survey.........

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测量是确定物体的相对位置earth.Surveying或土地测量表面上的艺术，是技术，专业和科学准确地确定点和them.Surveying之间的距离和角度的地面或三维位置一直以来有记载的历史（5000年前）开始在人类生存环境的的发展的基本要素。这是需要在规划和执行几乎所有的建筑形式的..

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what is Prismatic compass ?

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