Calcination of petroleum coke can yield almost pure carbon or artificial graphite suitable for production of electrodes, motor brushes, dry cells, etc.
石油焦的煅烧可产出几乎纯的碳或人造石墨，适于生产电极、电机刷和干电池等。
2
Rod pumping is a main artificial lift oil production method in petroleum industry.
有杆泵采油是石油工业传统而占主导地位的人工举升采油方式。
3
Article 2 the fuel gas referred to in these Regulations means the gas fuel such as artificial coal gas, natural gas, and liquefied petroleum gas hereinafter called LPG.