方法选择单胎枕先露、无严重并发症及合并症的孕妇200例，随机分为观察组和对照组，每组各100例。
Methods 200 cases pregnant women of single birth, occipital presentation and without complication were randomly divided into overview group and control group, and each group had 100 cases.
方法选择单胎枕先露、无严重并发症及合并症的孕妇200例，随机分为观察组和对照组，每组各100例。
Methods 200 cases pregnant women of single birth, occipital presentation and without complication were randomly divided into overview group and control group, and each group had 100 cases.
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