单项选择题
A.doubling
B.pretensioning
C.piggybacking
D.paralleling
单项选择题 In a crossing situation,a vessel fishing must keep out of the way of a vessel which is().
单项选择题 In a combination chain and wire rope mooring system,the anchor chain is deployed at the anchor end of the line to().
单项选择题 Galvanizing would not be suitable for protecting wire rope which is used for().