在黄河的枯水期,如果经过�学的规划,在保证现大堤的安全的情况下,放开河底的挖沙,会不会有效降低河床? 知乎 Template




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tomski在黄河的枯水期,如果经过�学的规划,在保证现大堤的安全的情况下,放开河底的挖沙,会不会有效降低河床? 知乎 coloring