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

环氧化，环硫化乙烯亚胺也可以按类似于环氧?胱拥幕?理进行聚。

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

评述了调节发、特性、安全性及其在中国应用前景。