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单选题
The limit switches on a ships survival-craft winch system（）.
A
stop the winch just before the craft reaches the final stowage position
B
limit the amount of cable on the drum
C
limit the ascent rate
D
stop the winch in case the craft weighs too much
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cut off power to the winch when the lifeboat reaches the davit bumpers
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an EGC receiver onlyB
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单选题Limit switches are used on which davits?（）A
Sheath-screw davitsB
Gravity davitsC
Radial davitsD
Quadrantal davits
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