closed talking microphone
... closed circuit 闭合电路 closed talking microphone 近讲传声器 CLV 恒线（性）速度 ...
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CTM CloseTalkingMicrophone
待续_觉悟沉沦_新浪博客 ... CTL control控制(磁头，信号) CTM Close talking microPHone近讲传声器 CTV Colour television彩色电视 ...
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