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1 前言当今,全球保护环境的呼声越来越强烈,尤其要求降低汽油机油耗。其具体措施就是减小活塞环的侧面总张力以及采用低摩
1 Introduction Nowadays, the global voice of environmental protection is getting stronger and stronger, especially requiring to reduce gasoline engine fuel consumption. The specific measures are to reduce the total tension of the piston ring side and the use of low-friction