... diffraction grating 衍射光栅 diffraction group 衍射群 diffraction pattern 衍射圈 ...
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Adopting the space-group extinction rule and simulating the electron diffraction pattern with computer, this paper proposed a new method for selecting the reduced quadrangle.
引入空间群消光规律，用计算机模拟电子衍射图，提出选取约化四边形的新方法。
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