单项选择题
he heel block is located（）.
A.at the base of the boom B.at the cargo hook C.near the midships guy D.near the spider band
单项选择题 The disadvantage of using three strand nylon line for towing is its（）.
单项选择题 The correct way to make an eye in a wire rope with clips is to place the clips with the（）.
单项选择题 The catenary in a towline is（）.
