堆场类建筑的外墙一般按照三边固定一边自由的混凝土双向板，板承受荷载为三角形荷载。
The external wall of a warehouse is a reinforced concrete two-way slab which has one simply supported end and three fixed ends, bearing load of triangle.
推导出由特征多项式的系数表示的线图（无重边图）中圈的个数，双向结点对个数，单向结点对个数及简单图中有向三角形个数的计算公式，等等。
The formulae for the number of loops, edges, triangles, pairs of two-way nodes and pairs of one-way nodes are deduced by the coefficients of a characteristic polynomial, so on.
基于双向映射的曲面层次网格化展开算法展开高度复杂的三角化曲面。
High complex surfaces are flattened with hierarchy meshes based on bi-mapping.
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