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Harmonics are periodic distortions of voltage, current, or power sine waves. Harmonics in power distribution units are sometimes due to non-linear masses which include switched method dc electric power materials and adjustable velocity motor drives.xsmbsxmbxổ số miền bắcKết quả xổ số thứ 4Kết quả xổ sốXsmb thứ 4xsmb hôm