For the physical strength of the national provisions of the determination of how?

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on labor intensity, the state labor protection departments have specific requirements and measured basis. Under which physical strength is measured by measuring certain types of average working hours of labor rate and energy metabolism rate, and calculate their labor intensity index, and then in turn based on indices in accordance with intensity of physical labor is divided into four levels from low to high. The fourth level of physical strength are the most intensive labor.

According to calculations, the eight-hour day on average energy consumption value 11,304.4 kJ / person rate is 77% labor time, labor intensity is clearly significant.