单选题Limit switches（）.Acontrol the descent rate of a lifeboatBcontrol the ascent rate of a lifeboatCcut off power to the winch when the lifeboat nears the final stowed positionDcut off power to the winch when the lifeboat reaches the davit bumpers
单选题
Limit switches（）.
A
control the descent rate of a lifeboat
B
control the ascent rate of a lifeboat
C
cut off power to the winch when the lifeboat nears the final stowed position
D
cut off power to the winch when the lifeboat reaches the davit bumpers
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