元素置换

本文利用使有限半群的元素的置换对应于其元素之积的手段，我们将解释两种有限半群结合律的统筹检验法。

In this paper , by making permutations of the elements of a finite semigroup correspond to the products of its elements , we shall explain two general methods of verification as a whole of the associative law of finite semigroups .

结果表明，基体与镀层之间存在氧、钠元素，锌置换层未完全去除，无铜过渡层，铬镀层太厚，影响了镀层的结合力，导致起泡缺陷。

The results indicate that as oxygen and sodium exist in the matrix , the zinc plating is not sufficiently removed , the chromium plating layer is too thick and no copper plating layer can be found with the result that the plating cohesion is weakened and blistering occurs .

追求独特的视觉效果，包括对相似图形元素的组合、创新，追求图形元素的拟人化，对图形元素的创意置换和变形等五个方面。

The pursuit of unique visual effects , including graphic elements similar to a combination of innovation , the pursuit of the anthropomorphic graphic elements , graphic elements of the creative aspects of displacement and deformation . 3 .