This paper proposes a systematic method in the design of pole-changing windings based on reversing coil techniques and the concept "the minimum symmetric coil groups".

本论文提出了一种反向法变极绕组的系统设计方法和最小对称槽号组的概念。

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Because the fiber is of chemical inertion, low surface energy, lack of polar groups, and highly symmetric methylene structure, the fiber has a high degree of crystallinity and orientation.

这是由于纤维在化学上不活泼，表面能低，表面缺乏极性基团，且是高度对称的亚甲基结构，使得纤维具有很高的结晶度和取向度。

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In this paper, we get some results of two-element generation of symmetric and alternating groups.

研究了整数环上一些典型群的二元生成问题。

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