单项选择题
Galvanizing would be suitable for protecting wire rope which is used for（）.
A.cargo runners B.stays C.topping lifts D.All of the above
单项选择题 Extended cyclical variations in tensions will cause an anchor chain to break due to（）.
单项选择题 Cribbing is（）.
单项选择题 Compared to manila line，size for size，nylon line（）.
