(来学网)对小型组合机头和X线管头内变压器油的耐压要求是
  • A.
    (来学网)>5kV/2.5mm
  • B.
    (来学网)>15kV/2.5mm
  • C.
    (来学网)>20kV/2.5mm
  • D.
    (来学网)>25kV/2.5mm
  • E.
    (来学网)>4.0kV/2.5mm