单项选择题
A.0.4-0.6mm线径心线 B.0.6-0.8mm线径心线 C.0.9-1.2mm线径心线
A.直径85x500mm B.直径65x500mm C.直径55x400mm D.直径90x600mm
A.100V B.250V C.500V D.1000V