ethylenen.乙烯ethyleneimino-亚乙基氨基ethylene linkage[化] 烯键; 碳-碳双键ethylene complex乙烯联合装置ethylene diamide亚乙基二酰胺Ethylene Content乙烯含量ethylene hydride乙烷ethylene raw oil乙烯原料油ethylene bromide溴化乙烯,1,2-二溴乙烷ethylene project乙烯工程ethylene cracker乙烯装置