A(n)（）indicates that is serious and inmmediate danger for vessel, crew and passengers.<br>A:distress alert<br>B:urgency message<br>C:safety message<br>D:routine message

A(n)（）indicates that is serious and inmmediate danger for vessel, crew and passengers.
A:distress alert
B:urgency message
C:safety message
D:routine message

出自：海船船员证

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