A.用汽油或丙酮擦拭干凈 B.只能用汽油擦拭干凈 C.只用丙酮擦拭干凈 D.用棉花擦拭干凈
A.逐個(gè)多次放電 B.全部一次放電 C.全部多次放電
A.0.2~0.5m B.1.0~1.5m C.1.8~2.5m D.3.0~3.5m