单项选择题
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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相关考题
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单项选择题
On no account（）to be exceeded.
A.is the SWL of the crane
B.are the SWL of the crane
C.the SWL of the crane is
D.the SWL of the crane are -
单项选择题
Official draft measurements should be（）by authorized persons，agreed by both parties involved.
A.executed
B.located
C.fixed
D.measured -
单项选择题
Most pedestal crane power is provided by（）.
A.Electro-hydraulic units
B.Steam units
C.Independent internal combustion power units
D.All of the above
