5/29 hydraulic support,knocking at vat of push jack could be passed away,lift end of piston bar could not be knocked deformed,assemblage of pressing tray could not be affected,labour intensity of workers could be mitigated,productivity could be raised.

The article sites test prop-setters' labour physiolgicai parameters on mechanized coal face and simulates the impact on operators by climatic load and labour intensity.

After long and hard studing of the question,the author comes tothe conclution that the surplus value production caused by increasing of labour intensity be-longs to the absolute surplus value production.

Through its application in the flowsheet of cyanidation CIL,the disadvantages of arc and trommel screens were overcome,the labor intensity was lessened,the production cost dropped down and the process flow was stabilized,thus creating favorable conditions for improving technical index.

In order to improve the logistics,raise the efficiency,reduce the labor intensity,the authors improve the machining process of the bus iron side compartment doors.

The labor intensity and the fatigue are one of the important contents of ergonomics.

8σf,σf the dynamic fatigue strength, thediscrepancy between the dynamic fatigue strength measured by the preloading thechnique and thetrue dynandc fatigue strength of specimens can be neglected.