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【单选题】
妊娠期母体生殖系统变化正确的是A.
妊娠晚期子宫呈不同程度的左旋
B.
子宫血流量较非孕期增加8～10倍
C.
妊娠晚期，子宫出现不规则的无痛性收缩
D.
子宫峡部在临产时被拉长至20cm以上
E.
卵巢在妊娠期仍有排卵功能
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