那本有笔者名字的共笔 第一页有个小审补充被卡掉了 内容如下 小审补充 ˇFriedman original research in 1955 defined 3 stages of labor. (A)The first stage starts with uterine contractions leading to complete cervical dilation and is divided into latent and active phases. (a)In the latent phase, there are irregular uterine contractions but slow and gradual cervical effacement and dilation. (b)The active phase is demonstrated by an increased rate of cervical dilation and fetal descent. (c)The active phase usually starts at 3-4 cm cervical dilation and is subdivided into the acceleration, maximum slope, and deceleration phases. (B)The second stage of labor ranges from complete dilation to the delivery of the infant. (C)The third stage of labor involves delivery of the placenta. 帮我修正一下 谢谢^^ --

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