Method of algebraical topology used in logic synthesis attained least covering, and in order to avoid audaciousness arising, auducious problem was discussed necessarily.
代数拓扑方法用于逻辑综合得到最小覆盖，为了避免可能出现冒险，需要进行冒险问题的讨论。
2
In order to improve the stability of unsaturated expansive soil slope, the method of covering the slope by geo-membrane is applied.
为了提高非饱和膨胀土边坡的稳定，采用了土工膜覆盖边坡表面的方法。
3
Some practical problems allow certain degree error of classification, in order to solve the problems, this paper extended our model and put forward the degree rough set model based covering.