题目内容
关于枕先露的分娩机转，正确的是
2021-10-12
A.胎头进入骨盆入口时以枕下前囟径衔接
B.胎头降至骨盆底时开始俯屈
C.当胎头在中骨盆开始内旋转.
D.宫缩和腹压促使胎头仰伸
E.分挽过程中胎头呈持续性下降
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