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在全面解决水土保持,防治土壤侵蚀问题时,应选用当时当地具体条件下最为经济有效的水土保持防蚀措施,以使投资
In the comprehensive solution to the problems of soil and water conservation and soil erosion prevention and control, we should select the most economical and effective measures for soil and water conservation under local conditions so as to make the investment