What are the six foundations of industry?

What are the six foundations of industry? Metallurgy, coal, petroleum, electricity, chemistry and machinery. Industrial base refers to energy (including electricity) industry and basic raw materials (including important mineral resources, steel, petrochemical materials, etc.). ) industry. The six bases also refer to the six basic industrial sectors of metallurgy, coal, petroleum, electric power, chemistry and machinery, and are the general names of industrial sectors that provide basic means of production for the national economy.