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單項選擇題

To become an officer on board, you must obtain（）.

A.an officer's license
B.an officer's promotion
C.an officer's statement
D.a seaman's book

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單項選擇題

In a weather report “GMT” stands for（）.

A.Greenwich Mean Time
B.Gross Mean Time
C.Great Mean Time
D.Gross Metric Ton

單項選擇題

It is danger for vessels without the use of（）to approach the estuary in such poor visibility.

A.Loran C
B.Direction Finder
C.Gyro- compass
D.Radar