单项选择题
What is reserve buoyancy?（）.
A.The amount of buoyancy measured in foot/tons B.The vertical distance above the waterline inside the hull C.The volune of space that is filled with water D.The volume of intact space above the waterline
单项选择题 When air is at its dew point it（）.
单项选择题 When cargo is shifted from the main deck into the lower hold of a vessel,（）.
单项选择题 When liquid is free to move transversely in a tank, the effect is called（）.
