单项选择题
A.扩声按钮 B.音量开关 C.增量按钮 D.监听开关
A.后置衰减监听按钮 B.耳机监听按键 C.前置监听按键 D.返送按键
A.Phues B.Pass C.Phones D.Pans
A.Achor B.Pumker C.Loopsor D.Compressor
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