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单选题
Pedestal cranes have limit switches to restrict movement of which function（s）（）.
A
Hoist upper & lower limits
B
Luff travel limits
C
Rider block hoist upper & lower limits
D
All of the above
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split pinsB
crankpinsC
dipsticksD
circlips
考题
单选题Limit switches are used on which davits?（）A
Sheath-screw davitsB
Gravity davitsC
Radial davitsD
Quadrantal davits
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