单项选择题
A.is used in running rigging B.doubles the size of the line C.is only used on fiber rope D.is very weak
A hook that will release quickly is a（）.A.longshore hoo...
单项选择题A hook that will release quickly is a（）.
A.longshore hook B.margin hook C.marginal hook D.pelican hook
A figure eight knot is used to（）.A.be a stopperB.shorte...
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
A fiber rope can be ruined by dampness because it may（）...
单项选择题A fiber rope can be ruined by dampness because it may（）.
A.rot B.shrink C.stretch D.unlay
