Epoxides, episulphides and ethylene imines also polymerize via similar cyclic onium ion mechanisms.

环氧化合物，环硫化合物和乙烯亚胺也可以按环氧?胱拥?行聚合。

This paper discussed study on the development physi cal and chemical properties,crop safety,and application prospect of fosamine amm onium in China.

评述了调节膦的开发、特性、安全性及其在中国的应用前景。