9.华北地区水资源供需矛盾突出的原因是 �人口稠密经济�达需水量大 �降水较�径流量不足�地面硬化降水利用率低�水资源污染浪费 Template




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tomski9.华北地区水资源供需矛盾突出的原因是 �人口稠密经济�达需水量大 �降水较�径流量不足�地面硬化降水利用率低�水资源污染浪费 coloring