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二面角的棱未给出的二面角问题是二面 角的难点,本文以2004年北京市春季的一个高 考题为例,谈谈无棱二 面角的解题策略．
The problem of the dihedral angle that is not given by the dihedral rib is the difficulty of the dihedral angle. This paper uses a high school exam in the spring of 2004 in Beijing as an example to discuss the problem-solving strategy of the ambiguous dihedral angle.