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【单选题】
下列关于产力的叙述错误的是______。A.
将胎儿及其附属物从子宫逼出的力量，称为产力
B.
临产后起主要作用的是宫缩力
C.
宫缩力的特点是节律性、对称性和极性、缩复作用
D.
腹肌和膈肌收缩力(腹压力)是第二产程的主要辅助力量
E.
腹肌收缩胎先露在骨盆内的内旋转起重要作用
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