H?i ??ng XSKT khu v?c mi?n Nam yêu c?u ??i lý ph?i cho ng??i bán l? tr? l?i vé s? ?Harmonics are periodic distortions of voltage, present-day, or energy sine waves. Harmonics in electricity distribution methods will often be brought on by non-linear loads including switched mode dc energy materials and adjustable pace motor drives.H?i ??ng x?