常見(jiàn)例句用作名詞 (n.)The research of coplymerization of ethylene and conjugated diolefin has theory value as well as practical significance.乙烯和共扼二烯烴的共聚合的研究不僅具有理論價(jià)值而且還有實(shí)際意義。 返回 diolefin