... productive property生产资财 projective property射影性质 proknock properties of gasoline汽油的助爆震性能 ...
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Cross ratio and element at infinity are two important concepts with projective geometry and primary tools in considerate projective property of figures.
交比和无穷远元素是射影几何中的两个重要概念，它们是探讨图形射影性质的主要工具。
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