单项选择题
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
As a vessel falls off the wind from close-hauled to a b...
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
As a ship moves through the water，it drags with it a bo...
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
Apparent wind speed blowing across a vessel under tow c...
单项选择题Apparent wind speed blowing across a vessel under tow can be measured by a(n)（）.
A.barometer B.wind vane C.anemometer D.thermometer
