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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1.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
2.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
