Basic principle: Readings present the productive voltage depending on the average worth of samples around a complete quantity of durations of the fundamental frequencyTi?n ??o Nguy?n Công Ph??ng ???c CLB CLB Yokohama cho phép v? Vi?t Nam h?i quân ??i tuy?n qu?c gia s?m nhi?u ngày so v?i quy ??nh c?a FIFA.Tra?nh tr???ng h??p ?ê?n t?i ca?c ?i?a