单项选择题
A chain bridle is used when towing astern because it（）.
A.Is easy to connect B.Provides an effective catenary and absorbs shock due to its weight C.Makes rigging a swivel unnecessary D.Prevents the tow from yawing by the drag of the chains in a seaway
单项选择题 A cargo boom is a（）.
单项选择题 A 6x19 wire rope would be（）.
单项选择题 A 6x12，two-inch wire rope has（）.
