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.
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。
Every processor in the computer has these tubes directly attached to them, so no processor in the system overheats.
直接附着于计算机的每个处理器，使之不会过热。
The first general-purpose computer, the nearly 30-ton ENIAC (1947), contains 18,000 vacuum tubes, 70,000 resistors and 10,000 capacitors.
世界上第一台电脑——近30吨埃涅阿克（1947年），使用了18000个电子管，另加1500个继电器以及其它器件，其总体积约90立方米，重达30吨，占地170平方米，需要用一间30多米长的大房间才能存放，是个地地道道的庞然大物。
Eddy current detection of the surface cracks in the headings of brake tubes, including the making of testing probe, computer control and the design of mechanical driving mechanism is described.
介绍油管镦头表面裂纹涡流检测方法，包括探头的制作以及计算机控制过程和机械传动机构设计。
The computer program which insures fast and accurate computation is applicable to production of cold-rolled steel tubes and non-ferrous metalic tubular products.
该电算程序具有运算速度快、结果准确等优点，适合于冷轧钢管和有色金属管材生产。
The computer program which insures fast and accurate computation is applicable to production of cold-rolled steel tubes and non-ferrous metalic tubular products.
该电算程序具有运算速度快、结果准确等优点，适合于冷轧钢管和有色金属管材生产。
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