?ây là gi?i ??u th? thao ?i?n t? th? hai v?i t? cách là s? ki?n tranh huy ch??ng trong m?t cu?c thi ?a môn th? thao ???c ?y ban Olympic Qu?c t? ch?p thu?n. Tham kh?o[s?a Harmonics are periodic distortions of voltage, current, or ability sine waves. Harmonics in electric power distribution systems tend to be a result of non-linear loads such as