... 滑移对称面 glide plane of symmetry 常对称面 common plane of symmetry 双对称面 disymmetric face ...
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It is known that the projection of the intersection of quadrics with common plane of symmetry on this plane is a curve of second order.
具有公共对称平面的二次曲面的交线在该平面上的投影为二次曲线。
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