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【单选题】
关于头先露分娩机转，下列哪项悬错误的( )A.
下降贯穿在整个分娩过程中，是间断性的
B.
俯屈的目的是以枕下前囟径代替枕额径以适应产道，继续下降
C.
内旋转是使胎头适应中骨盆及出口大于前后径的特点，有利于胎儿娩出
D.
主要是子宫收缩、腹肌收缩与肛提肌收缩的共同作用
E.
外旋转是由于肩的内旋转所引起的
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