An operator wearing earphone was sitting in the telephone exchange.
戴的接线员正坐在总室里。
An operator wearing earphone was sitting in the telephone exchange.
戴的接线员正坐在总室里。
The Capacitor turns the signal in antiphrasis, the only thing whole. The Earphones do such long ago. The Shot of the handgun not audible.
什么是积极保护?基本原理是:发射和接收信号---个放大,个晶体管---个可变电阻的电---个扬声或射极的输出装置。
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