單項(xiàng)選擇題A whipping on a fiber line（）.
A.keeps the ends from fraying
B.strengthens it
C.protects your hands
D.becomes part of a splice
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1.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
2.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
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