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When lowering manropes alongside a stage rigged over the side of a vessel，they should be allowed to trail in the water（）.
A:to easily remove the kinks that form in the lines
B:to allow the seamen on the stage to know the direction and strength of the current
C:to provide the seaman something to hold onto if he or she falls from the stage into the water
D:only for short periods of time since they will become waterlogged and be very heavy to pull up

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出自：海船船员证

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