ethylenen.乙烯
ethylene unit乙烯装置
ethylene ketal乙二醇缩酮
ethylene units乙烯装置
ethylene plant乙烯厂
ethylene imine吖丙啶,哌嗪
ethylenenationn.乙烯化作用
ethylene union烯键
ethylene group乙烯基
ethyleneglycol乙二醇
ethylene oxiden.环氧乙烷