单选题:离线封闭母线与设备连接时,为了便于拆卸,连接处一般采用螺栓连接,且接触面需镀银处理,请问当导体额定电流大于下列哪项数值时

题目内容:
离线封闭母线与设备连接时,为了便于拆卸,连接处一般采用螺栓连接,且接触面需镀银处理,请问当导体额定电流大于下列哪项数值时,应采用非磁性材料紧固件?(  ) A.1000A
B.2000A
C.2500A
D.3000A

参考答案:
答案解析:

某220kV变电站内设有两台主变压器,变压器铁芯为冷轧硅钢片,过电压一般不超过下列哪个数值时,可不采取保护措施?(  )

某220kV变电站内设有两台主变压器,变压器铁芯为冷轧硅钢片,过电压一般不超过下列哪个数值时,可不采取保护措施?(  )A.411.5kV B.291.0kV

查看答案

Please put Mary' s things back where you found them ________

Please put Mary' s things back where you found them __________ she won' t know

查看答案

What is the best title for the passage?

What is the best title for the passage?A.Unforgettable Experiences B.Remarkable

查看答案

--Tommy, do you know if Frank __________ to the theatre with

--Tommy, do you know if Frank __________ to the theatre with us this Sunday if i

查看答案