This paper analyses the common causes for the breakdown in digital circuit experiments and gives measures to the elimination according to experimental teaching practice.
结合数字电路实验教学实践，分析实验常见故障成因并提出排除实验故障的方法。
The influences on electric equipments by harmonic wave were introduced. Combing with the practice harmonic wave elimination and dirty flash preventive measures were briefly introduced.
介绍了谐波对电网中电气设备的影响，结合实际情况简述抑制谐波和预防污闪事故的对策。
It is proved in practice that the development of this testing device is successful. It solves a key technical problem in fault elimination of railway wrecking car.
经工程实践表明本实验装置的研制是成功的，解决了铁路救援机车故障排除中的一个关键技术问题。
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