The parameters were processed with SPSS for Windows12.0, and analyzed with repeated-measures ANOVA(α=.05).Results and Discussion:When the backpack load percentage during stair-down walking reaches 10%, knee landing angle, hip angle displacement, and vertical displacement of the center of gravity all have significant difference（pConclusion: Backpack load percentage has influence on human biomechanical performance during stair-down walking.

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Robertson, the former CEO of Rolls-Royce, told journos that the two vehicles would use diffent hybrid systems. The luxury sedan 7-series would make use of a mild hybrid, allowing the engine to be shut down when coasting or braking. Accessories would still run with the engine shut down, making use of an electric motor.

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