Basic principle: Readings display the successful voltage determined by the common value of samples about a complete range of periods of the fundamental frequencysixteen ??i bóng hàng ??u t?i Vi?t Nam h?a h?n s? mang ??n nh?ng tr?n c?u h?p d?n nh?t cho ng??i hâm m? n??c nhà.T.Huy XSMB: Gi?i ??c bi?t k?t qu? x? s? Mi?n B?c ???c bao nhiêu v?y m?i