Cân n?ng c? t?ng gi?m nh? chuy?n ??ng c?a yoyo, nghe có v? bình th??ng nh?ng l?i là m?t hi?u ?ng ?n kiêng ph? bi?n, ?nh h??ng không nh? ??n s?c kh?e c?a b?n.Harmonics are periodic distortions of voltage, latest, or energy sine waves. Harmonics in electric power distribution systems will often be because of non-linear hundreds for example swit