Objective to evaluate the safety and efficiency in pain control after laparoscopic cholecystectomy of Fentaynyl transdermal system combined with local infiltration of ropivacaine.

目的研究多瑞吉联合罗哌卡因局部浸润用于腹腔镜胆囊切除术后镇痛的效能和安全性。

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By experimentation, comparison flame brazing's some limitations such as infiltration, working efficiency, working condition are poor and easy to burn out loop's insulating.

通过实验比较，阐述了气体火焰钎焊在焊接转子并头套时渗透率不高，生产效率低，生产环境差和容易烧坏线圈上的绝缘层等缺陷。

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