单项选择题
For the deepest water when rounding a bend in a river，you should navigate your vessel（）.
A.toward the inside of the bend
B.toward the outside of the bend
C.toward the center of the river just before the bend，then change course for the river's center after the bend
D.in the river's center
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Catenary as applied to tow lines denotes the（）.
A.dip of the line
B.stretch of the line
C.strain on the line
D.length of the line -
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Besides saving distance along the track line，another advantage of the Scharnow Turn over the Williamson Turn in a man overboard situation because（）.
A.it is faster
B.it can be used in both the immediate action and the delayed action situations
C.in fog，if the turn is started as soon as the man goes over，the vessel will be at the point where he went over when the turn is completed
D.it returns the vessel to the original track line on a reciprocal course -
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At night，a vessel shall indicate that she is restricted in her ability to maneuver by showing in a vertical line two（）.
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
