x? s? ki?n thi?t B? tr??ng Tài chính H? ??c Ph?c ch?t v?n casino Vân ??nHarmonics are periodic distortions of voltage, existing, or ability sine waves. Harmonics in electrical power distribution devices tend to be caused by non-linear hundreds such as switched method dc electricity materials and adjustable pace motor drives.Trong tr??ng h?p vé