甲烷和丙烷是烷烃。Methane and propane are alkanes.丙烷气钢瓶a propane gas cylinder亚胺基杂环丙烷季铵盐的阳离子,一定是按协同反应的方式开环的.The aziridinium ions must all be opened by a concerted process....
They managed to make contact with the British consulate in Lyons.他们设法与英国驻里昂领事馆取得了联系。Bantam Lyons raised his eyes suddenly and leered weakly.班塔姆·莱昂斯蓦地抬起眼睛,茫然地斜瞅着他.First of all, this study reviews past unified analyses of ...