题目内容
下列关于正常枕先露分娩机制的叙述，正确的是
2021-11-05
A.下降，衔接，内旋转，俯屈，仰伸复位，外旋转
B.衔接，俯屈，内旋转，下降，仰伸复位，外旋转
C.衔接，下降，俯屈，内旋转，仰伸复位，外旋转
D.下降，俯屈，衔接，内旋转，仰伸复位，外旋转
E.衔接，下降，内旋转，俯屈，仰伸复位，外旋转
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