系统地分析了未变质煤的 X 射线衍射图。
The X-ray diffraction patterns of unmetamorphosed coals have been systematically analyzed.
劳埃衍射图进一步证明，样品是高质量单晶。
Laue back diffraction patterns confirmed the good quality of the samples.
所得样品用X-射线衍射图及红外先谱图进行表征。
These samples were characterized by X-ray diffraction patterns and infrared spectra.
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