Ten of them were identified. They are ethylene, propylene, isobutane, cyclobutane, three isomeric butenes, methylethylether, ethyl isopropyl ether, and ethyl acetate.
它们是乙烯，丙烯，异丁烷，环丁烷，丁烯类化合物三个，甲基乙基醚，乙基异丙基醚，乙酸乙酯。
2
In four extracts from PMEW treated with methyl alcohol and water, petroleum ether, chloroform and ethyl acetate, extract rate of methyl alcohol and water was the highest.