(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)0.5mGy
  • C.
    (来学网)0.8mGy
  • D.
    (来学网)1.0mGy
  • E.
    (来学网)1.2mGy