中文说明：从Excel表中读取数据，然后分析其频谱、相谱和总谐波畸变率，并画出图（plot）。
English Description：
Read data from excel table, then analyze its spectrum, phase spectrum and total harmonic distortion rate, and draw a plot.
After reading data in Excel, the spectrum, phase spectrum and total harmonic distortion rate are ana
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中文说明：从Excel表中读取数据，然后分析其频谱、相谱和总谐波畸变率，并画出图（plot）。
English Description：
Read data from excel table, then analyze its spectrum, phase spectrum and total harmonic distortion rate, and draw a plot.