主要有两种方式,即____和卫星通信。

_________he is still working on the project, I do not mind when he will finish it.

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D. werejust unloaded