单项选择题
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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In a weather report “GMT” stands for（）.
A.Greenwich Mean Time
B.Gross Mean Time
C.Great Mean Time
D.Gross Metric Ton -
单项选择题
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 -
单项选择题
When visibility is 20 nautical miles, we say that visibility is（）.
A.very good
B.good
C.poor
D.moderate
