問題詳情

34 Mooring and unmooring services are _______ both to ensuring vessel safety and handling ship cargoes efficientlyand effectively.
(A)optional
(B)justified
(C)dynamic
(D)crucial

參考答案

答案：D
難度：適中0.435294
統計：A(18),B(9),C(13),D(37),E(0)