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
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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 -
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 -
单项选择题
A vessel，which is unable to maneuver due to some exceptional circumstance，shall exhibit （）.
A.during the day，three balls in a vertical line
B.during the day，three shapes，the highest and lowest being balls and the middle being a diamond
C.when making way at night，two all-round red lights，sidelights，and a sternlight
D.when making way at night，masthead lights，sidelights，and a sternlight
