1.The method was established for purification of diflubenzuron by crystal technique with mixed solvents.

1.本文论述了利用——结晶法提纯脲的析技术。

2.A new typal insecticide, its generation, physical and chemical properties, insecticidal mechanism, insecticidal characteristic and synthesis of diflubenzuron are introduced.

2.介绍了新型杀──脲的发现、理化性质、杀机理、杀特点及成方法。