单项选择题
A.Adding the KB and the BM
B.Subtracting the KB from the BM
C.Subtracting the GM from the KB
D.Adding the GM and the KB
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（）.
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（）.