单项选择题
A.A lightly laden vessel requires as much stopping distance as a fully laden vessel when the current is from astern
B.A vessel is dead in the water when the back wash from astern operation reaches the bow
C.A tunnel bow thruster can be used in an emergency to reduce the stopping distance
D.When a vessel is dead in the water any speed displayed by doppler log reflects the current
单项选择题 Which is TRUE of a stiff vessel? （）
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? （）