使用直流电是产生静电磁场的另一个原因，例如铁路系统使用直流电，电视和计算机屏幕带有阴极放射管。
The use of DC electricity is another source of static electric fields, e.g. rail systems using DC, and televisions and computer screens with cathode ray tubes.
本文叙述了静电产生的原因及静电对电子线路板的危害，还介绍了电子线路板的防静电包装方案及检测技术。
Ths paper relates the reasons that cause static electricity as well as the electron circuit plate. It also introduces anti-electrostatic packing of electron circuit plate and tests technology.
通过对粉末静电涂装产生涂膜弊病原因的分析，找出预防的对策，以提高涂装涂膜质量。
Through analyzing the causes of surface film defects produced in electrostatic powder coating, countermeasures were given to improve the quality of surface film.
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