单项选择题
A.40周 B.38周 C.42周 D.26周 E.30周
A.子宫口 B.子宫颈 C.子宫底 D.子宫角 E.子宫体
A.30s B.40s C.45s D.50s E.60s
A.30s B.15s C.40s D.<30s E.>30s
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