The principle of magnetic-fluid reciprocating shaft seal is introduced, some problems of its design and application are analyzed from the point of view of tribological design.
介绍了磁流体往复轴密封的原理，从摩擦学设计角度分析了其设计和使用中要注意的问题。
The working principle of the developed micro-tribological test apparatus was described and the detailed experiments were done with the apparatus for the surface friction of Cu and al.
详细介绍了测试仪的工作原理，并利用该仪器对铝和铜的表面进行了测试。
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