The hardest faults to seek out are those that come about only Now and again—intermittent situations. They are often attributable to negative connections, dust, Grime, corrosion or just broken wiring or connectors. 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 tr