单项选择题
To calculate the free surface correction，it is necessary to divide the free-surface moments by the（）.
A.total weight of liquid loads B.total displacement C.lightweight D.deadweight
单项选择题 The waterplane area is described as the intersection of the surface of the water in which a vessel floats and the（）.
单项选择题 The volume of watertight spaces of a vessel above its waterline is the vessel’s（）.
单项选择题 The upward pressure of displaced water is called（）.
