單項選擇題

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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單項選擇題

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

單項選擇題

Official draft measurements should be（）by authorized persons，agreed by both parties involved.

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