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.The hardest faults to search out are people who transpire only once in a while—intermittent situations. They may be because of undesirable connections, dust, Dust, corrosion or just damaged wiring or