单选题If there’s a fire aboard your vessel, you should first（）.Anotify the competent authoritiesBsound the alarmChave passengers put on life preserversDcut off air supply to the fire
单选题
If there’s a fire aboard your vessel, you should first（）.
A
notify the competent authorities
B
sound the alarm
C
have passengers put on life preservers
D
cut off air supply to the fire
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