Announced Beijing area water - earth - configuration of existence of the contaminant in biology system and change shift change the rule, mastered skill of main contaminant adjusting control.

揭示了北京地区水-土-生物体系中污染物存在形态和迁移转化规律，把握了主要污染物调控技术。

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Based on the grey system theory, a grey assessment model of groundwater quality is built by combining the method of grey relational grade analysis and the method of single factor contaminant index.

以灰色系统理论为基础，把灰色关联度分析方法和单因子污染指数法相结合，构造了一种适合于评价地下水质量的灰色模型。

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For the improvement of the standard system of rice noodles, the main problems in the present three rice noodle standards, such as contaminant residues and food additives, were investigated.

从完善我国米粉标准体系的角度，对米粉现有的三个标准在重要安全限量、食品添加剂等方面存在的问题进行了分析。

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