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初产妇，24岁，妊娠38周，阵发性腹痛10小时，宫缩15～20分钟1次，持续30秒，宫口开大2cm。

A.子宫收缩节律性异常
B.腹压运用不当
C.子宫收缩极性异常
D.肛提肌收缩作用异常
E.腹肌和膈肌收缩力异常

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