1. The method was established for purification of diflubenzuron by crystal technique with mixed solvents.
   本文论述了利用混合溶剂——结晶法提纯除虫脲的分析技术。
2. A new typal insecticide, its generation, physical and chemical properties, insecticidal mechanism, insecticidal characteristic and synthesis of diflubenzuron are introduced.
   介绍了新型杀虫剂──除虫脲的发现、理化性质、杀虫机理、杀虫特点及合成方法。

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