单选题A sound signal of seven short blasts and one long blast given with the vessel’s sound system is（）.ASafety alarmBDistress alarmCFire drill alarmDGeneral emergency alarm
单选题
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
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