产程不断进展,当宫口开大到多少时,妊娠足月胎头方能通过A.7~10cm B. 7~8cm C.2~3cm D.10cm E.2~4mm

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问题 产程不断进展,当宫口开大到多少时,妊娠足月胎头方能通过

选项 A.7~10cm
B. 7~8cm
C.2~3cm
D.10cm
E.2~4mm

答案D

解析
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