Petrochemical industry is the basic industry and pillar industry of national economy. Its development speed and scale have a direct impact on all links of social economy. The chemical industry has the characteristics of various categories, complex processes, diverse products, and many kinds, large quantities and high toxicity of pollutants discharged in production.

Chemical industry plays an important role in the national economy of many countries and is the basic industry and pillar industry of many countries. The development speed and scale of chemical industry have a direct impact on all sectors of social economy. The annual output value of world chemical products has exceeded US $1.5 trillion.

The power station industry is a factory that converts all kinds of primary energy contained in nature into electrical energy (secondary energy). At the end of the 19th century, with the growth of power demand, people began to put forward the idea of establishing a power production center.

医药行业是我国国民经济的重要组成部分，是传统产业和现代产业相结合，一、二、三产业为一体的产业。其主要门类包括：化学原料药及制剂、中药材、中药饮片、中成药、抗生素、生物制品。

Metallurgical industry refers to the industrial sector that mines, selects and sinters metal ores and smelts and processes them into metal materials.

Natural gas is contained in underground porous rock layers, including oil field gas, gas field gas, coalbed gas, mud volcanic gas and biogenic gas, and a small amount of it comes from coal seams. It is a high-quality fuel and chemical raw material.