absolute contrasting method的用法和样例：
- Methods: The random contrast methods were adapt.
- 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.
- 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.
- 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.