在重大建筑物施工控制中，放样方法本身的精度估算及分析是制定测量方案的重要依据。
In construction of important and large buildings, a precision estimation and analysis of layout method are important data for working out survey plan.
把椭圆线简化为四段圆弧，是手工作图或施工放样的常用方法。
It's the common way to predigest the ellipse to four arcs in hand-drawing or construction lofting.
测量是建筑施工中非常重要的工作，建立合适的控制网，选择合适的放样方法，使测量快速准确。
Survey is very important for building construction. Establishment of the suitable control net and choice of the proper methods of survey can get quick and accurate survey.
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