单项选择题
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
单项选择题 Catenary as applied to tow lines denotes the（）.
单项选择题 Besides saving distance along the track line，another advantage of the Scharnow Turn over the Williamson Turn in a man overboard situation because（）.
单项选择题 At night，a vessel shall indicate that she is restricted in her ability to maneuver by showing in a vertical line two（）.