单项选择题
A wind has caused a difference between drafts starboard and port. This difference is（）.
A.list B.heel C.trim D.flotation
单项选择题 Deballasting a double bottom has what affect on KG?（）.
单项选择题 For a floating vessel，the center of buoyancy and the metacenter are in the line of action of the buoyant force（）.
单项选择题 For a floating vessel，the result of subtracting KG from KM is the（）.
