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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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 -
单项选择题
A vessel which through some exceptional circumstance is unable to maneuver as required by these Rules and is therefore unable to keep out of the way of another vessel is called（）.
A.a vessel restricted in her ability to maneuver
B.a vessel not under command
C.a vessel engaged in fishing
D.a vessel constrained by her draught
