(来学网)脐带绕颈时,脐动脉S/D为多少时提示胎儿宫内窘迫:
  • A.
    (来学网)大于3.0
  • B.
    (来学网)大于2.0
  • C.
    (来学网)大于1.0
  • D.
    (来学网)小于2.5