A(n)()indicates that is serious and inmmed
问题:
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
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