单项选择题
A.It has a small GM
B.It pitches heavily
C.It has an unusually high center of gravity
D.Its period of roll is short
单项选择题 Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）
单项选择题 Which change in the condition of the seas could indicate the formation of a tropical storm or hurricane several hundred miles from your location? （）
单项选择题 When the period of beam seas equals the natural rolling period of a vessel，what will most likely occur?（）