The hardest faults to find are those who occur only Every now and then—intermittent functions. They are often due to undesirable connections, dust, Filth, corrosion or simply damaged wiring or connectors.x? s? hôm nayxsmtsxmtx? s? mi?n trungk?t qu? x? s? mi?n trungkqxsmtxsmt hôm nayx? s? mi?n trung hôm nayx? sô hôm nayB?m ? ?? theo dõi VOH