单项选择题
A figure eight knot is used to（）.
A.be a stopper B.shorten a line C.join lines of equal size D.keep a line from passing through a sheave
单项选择题 A fiber rope can be ruined by dampness because it may（）.
单项选择题 A chock is a（）.
单项选择题 After splicing an eye in a piece of wire rope，the splice should be parceled and served to（）.
