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

环氧物，环物和乙烯亚胺也可以按似于环氧?睦胱拥幕?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.

评述了调膦的开发、特性、安全性及其在中国的应用前景。