Several non-dimensionalization changings of single-index data sequence and their characteristics are studied in this paper.
灰色模型是一种指数模型 ，它对于符合指数规律的观测数据序列具有较高的精确度。
2
Conclusions: Ultrasonography of the gallbladder-wall changings plays an important role in judging the severity of liver parenchyma and guiding treatment of hepatitis and liver cirrhosis patients.
结论：胆囊壁的声像改变对肝炎、肝硬化患者肝实质损伤严重程度的判断以及指导临床治疗具有重要意义。
3
The changings of decarburization thickness were investigated by metallographic method. Then verified the accuracy of experimental datas in theory, and analyzed the protective mechanism of coating.