单项选择题
A.Keep the wire soft and manageable
B.Lubricate the inner wires and prevent wear
C.Prevent kinking
D.Prevent rotting
单项选择题 What is the best guide for determining the proper scope of anchor chain to use for anchoring in normal conditions?（）
单项选择题 What is NOT suitable for use in making up the towing rig for a heavy，long ocean tow?（）
单项选择题 What is an advantage of having wire rope with a fiber core over that of a wire rope of the same size with a wire core?（）