Each spatial geometry value contains an SRS id (or SRID) to identify the associated SRS.
每个空间几何值包含一个SRS ID(即SRID)来标识相关联的SRS。
A student who has trouble with algebraic equations, for instance, may have a talent for spatial geometry.
举例来说，一个学生可能在代数方程序的学习上有困难，但他可能在空间几何方面有天赋。
Base on the theory of analytical spatial geometry and the classification of sheet metal products, the typical sheet metal's unfolding methods are analyzed and the mathematical models are built.
根据钣金件的分类，利用解析画法几何的理论，对典型钣金件进行展开分析并建立它们的展开线数学模型。
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