2. Refined oil is a qualified oil product that can be supplied to the outside world after being refined from crude oil and processed in the enterprise after reaching a certain quality standard.
3. Crude oil is a viscous substance directly mined from underground without any treatment. After the crude oil arrives at the refinery, it is refined and its different components are separated by fractionation, thus obtaining gasoline, diesel oil, kerosene, paraffin asphalt and other products. Traditionally, gasoline, diesel oil, kerosene and fuel oil are called refined oil.