(来学网)在二维声像图上添加彩色多普勒血流显示,则帧频会
  • A.
    (来学网)增高
  • B.
    (来学网)降低
  • C.
    (来学网)不变
  • D.
    (来学网)增高2~3倍
  • E.
    (来学网)降低2~3倍