The research of copolymerization of ethylene and diolefin has theory value as well as practical significance.乙烯和共扼二烯烃的共聚合的研究不仅具有理论价值而且还有实际意义.In addition, the copolymerization of conjugated diolefin is the base to explore...

n.二烯...

diolefin的音标：diolefin的英式发音音标为：[daɪ'əʊləfɪn]diolefin的美式发音音标为：[daɪ'oʊləfɪn]...