At present, we use wire communication underground coal mine in our country. Information is transmitted by electric cable. When the accident happened, the communication is discontinued at once.
目前我国煤矿井下通讯基本上是有线装置，依靠电缆传输信息，一旦发生事故，通信马上中断。
At present, we use wire communication underground coal mine in our country. Information is transmitted by electric cable. When the accident happened, the communication is discontinued at once.
目前我国煤矿井下通讯基本上是有线装置，依靠电缆传输信息，一旦发生事故，通信马上中断。
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