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單項(xiàng)選擇題

A whipping is（）.

A.a messenger
B.a stopper for nylon line
C.a U-bolt for securing a cargo whip to the winch drum
D.turns of twine around a rope end

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單項(xiàng)選擇題

A tackle by which the outer end of a boom is raised and lowered is the topping（）.

A.boom
B.lift
C.raise
D.tackle

單項(xiàng)選擇題

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
D.locking ring

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