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How many industry classifications are there under the column of industry economy in the education edition of National Research Network?
There are 2 1 industry classifications.

Information industry, petrochemical industry, pharmaceutical industry, health industry, steel industry, nonferrous metals, transportation, machinery industry, automobile industry, light industry, science and technology industry, tourism industry, energy industry, agriculture, forestry, animal husbandry and fishery industry, textile industry, building materials industry, real estate industry, construction industry, wholesale and retail industry, accommodation and catering industry, and cultural industry.