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單項(xiàng)選擇題

An（）indicates that there is imminent risk for navigation.

A.distress alert
B.urgency message
C.safety message
D.routine message

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單項(xiàng)選擇題

A(n)（）indicates that there is serious danger for vessel, crew and passenger.

A.distress alert
B.urgency message
C.safety message
D.routine message

單項(xiàng)選擇題

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