The design principle of the optical system and electronic system are described detailed as well as the cooperation between them.
详细论述了其电子和光学系统的设计原理，以及两部分的协调。
Introduces the principle of frame leak protection in DC traction power supply system, and compares it with OVPD to explain the cooperation of them.
介绍了直流牵引供电系统中常见的框架泄漏保护装置的原理，并与轨电位装置进行比较，说明两者的配合。
It's main content concerns:(1) the industrial management system should be reformed according to speciality cooperation principle;
主要内容有：（ 1 ）按专业化协作化原则改组工业管理体系；
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