問題詳情
40.Every vessel shall maintain a proper look-out by sight and hearing as well as by allavailable means appropriate in the prevailing circumstances and conditions so as to make a full appraisal of situation and of the risk of collision.
(A)at all times
(B)often
(C)sometimes
(D)usually
參考答案
答案：A
難度：簡單0.807692
統計：A(21),B(1),C(1),D(3),E(0)