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求二面角的大小一直是立体几何高考的热点问题之一,也是同学们感到难以把握的问题.尤其是求无棱二面角的大小时,很多同学更是显得束手无策.
The size of the dihedral angle has always been one of the hot topics in the entrance geometry of the three-dimensional geometry. It is also a problem that the students find difficult to grasp. In particular, when seeking the size of the dihedral angle, many students are helpless.