trong m?t kho?n th?i gian nh?t ??nh tr??c khi ?i?u ch?nh, t?t nh?t b?n nên dùng ph??ng pháp t? ??ng ho?c xây d?ng hàm ?? ki?m tra v?i d? li?u.Readings clearly show the helpful voltage dependant on the average worth of samples over a complete number of intervals of the elemental frequencyTr??ng ban biên t?p: Nguy?n Thanh Ng?c Ch? ???c d?n ng