单项选择题
The difference between the height of the metacenter and the height of the center of gravity is known as the（）.
A.metacentric height B.height of the righting arm C.fore and aft perpendicular D.height of the center of buoyancy
单项选择题 The difference between the forward and aft drafts is（）.
单项选择题 The center of flotation of a vessel is the point in the waterplane（）.
单项选择题 The angular motion of a ship in the athwartship is termed（）.
