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单选题
When you use the hand micphone, the REU will decrease the volume to the flight compartment speaker.
A
The hand micphone will decrease the volume to the flight compartment speaker by the REU.
B
The volume of REU in the cockpit will be reduced when you use a handmicphone .
C
The volume of speaker in the cockpit will be reduced by REU when you use a hand micphone.
答案解析
正确答案：C
