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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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更多 “ If your passenger vessel is fitted with a loudspeaker system，it must be tested at least once ______.A.every weekB.a dayC.every tripD.a watch or once a trip，whichever is shorter ” 相关考题
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单选题If your passenger vessel is fitted with a loudspeaker system，it must be tested at least once （）.A
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a watch or once a trip，whichever is shorter
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