单选题What equipment is customarily used when seamen are working on a stage rigged over the side of a vessel（）.AJacob's ladderBManropesCHeaving linesDAll of the above
单选题
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
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