单选题The pushbutton on the handset of a ships sound-powered telephone must be depressed to （）.Atalk then released to listenBlisten then released to talkCboth talk and listenDring the station being called
单选题
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
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