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, latest, or ability sine waves. Harmonics in electricity distribution units are sometimes brought on by non-linear masse