Basic principle: Readings present the effective voltage based on the standard value of samples in excess of a whole number of intervals of the elemental frequency Gi? x? s? Mi?n B?c l??ng truy c?p trên h? th?ng Web-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:To be certain fairness, 123