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方法对2 80例不同孕期的孕妇用超声骨密度测定仪测量跟骨骨密度（BMD） ，同期选择30例正常健康非孕期妇女做对照组。
Methods 280 cases gravidas in different gestation were determined in calcaneum bone density by using the apparatus. 30 cases normal healthy non-pregnant women were selected as the control group.
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