The object-oriented technology based procedure design for DF series locomotive water rheostat load test was described. Some problems arisen in software design were discussed.

介绍了基于面向对象技术的东风系列机车水阻试验系统软件设计以及软件设计中的若干技术问题。

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Series of EQDN engine is a natural gas engine which is developed by DF Company owns its intellectual property rights and many patent technologies.

EQDN系列发动机是东风公司研发的具有自主知识产权的天然气发动机，拥有多项专利技术。

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