using coal instead of oil
cinnamon oil cassia oil
Essential oil Volatile oil
Extract Oil of Lubricating Oil
oil bearing sewage in oil field8
Oil Extractor in Oil Field
oil shale and oil shale residue
ultraheavy oil as fuel oil
CO production instead of coal vaporization
cotton stalks instead of wood
Emergency Gas Sources Instead of Natural Gas
entire automatic instead of wash filter
Instead Building System
Instead of hard chroming
long-hole instead of roadway