单项选择题
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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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 -
单项选择题
Our ship has not been to shipyard for a long time, the fouling on the ship’s hull greatly decreases her().
A.resistance
B.weight
C.speed
D.displacement
