Methods the ct and X-ray expression of 53 cases of spine metastatic carcinoma were analyzed and summarize imaging character of them.
方法对53例经临床获得证实的脊椎转移瘤ct和X线表现进行分析，以总结其原发瘤与转移部位之间的影像学特征。
Meterials and methods: gathered 14 cases full material of stress fibula fracture, Analysed their X - ray signs and special X - ray expression of bone tumour, and discussed diagnose of the disease.
材料与方法：收集资料完整的胖骨应力性骨折14例，对它们的X线征象及创伤性骨肿瘤样特殊X钱表现做了回顾性分析。
From the conception of X ray diffraction of electrons in an atom, the mathematical expression of X ray diffraction for an atom in a crystal cell is given.
从原子中的电子对X光散射的概念出发，对任意一个晶胞内的任意一个原子产生的X光衍射给出了具体的数学描述。
The crystallographic problems of two-dimensional crystal, such as the matrix expression, the symmetry and the systematic absence law of the crystal's X-ray diffraction, are studied.
对二维晶体的矩阵表示、对称性及其对X射线衍射的系统消光规律进行了研究，得到并证明了二维晶体的矩阵表示的二个定理和二维晶体对X射线衍射的系统消光定理。
The crystallographic problems of two-dimensional crystal, such as the matrix expression, the symmetry and the systematic absence law of the crystal's X-ray diffraction, are studied.
对二维晶体的矩阵表示、对称性及其对X射线衍射的系统消光规律进行了研究，得到并证明了二维晶体的矩阵表示的二个定理和二维晶体对X射线衍射的系统消光定理。
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