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单选题
823. 控制通信和导航接收机输出到机组耳机和扬声器,以及机组麦克风输出到通信发射器的系统部分。
A
That portion of the system which controls the output of the communications and navigation transponder into the flight crew headphones and speakers, and the output of the flight crew microphones into the communications transmitters.
B
That portion of the system which controls the output of the communications and navigation receivers into the flight crew headphones and speakers, and the output of the flight crew microphones into the communications transmitters.
C
That portion of the system which controls the output of the communications and navigation transmitter into the flight crew headphones and speakers, and the output of the flight crew microphones into the communications transmitters.
答案解析
正确答案：B
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