V?i t? l? th?ng c?c k? t??i sáng, m?i l?n tham gia, ng??i ch?i có c? h?i tr? thành ng??i chi?n th?ng, b?t ch?p vi?c h? là ng??i m?i hay là m?t cao th? lô ?? dày d?n kinh nghi?m.Harmonics are periodic distortions of voltage, recent, or energy sine waves. Harmonics in electric power distribution units are frequently a result of non-linear hund