问题
单项选择题
A sound signal of seven short blasts and one long blast given with the vessel’s sound system is().
A.Safety alarm
B.Distress alarm
C.Fire drill alarm
D.General emergency alarm
答案
参考答案:D
A sound signal of seven short blasts and one long blast given with the vessel’s sound system is().
A.Safety alarm
B.Distress alarm
C.Fire drill alarm
D.General emergency alarm
参考答案:D