请帮忙给出正确答案和分析,谢谢!
第1题
A.the lifting appliance can always lift the freight within its rated load
B.attention should be paid in order not to break the wedge when lifting cargo
C.sometimes the lifting work needs other assistance other than the lifting appliance
D.lifting work should be done with every part fit, tightness or adhesion
第2题
The preventer guy,as used on a conventional yard and stay rig,______.
A.Is rigged at an angle of 70° to 90° from the guy it assists
B.Takes the strain imposed on the schooner guy when burtoning cargo
C.Is rigged when lifting cargo that exceeds the SWL of a single whip
D.Should take the strain if the regular guy parts
第3题
A.Keep a load on the hoist until all personnel are finished working
B.Set the load on a movable dolly when transportation may be needed
C.Have one man keep a hand on the load to steady it
D.Insure that the lifting gear capacity is not exceeded
第4题
Elastic strain()
A.is strain thatpermanently remains,when the lvadcausing it is removed
B.occurs below the proportional limit
C.is also known as permammt deformation
D.none of the above
第5题
A. lifting capacity of the winch
B. location of the boom
C. position of the guy
D. weight of the load
第6题
For any given pedestal crane,when the boom is lengthened,the lifting capacity is ______.
A.unchanged
B.increased
C.eliminated
D.decreased
第7题
第8题
Strain()
A.occurs when a force is applied to a material
B.has units of Newtons/Newtons
C.occurs only at room temperature
D.all of the above
第9题
A、shear strain; linearly; radial
B、normal strain; linearly; radial
C、shear strain; nonlinearly; radial
D、shear strain; nonlinearly; longitudinal
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