(来学网)腹腔动脉DSA,若需观察门静脉,曝光时间应为
  • A.
    (来学网)1~5s
  • B.
    (来学网)5~10s
  • C.
    (来学网)10~15s
  • D.
    (来学网)15~20s
  • E.
    (来学网)20~30s