heavy fraction oil

Heavy Oil Fraction

oil fraction

Modified naphthalene oil

Naphthalene 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 of oil shale

oil shale and oil shale residue

ultraheavy oil as fuel oil

11S and 7S fraction

2-periodic continued fraction

a fraction of

absorbed fraction

absorbing fraction

absorption fraction