In improvement of machine design and reasonable selection of design parameters not only strength design but tribology design as well are required.
提高机械设计的质量，合理选择设计参数，不仅需要进行强度设计，而且需要进行摩擦学设计。
Through reasonable selection of design parameters, circulating lead can be completely avoided. Typical detailed testing information is also described in the paper.
若合理选择设计参数完全可以避免循环负荷，并列举了详细的测试资料。
The paper describes emphatically the principles of electrical leakage protector, the selection of design parameters and erection as well as wiring and inquires into the reliability of it.
重点论述漏电保护装置的原理、设计参数选定和安装接线，对其可靠性进行探讨。
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