液压系统运动的可靠性、准确性和灵活性，在很大程度上取决于工作液体选择与使用是否合理。
The hydraulic system movement's reliability, the accuracy and the flexibility, are decided to a great extent in the operating fluid choose and use whether reasonably.
闭式系统中，液压泵的进油管直接与执行元件的回油管相连，工作液体在系统的管路中进行封闭循环。
Closed system, the hydraulic pump directly into the pipe return pipe connected to the implementation of components, working fluid in the system for closed loop pipeline.
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