By means of the existing measurement control points on the ground elevation for lofting, determine the excavation depth.

利用已有的丈量控制点对原地面高程进行放样，确定开挖深度。

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By means of the existing measurement control points on the ground elevation for lofting, determine the excavation depth.

利用已有的丈量控制点对原地面高程进行放样，确定开挖深度。

youdao