单项选择题
What should you do to a line to prevent fraying where it passes over the side of the vessel（）.
A.Worm that part of the line B.Splice that part of the line C.Cover it with chafing gear D.Install a cleat
单项选择题 What material may be substituted for zinc when making a poured metal socket ending to a wire rope（）.
单项选择题 What is the main purpose of dunnage（）.
单项选择题 What is the bow type anchor shackle primarily used for（）.
