(来学网)心前超声多普勒能检测到的气栓最小气体量是
  • A.
    (来学网)0.25ml
  • B.
    (来学网)5ml
  • C.
    (来学网)10ml
  • D.
    (来学网)25ml
  • E.
    (来学网)50ml