阿摩線上測驗
4. If 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
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統計： A(166), B(106), C(24), D(8), E(0) #3407473
統計： A(166), B(106), C(24), D(8), E(0) #3407473
