If your passenger vessel is fitted with a loudspeaker system，it must be tested at least once （）.<br>A:every week<br>B:a day<br>C:every trip<br>D:a watch or once a trip，whichever is shorter

If your passenger vessel is fitted with a loudspeaker system，it must be tested at least once （）.
A:every week
B:a day
C:every trip
D:a watch or once a trip，whichever is shorter

出自：海船船员证

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