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用四球机考察了含粘度指数改进剂的油品在苛刻条件下的润滑特性,证明其影响与正常润滑条件下的结论有差异。
The four-ball machine was used to investigate the lubricating properties of oil products with viscosity index improvers under harsh conditions, and the results showed that the effects were different from those under normal lubrication conditions.