青云翻译

Catalytic cracking as well as atmospheric and vacuum distillation is the most important refinery processing units.

FCC and atmospheric and is the most important kind of refinery processing unit.

The catalytic cracking as well as often the reduced pressure is a refinery most important kind of processing equipment.

Catalytic cracking, as well as refinery is often the most important pressure of such a unit.

FCC and atmospheric and is the most important kind of refinery processing unit.