价数规划
... 极性价数 polar number 价数规划 valence rule 价数规则 valence rule ...
在这些分子簇中稳定电子组态的价电子数符合9n - L规则。
According to "group-valence" and the rule of contracting, the size of character-picture can be contracted without changing their structure.根据“团价矩阵”和收缩规则,本方法可在不改变原字符图象结构的同时缩小字符图象。