单项选择题
A.Greenwich Mean Time B.Gross Mean Time C.Great Mean Time D.Gross Metric Ton
It is danger for vessels without the use of（）to approac...
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
When visibility is 20 nautical miles, we say that visib...
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
Our ship has not been to shipyard for a long time, the ...
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
