单项选择题
The existence of liquids in partially full tanks or compartments of a ship causes a virtual rise in the height of the（）.
A.metacenter B.center of buoyancy C.center of flotation D.center of gravity
单项选择题 The downflooding angle for a ship is the minimum angle at which（）.
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（）.
单项选择题 The difference between the forward and aft drafts is（）.
