The detergent substitutes for normal series products of ODS and APEO which are harmful to human environment, and has the advantages of toxic-free property and environment preservation.
该清洗剂替代了常规的危害人类环境的ODS系列产品以及APEO系列产品，具有无毒、环保的特点。
In this paper, based on the relation between normal subgroup and congruence, another depiction of normal series power semigroup is given from the angles of congruence by the method of analogy.
首先在正规子群与同余的关系的基础上，采用类比的方法，从同余的角度给出了群的正规列幂半群的另一种刻画。
In this paper, based on the relation between normal subgroup and congruence, another depiction of normal series power semigroup is given from the angles of congruence by the method of analogy.
首先在正规子群与同余的关系的基础上，采用类比的方法，从同余的角度给出了群的正规列幂半群的另一种刻画。
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