单项选择题
Bilge keels are more effective at dampening rolls as the（）.
A.pitching increases B.list increases C.rolling increases D.draft decreases
单项选择题 Before counterflooding to correct a list，you must be sure the list is due to（）.
单项选择题 At an angle of loll，the righting arm (GZ) is（）.
单项选择题 At an angle of loll，the capsizing moment is（）.
