The first chapter was built on harmonic fundamental concepts, harmonic harm and influence, and then described the present condition.
第一章主要介绍谐波的基本概念，谐波的危害及谐波问题的研究现状。
The first chapter was built on harmonic fundamental concepts, harmonic harm and influence, and then described the present condition.
第一章主要介绍谐波的基本概念，谐波的危害及谐波问题的研究现状。
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