單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

When visibility is 20 nautical miles, we say that visibility is（）.

A.very good
B.good
C.poor
D.moderate