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在立体几何中,如何正确地作出“垂足”,确是一个难且重要的问题,本文从三个方面讲了作垂足的思路,对学习有帮助。
In the three-dimensional geometry, how to correctly make a “vertical foot” is indeed a difficult and important issue. This article discusses the thinking of making footwork from three aspects and is helpful for learning.