另外，在齿轮CAD系统中还设计了齿廓误差计算、齿轮测绘及齿轮国家标准查询等一些具有较大实用价值的模块。

In addition, the CAD system includes some more utility modules, such as module of gear calculation of error of gear profile, module of gear measurement, module of looking up nation standard of gear.

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通过对已有研究的分析发现研究中有理论研究与实践脱离、指标体系缺乏可操作性、没有国家标准等问题。

The problems existed in the researches mainly include: the disjoint between theory and practice, the index system's poor maneuverability, and lack of national standard.

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结合新的国家标准02d501 - 2，探讨了进行等电位联结的必要性。

The necessity of equal potential connection is discussed, combined with the new national standard (02d501-2).

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