... general proposition 一般命题 general quadric 一般二次方程 general quadrilateral 一般四边形 ...
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general quadric surface [数] 一般二次曲面
The main content: vector algebra, plane and linear space, special surfaces and secondary surfaces, general quadratic surfaces and general quadric surface.
主要内容有：向量代数、空间的平面和直线、特殊曲面和二次曲面、一般二次曲面和一般二次曲面。
One of difficulties in descriptive geometry theories is to draw the intersection created by two general position intersecting quadric surfaces.
画法几何学中的难点之一是求解两一般位置二次曲面的交线。
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