单项选择题
That is the （）(污水井).
A. bilge well B. ballast water C. fresh water D. sea water
单项选择题 It is a （）(压载水) tank.
单项选择题 From the waterline to the ship’s（）(底部) is called draft.
单项选择题 From the （）(水线) to the ship’s bottom is called draft.
