二级河道

二级河道二级河道
  1. 天津市二级河道治理的设计理念与工程效果

    Design Idea and Engineering Effect of Second Grade River Course Treatment in Tianjing City

  2. 天津市也需要一套合理的治理方案来改善、保持二级河道水质。

    Tianjin is also in great need of a set of reasonable programs to improve and maintain water quality of secondary river .