(来学网)肺吸气相与呼气相在获得同等密度影像时X线量约相差
  • A.
    (来学网)<10%
  • B.
    (来学网)10%~20%
  • C.
    (来学网)30%~40%
  • D.
    (来学网)60%~70%
  • E.
    (来学网)>80%