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问题 单项选择题

初产妇活跃期延长是指时间超过（）

A.4h

B.5h

C.6h

D.7h

E.8h

答案

参考答案：E

选择题

下图中四个平行箭头指向东方的是

[ ]

A、①

B、②

C、③

D、④

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文段（四）

                                                                                       

                                                                                       

                                                                                       

                                                                                       
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