The working principle, the structure and the constitution of the rotation ring for the artificial abortion apparatus are introduced. The preparation method of the rotation ring is discussed.
介绍旋动式人工流产器的工作原理、结构及组成，探讨旋流环的制备方法。
The control group adopted the usual method of artificial abortion.
对照组按人工流产术常规进行操作。
The control group adopted the usual method of artificial abortion.
对照组按人工流产术常规进行操作。
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