問題詳情
8. ______ is a sound signal comprising of seven short and one prolonged blasts and is oftengiven when ships are in distress.
(A) Alarm
(B) Fire alarm
(C) General collision 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)