Methane and propane are alkanes.甲烷和丙烷是烷烃。Its main components include propane, butane and butylene.主要成份是丙烷 、 丁烷、丁烯等.a propane gas cylinder丙烷气钢瓶Fuel propane is scented with mercaptan odourants for leak detection.燃料丙烷通常添加硫醇...