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The pushbutton on the handset of a ships sound-pow...

海船船员考试

单选题

The pushbutton on the handset of a ships sound-powered telephone must be depressed to （）.

发布日期：2021-03-22

A.talk then released to listen

B.listen then released to talk

C.both talk and listen

D.ring the station being called

标签： pushbutton handset ships sound-powered telephone

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