单项选择题
Chafing gear is used to（）.
A.anchor the boat
B.pick up heavy loads
C.protect fiber rope from abrasion
D.strengthen mooring lines
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A stopper used in securing the ground tackle for sea that consists of a grab attached to a turnbuckle is a（）.
A.riding pawl
B.buckler
C.devil's claw
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单项选择题
A stage should only be rigged（）.
A.over the bow or stern of a vessel
B.over the flat sides of a vessel
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A.block used only with manila rope
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