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.
在CNBC电视台，巴菲特表示一加仑柴油在铁路上能把一吨货物运送470英里远。
Speaking on CNBC television, Buffett said that one gallon of diesel fuel can haul a ton of goods for 470 miles on the railways.
二极管主要用于军工、航天、船舶、通信、铁路、计算机、电视机、显示器、空调等家用电器及仪器仪表各个领域；
The diodes are mainly used for military, spaceflight, shipping, communication, railway, computer, TV set, display, air-condition and etc.
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