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【单选题】
子宫收缩的特点正确的是( )
A.
每次收缩由强到弱,逐渐消失
B.
宫缩时胎盘血循环不受影响
C.
宫缩起点在子宫底部
D.
上段收缩,向下逐渐减弱
E.
收缩时肌纤维缩短,舒张时恢复原来的长度
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