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Harmonics are periodic distortions of voltage, latest, or power sine waves. Harmonics in ability distribution systems are sometimes brought on by non-linear loads including switched method dc electricity supplies and adjustable speed motor drives.Kết Quả Xổ Số Kết Quả Xổ Số Miền Nam Kết Quả Xổ Số Miền Trung Kết Quả X