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

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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（）.

A.rot
B.shrink
C.stretch
D.unlay

单项选择题

A chock is a（）.

A.deck fitting used to secure mooring lines
B.casting fitted at the side of a weather deck，used as a fairlead
C.sharp block of wood used to support hygroscopic cargo
D.smoke pipe for the galley stove