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單項選擇題

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

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單項選擇題

Cirrocumulus belongs to（）.

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

單項選擇題

Altostratus belongs to（）.

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

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