A.propeller velocity
B.speed of advance
C.wake distribution
D.wake fraction
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A.barometer
B.wind vane
C.anemometer
D.thermometer
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
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
A.smelling the bottom
B.squatting
C.bank suction
D.bank cushion
A.the masthead lights for a towing vessel
B.the lights for a vessel restricted in its ability to maneuver
C.sidelights，sternlight and towing light
D.All of the above
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A vessel travelling down a narrow channel，especially if the draft is nearly equal to the depth of the water，may set off the nearer side. This effect is known as（）.
One major advantage of the round turn maneuver in a man overboard situation is that it（）.
The distance that a vessel travels from the time that the order to put engines full astern until the vessel is dead in the water is known as（）.
The best method to secure a tow line to a cleat is to（）.
One advantage of chain over wire rope for a tow bridle is that chain（）.
In towing，heaving lines are used for（）.
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（）.
Most of your vessel’s superstructure is forward. How will the vessel lie when drifting with no way on?（）.
In order to back a right-handed，single-screw vessel in a straight line，you will probably need to use（）.
If a vessel under tow starts jumping on its tow line，the most appropriate action to alleviate the condition is to（）.