它是关于80c51单片机的原理介绍和使用其开发的过程，有具体的实例。
It was introduced on the 80c51 microcontroller and use the principle of its development process, with specific examples.
分析了检测原理，介绍了检测传感器的设计。
简述了机车做功记录仪的功能与原理，介绍了一种新的检修计划的制定办法，并使之科学化。
The function and principle of locomotive work recorders were presented. A method to draw up scientific maintenance plans is presented.
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