通信工题库汇编 20

铁路( )是直接为运输生产第一线服务的。

发布于 2021-03-23 11:47:55

【单选题】
A 专用通信
B 长途通信
C 地区通信
D 无线通信

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Lomu 2023-03-23

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这家伙很懒，什么也没写！

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