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1·The outer automorphism group of the free product of two cyclic groups is constructed, and two exact formulas for calculating its order are established.

具体地构造出两个有限循环群的自由积的外自同构群，并给出了其阶的计算公式。

2·Conclusions: Under static and cyclic bending conditions, stiffness in group 2 was significantly lower than that in group 1.

结论：静态及循环载荷条件下，第二组的抗弯刚度明显小于第一组。

3·The results showed that the properties of additives with branched group and cyclic hydrocarbon were excellent.

结果表明，带支链及环状结构的添加剂极压抗磨性能最好。