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Harmonics are periodic distortions of voltage, present, or ability sine waves. Harmonics in ability distribution devices are frequently attributable to non-linear hundreds for example switched mode dc energy materials and adjustable pace motor drives.XSMB - XSTD - KQXSMB - Xổ số MB - Kết quả xổ số Miền Bắc hôm nay. Cập nhật k�