单项选择题
The condition where a ship on the end of a tow line is riding a wave crest at the same time as its tug rides a wave crest is known as riding in（）.
A.synchronism B.harmony C.check D.step
单项选择题 The catenary（）.
单项选择题 The biggest problem you generally encounter while towing a single tow astern is（）.
单项选择题 The best method to secure a tow line to a cleat is to（）.
