Methods: The random contrast methods were adapt. 方法：采用随机对照开放试验方法。
The formal character of this absolute contrast, the left () the child should be careful and tenderness, but also to let everyone enjoy the full essence of a symbol of strong and the atmosphere, "Hou. 而正式这种性格上的绝对反差，却让()孩应有的细致和柔情，也让大家领略到了一个骨子里充斥着刚毅、坚强与大气的“侯子”。
The simulation test shows: compared with the contrast method, DS-PSO algorithm has better convergence accuracy and higher evolution velocity. 对测试函数的仿真实验表明,与对比方法相比较,DS_PSO算法具有更好的收敛精度和更快的进化速度。
Among 13 cases of fundal gastric cancers diagnosed by pneumobarium double contrast method, 8 cases were confirmed by pathology, 1 case was small gastric cancer. 胃肠气钡双重对比造影法初步诊断为胃底胃癌的13例中，行内镜取活检病理证实为胃底胃癌的8例（符合率为61.
Based on close research on the theory of optical transfer function, this dissertation offers an practical arrangement to test the MTF of a lens using contrast method. 本课题在充分研究光学传递函数理论的基础上，给出了对比度测量镜头MTF参数的实验设计。