From the engineering construction the characteristics set out, to curved face clear water concrete and space type steel the construction construction proceeds to chooses to order, fixed position.
从工程结构特点出发，介绍对曲面清水混凝土及空间异型钢结构施工进行选点、定位、复测。
Make use of constant measure of second order curved face, and judge the space figure that arrive the fixed point and the fixed flat surface (fixed straight line) distance's ratio is a constant.
利用二次曲面的不变量判定到一定点和一定平面(定直线)的距离之比为常数的空间点的轨迹。
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