Gi?i m?i (bao g?m t?t c? gi?i nào có s? thay ??i, c?p nh?t m?i ho?c ?i?u ch?nh)The hardest faults to discover are people who materialize only Now and again—intermittent gatherings. They may be brought on by negative connections, dust, dirt, corrosion or just damaged wiring or connectors.The toughest faults to find are those who occur only once