单项选择题
A.Hoist upper & lower limits B.Luff travel limits C.Rider block hoist upper & lower limits D.All of the above
On no account（）to be exceeded.A.is the SWL of the crane...
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
Official draft measurements should be（）by authorized pe...
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
Most pedestal crane power is provided by（）.A.Electro-hy...
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
