单项选择题
Chafing gear is used to（）.
A.anchor the boat B.pick up heavy loads C.protect fiber rope from abrasion D.strengthen mooring lines
单项选择题 Chafing gear is normally used（）.
单项选择题 Back-up wires on a towed vessel provide（）.
单项选择题 At the instant when a string of casing being run from a ship is landed in the well head,（）.
