問題詳情
39.In or near an area of restricted visibility, a vessel not under command shall sound at intervals ofnot more than two minutes .
(A)one prolonged blast
(B)two prolonged blast
(C)one prolonged blast followed by two short blasts
(D)one prolonged blast followed by three short blasts
參考答案
答案：C
難度：適中0.5
統計：A(1),B(0),C(1),D(0),E(0)