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單項選擇題

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

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單項選擇題

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

單項選擇題

Apparent wind speed blowing across a vessel under tow can be measured by a(n)（）.

A.barometer
B.wind vane
C.anemometer
D.thermometer