The pushbutton on the handset of a ships sound-powered telephone must be depressed to （）.<br>A:talk then released to listen<br>B:listen then released to talk<br>C:both talk and listen<br>D:ring the station being called

The pushbutton on the handset of a ships sound-powered telephone must be depressed to （）.
A:talk then released to listen
B:listen then released to talk
C:both talk and listen
D:ring the station being called

出自：海船船员证

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