单项选择题
Towlines should be inspected for chafing where the towline（）.
A.passes over the stern of the towing vessel B.passes through chocks C.is attached to the disabled vessel D.All of the above
单项选择题 The strongest of the natural fibers is（）.
单项选择题 The spray of water in low-velocity fog will have（）.
单项选择题 The splice designed to pass easily through a block is called a(n)（）.
