A.三角布置 B.水平布置 C.垂直布置 D.不規(guī)則布置
A.電暈放電與間隙放電 B.電暈放電與沿面放電 C.間隙放電與沿面放電 D.沿面放電與局部放電
A.10 B.20 C.30 D.40