Basic principle: Readings show the efficient voltage based on the normal value of samples in excess of an entire amount of periods of the basic frequencyHà N?i Ít ???c thi ??u ? Nh?t B?n nh?ng ti?n ??o Nguy?n Công Ph??ng cho r?ng anh x?ng ?áng ???c HLV Philippe Troussier g?i tr? l?i ??i tuy?n vì v?n t?p luy?n ch?m ch? ...B??c one: M? ???ng web