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我们从１９９１年１２月至１９９６年１２月观察了４６例晚期妊娠行一次性低温水囊的引产效果，并与同期放置一次性常温水囊（简称常温水囊）进行对比，报告如下。１ 资料与方法１．１ 研究对象 选择１９９１年１２月至１９９６年１２月我院及山东省立医院入院待产的单胎头?
We observed from December 1991 to December 1996 46 cases of late pregnancy one-time low temperature balloon induced abortion effect, and with the same period placed at room temperature water balloon (referred to as room temperature balloon) for comparison, the report is as follows. 1 Materials and Methods 1.1 The subjects selected December 1991 to December 1996 in our hospital and Shandong Provincial Hospital admitted to hospital for the birth of a single fetal head?