问题
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
答案
参考答案：D
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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
参考答案：D