(来学网)供给X线管的能量,有百分之多少转换成X线
  • A.
    (来学网)小于1%
  • B.
    (来学网)0.04
  • C.
    (来学网)0.1
  • D.
    (来学网)0.85
  • E.
    (来学网)0.99