单项选择题

When attempting to free an anchor jammed in the hawsepipe，the simplest method of freeing it may be（）.

A.Starting the disengaged windlass at high speed
B.Rigging a bull rope to pull it out
C.To grease the hawsepipe
D.To pry it loose with a short piece of pipe

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When a davit-launched raft is lowered from a ship，upon becoming waterborne，the raft is released by（）.

A.activating the release lock of the hook
B.pulling smartly on the knobbed cocking lanyard
C.the effects of buoyancy removing the weight of the raft from the hook
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What equipment is customarily used when seamen are working on a stage rigged over the side of a vessel（）.

A.Jacob's ladder
B.Manropes
C.Heaving lines
D.All of the above