单项选择题
A.mean draft
B.true mean draft
C.mean of the calculated drafts
D.draft at the center of flotation
单项选择题 The angle to which a floating ship，with a negative initial metacentric height，lies while at rest in still water is the angle of（）.
单项选择题 Some cargoes are（）in weight but（）in size.
单项选择题 Shifting weight aft in heavy weather will reduce the tendency to yaw，but may increase the tendency to（）.