A.8mm B.12mm C.10mm D.6mm
A.引弧、通電、電渣、頂壓 B.引弧、電弧、電渣、斷電 C.引弧、電弧、電渣、頂壓 D.引弧、電弧、電渣、卸渣
A.500 B.200 C.300 D.10