单项选择题

At night，a vessel shall indicate that she is restricted in her ability to maneuver by showing in a vertical line two（）.

A.red lights
B.red lights and two white lights
C.red lights with a white light in between
D.white lights with a red light in between

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单项选择题
As a vessel falls off the wind from close-hauled to a beam reach，the tendency for the vessel to move sideways through the water will（）.

A.increase
B.decrease
C.change only if the vessel comes about on the opposite tack
D.not change
单项选择题
As a ship moves through the water，it drags with it a body of water called the wake. The ratio of the wake speed to the ship’s speed is called（）.

A.propeller velocity
B.speed of advance
C.wake distribution
D.wake fraction
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