The difference of ammonia, amido, amino group and quaternary ammonium salt, some common wrong expressions on them, and the valence state of phosphorus in some of its oxyacid were pointed out.

• 指出了氨、氨基、胺基及季铵盐的区别及其常见错误表述,以及磷的几种含氧酸中磷的价态,并着重指出没有“次亚磷酸”的叫法。