Theory: Readings exhibit the efficient voltage determined by the average price of samples above a whole quantity of intervals of the fundamental frequency Gi? x? s? mi?n nam l??ng truy c?p trên h? th?ng Sites Minh Ng?c r?t l?n nên các b?n c?n l?u ý m?t s? v?n ?? sau ?? ??m b?o xem tr?c ti?p ?n ??nh nh?t:B??c one. Ng??i ch?i v?n l?a ch?n backli