METHODS: The parallel double blind randomized control clinical trial was used.
方法：采用平行双盲随机对照研究。
Methods: a clinical trial by randomized, double-blind, parallel control was conducted. The control drug was imported cefmetazole.
方法：采用双盲、随机、平行对照试验设计，以进口头孢美唑钠为对照药物。
Methods Multi-center randomized double-blind trial with positive control and split-mouth comparison was designed.
方法多中心随机、双盲、阳性药物对照、左右半口对照设计。
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