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该文对目前市上几种发动机性能恢复剂作用效果进行了大量的发动机性能试验,证实了此类添加剂的作用效果,并对其作用机理进行了分析.“,”In this paper,through a lot of experiments about the effect of the several additives to recover engine performance.,their effect is proved,and then the mechanism is analysed.