ethylenes乙烯属烃ethylenen.乙烯ethylene tribromide三溴代乙烯ethylene technology乙烯技术ethylene produetion乙烯ethylene brassylate巴亚基酸次乙酯ethylenediamine-Nn.乙二胺二乙酸ethylene compressor乙烯压缩机ethylene halohydrin卤代乙醇ethylene bottom oil乙烯焦油ethylene urea resin乙撑脲树脂ethylene dichloride二氯化乙烯,乙撑二氯,1,2-二氯乙烷