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?（）
A.One shot of chain for every ten feet of water B.One shot of chain for every fifteen feet of water C.One shot of chain for every thirty feet of water D.One shot of chain for every ninety feet of water
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?（）
单项选择题 What is a step in attaching a poured metal socket to a wire rope?（）
