n.取代
The substituent effects of ethoxy groupswere studied on the chemical composition and properties of plasma polymers. 研究了乙氧取代基对聚合物化学组成和性能的影响。
The fluorescence intensity of porphyrin also relates to the substituent positions on the phenyl groups. 此外，荧光强度还与卟啉的苯环上取代基的取代位置有关。
