Objective to research the impact of formaldehyde air pollution on fractal characteristics of Osmanthus Fragrans leaves and the application of fractal theory in formaldehyde air pollution monitoring.
目的探讨甲醛空气污染对桂花叶片分形特征的影响以及分形理论在甲醛空气污染监测中的应用。
Production theory and processes of modified urea-formaldehyde resin used in oil well water shutoff and some influence on product performance resulted by main factor in the production are introduced.
介绍了适用于油田油井堵水用的改性脲醛树脂的生产原理和工艺，以及生产中的关键因素对产品性能的影响。
It introduces melamine starch and other modifier modified the theory production method and quality standard of 5011 urea - formaldehyde adhesive.
介绍了用三聚氰胺、木薯淀粉等改性5011脲醛树脂的反应原理，生产方法及质量标准。
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