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法国Silec DSI研制了一种新型的井下用的无线电话机,通过地下的铁器管道或网状物体作为波道以加强讯号传输。这套机器的由携带式的轻型收发讯机、反复充电电池组成。整
France Silec DSI has developed a new type of downhole radiotelephone to enhance signal transmission by using underground iron pipes or mesh objects as channels. This machine consists of a portable light transceiver, rechargeable batteries. whole