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.
肌肉最大收缩力与负荷的大小成正比；肌肉收缩的最大加速度可能是个常数。
The maximum contraction force of muscle is directly proportional to it's load and the contraction acceleration of muscle may be a fixed number.
正常对照组颈动脉收缩期径向最大运动速度高于冠心病颈动脉无斑块部位的测值，差异有统计学意义（P＜0.05）；
The systolic maximum velocity of carotid with normal contract was higher significantly than that of carotid without plaque with CAD(P<0.05).
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