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
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1.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
2.單項(xiàng)選擇題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
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