本文依据灰色系统理论，采用灰色定权聚类方法，根据国家环境质量标准，对南京市近三年地表水的质量进行评估。
According to the National Standard of Environmental Quality, we analyzed and assessed the surface water quality in Nanjing in the recent three years.
本文依据灰色系统理论，采用灰色定权聚类方法，根据国家环境质量标准，对南京市近三年地表水的质量进行评估。
According to the National Standard of Environmental Quality, we analyzed and assessed the surface water quality in Nanjing in the recent three years.
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