(来学网)正常成人二尖瓣口的面积为
  • A.
    (来学网)1~2cm2
  • B.
    (来学网)2~3cm2
  • C.
    (来学网)3~4cm2
  • D.
    (来学网)4~6cm2
  • E.
    (来学网)5~8cm2