A.大气过电压、操作过电压 B.大气过电压、工频过电压、谐振过电压 C.大气过电压、工频过电压 D.大气过电压、工频过电压、谐振过电压、操作过电压
A.3B.5C.6D.10
A.20mm B.50mm C.100mm D.125mm
A.10倍 B.7倍 C.5倍 D.3倍