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wo guo qi da shui xi wu ran ri zhong
Pages: 25
Year: Issue:  3
Journal: Resources Economization and Comprehensive Utilization

Abstract: 我国七大水系污染日重据国家环保局提供的消息,我国江河湖库水域普遍受到不同程度的污染,六大水系污染呈加重趋势,工业发达城镇附近的水域污染尤为突出。长江全流域水质符合一、二类标准的为45%,符合三类标准的占31%,属于四、五类标准的占60%。主要污染指标...
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