Objective: to probe into the effect of N 2O inhalation as a way of analgesic anesthesia for patients undergoing artificial abortion.
目的：探讨笑气吸入镇痛麻醉在人工流产中的疗效。
Objective: to probe into the effect of N 2O inhalation as a way of analgesic anesthesia for patients undergoing artificial abortion.
目的：探讨笑气吸入镇痛麻醉在人工流产中的疗效。
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