单项选择题
What is NOT suitable for use in making up the towing rig for a heavy，long ocean tow?（）
A.Chain B.Ring C.Solid thimble D.A fishplate
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?（）
单项选择题 What is a step in attaching a poured metal socket to a wire rope?（）
单项选择题 What is a spill pipe?（）
