目的评价肝素对改善妊娠中晚期脐动脉收缩期最大血流速度（S）与舒张末期血流速度（D）的比值异常的临床效果。
ObjectiveTo evaluate the efficiency of heparin on the ratio of peak systolic to least diastolic flow velocity (S/D) of umbilical artery flow velocity waveforms at second-trimester pregnancies.
这一事件发生的原因是由于瓜德鲁普世末期全球性海退引起的，事件持续的时间较长，相当于卡匹敦期的晚期。
It is inferred that the cause of the event was a global regression at the end of the Guadalupian, and the event continued for a long time that is equal to the late Capitanian period.
这一事件发生的原因是由于瓜德鲁普世末期全球性海退引起的，事件持续的时间较长，相当于卡匹敦期的晚期。
It is inferred that the cause of the event was a global regression at the end of the Guadalupian, and the event continued for a long time that is equal to the late Capitanian period.
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