单项选择题
A.made only of wire rope，due to possible weather conditions
B.that will have the tow on a crest while your vessel is in a trough
C.that will have the tow on a crest while your vessel is on a crest
D.with little dip to gain maximum control of the tow
单项选择题 When towing astern，increased catenary will（）.
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（）.