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【单选题】
对于枕先露的分娩机制的含义，下列哪项是不恰当的A.
内旋转是胎头最低的枕部在盆底受肛提肌收缩力而被推向母体前方，即小囟门被推转至耻骨弓下方
B.
胎头进入骨盆入口时以枕下前囟径衔接
C.
俯屈、内旋转、、外旋转等动作都贯穿于下降过程中
D.
俯胎头下降至骨盆轴弯曲处即盆底肛提肌的阻力而发生的
E.
是在枕骨下部(粗隆)到达耻骨联合下缘时发生的
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A.
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B.
it was the first commercial mountain bike
C.
its public showing last weekend aroused many people's curiosity
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