問題詳情

23. A sound signal of seven short blasts and one long blast given with the vessel’s sound systemis_____ .
(A) distress alarm
(B) abandon alarm
(C) fire drill alarm  
(D) general emergency alarm

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)