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。
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。
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。
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。
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