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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单项选择题

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

A.executed
B.located
C.fixed
D.measured

单项选择题

A.Electro-hydraulic units
B.Steam units
C.Independent internal combustion power units
D.All of the above