單項(xiàng)選擇題

A.is used in running rigging
B.doubles the size of the line
C.is only used on fiber rope
D.is very weak

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A.longshore hook
B.margin hook
C.marginal hook
D.pelican hook

A.be a stopper
B.shorten a line
C.join lines of equal size
D.keep a line from passing through a sheave