单项选择题
Compared to manila line，size for size，nylon line（）.
A.has less strength than manila line B.has more strength than manila line C.is equivalent to manila line D.will rot quicker than manila line
单项选择题 Chafing gear is used to（）.
单项选择题 Chafing gear is normally used（）.
单项选择题 Back-up wires on a towed vessel provide（）.
