• Taking southern mountainous land of Ningxia as an example, the paper briefly introduces the ridge coefficient calculation process.

    本文以宁夏南部山区简要地介绍田坎系数测算过程。

    youdao

  • Taking southern mountainous land of Ningxia as an example, the paper briefly introduces the ridge coefficient calculation process.

    本文以宁夏南部山区简要地介绍田坎系数测算过程。

    youdao

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