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 “fifteen-pound” CO2 extinguisher is so called because（）.
单项选择题 A “check” line is（）.
单项选择题 A “bowline” is used to（）.
