单选题If your passenger vessel is fitted with a loudspeaker system，it must be tested at least once （）.Aevery weekBa dayCevery tripDa watch or once a trip，whichever is shorter
单选题
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
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