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本文讨论两个问题:1、油液的污染及其控制;2、液压系统的使用与维护。实际上前一个问题是液压系统中油液的使用问题。
This article discusses two issues: 1, oil pollution and its control; 2, the use of hydraulic systems and maintenance. In fact, the former problem is the use of oil in the hydraulic system.