An operator wearing earphone was sitting in the telephone exchange.
机的接线员正坐在总机室里。
机;听筒
收话器;机;机;朵;
;An operator wearing earphone was sitting in the telephone exchange.
机的接线员正坐在总机室里。
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：
接收信号---一个放大器，一个晶体管---一个可变电阻的电容器---一个扬声器或极的输出装置。
声明：以上例句、词性分类均由互联网资源自动生成，部分未经过人工审核，其表达内容亦不代表本软件的观点；若
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