单项选择题
A.increase control of the tow
B.prevent the towing vessel from going in irons
C.make the towing vessel less maneuverable
D.reduce shock stress on the towing hawser
单项选择题 When steering a tow downstream around the shape of a sand bar，and staying on the proper side of the buoys，an operator should be cautious of（）.
单项选择题 When attempting an upstream landing while pushing empty barges ahead in a hard onshore wind，the approach is best made（）.
单项选择题 When approaching Block Island Sound from Long Island Sound，you will enter waters governed by the International Rules of the Road when you（）.