問題詳情

21.Visibility is expected to decrease to 5 nautical miles, so the Automatic Fog Signal is switchedby Third Mate.
(A)off
(B)on
(C)at
(D)with

參考答案

答案：B
難度：簡單0.818182
統計：A(2),B(27),C(0),D(3),E(0)