The method is: Measure area size, fore-and-aft or lay off is transverse in the center of the ground line, repass does vertical line to be become namely in the center of this line.
英
美
释义
方法是:测量地面尺寸,地面中心划出纵向或横向线一条,再通过此线的中心做垂线即成。
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