The component having the lowest frequency in a complex vibration (fundamental frequency or first harmonic).
复杂振动中频率最低的成分(基频或一次谐波)。
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。
应用推荐