問題詳情

21.General emergency alarm means a sound signal of seven short blasts and one blastgiven with the vessel’s sound system.
(A)big
(B)short
(C)enforce
(D)prolonged

參考答案

答案：D
難度：簡單0.704545
統計：A(1),B(18),C(4),D(62),E(0)