单项选择题

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

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单项选择题

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

单项选择题

A.low clouds
B.High clouds
C.Special clouds
D.medium clouds

单项选择题

A.Low cl;ouds
B.High clouds
C.Special clouds
D.medium clouds