单项选择题
A.U/3B.U/V3C.3UD.V3U
A.15B.20C.25D.49.03(0.5kg/cm2)
A.空气断路器B.户内式C.额定电压12kVD.额定电流31.5kA
A.8h,120hB.10h,120hC.8h,240hD.10h,240h
微信扫一扫,加关注免费搜题