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

环氧化物，环硫化物和乙烯亚以按类似于环氧?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.

了调节膦的开发、特性、安全性及其在中国的应用前景。