(来学网)胸部正位摄影,规定体表入射剂量小于
  • A.
    (来学网)0.3mGy
  • B.
    (来学网)5mGy
  • C.
    (来学网)3mGy
  • D.
    (来学网)10mGy
  • E.
    (来学网)0.5mGy