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1·Those crystal planes should be selected such that their Miller indices are lower and the planes have high symmetry.

选择这样几组晶面，使它们的密勒指数较低且具有对称性。

2·The orientations of all developing facets in the crystals and their Miller indices have been determined by means of X-ray and optical method.

用X射线和光学方法测定了各个显露面，确定其密勒指数。

3·In this paper, a method of lattice transformation is introduced to demonstrate the relational expression between Miller indices and interplanar spacing in base-centered monoclinic lattice.

采用晶格变换的方法证明了在底心单斜格子中密勒指数与晶面间距的关系式。