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38.If there has no crew was changed within last four months, the ISPS drills should be conducted .
(A)at least once
(B)at least once within last six month
(C)at least once in a year
(D)twice within eighteen months

船舶通訊與航海英文(概要)- 100 年 - 100一等船副船舶通訊與航海英文#15875

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