Construction company, trading company, and what other companies

1, manufacturing company: engaged in the production and manufacture of products, including factories and production lines.

2, agricultural companies: engaged in the cultivation, processing and marketing of agricultural products.

3, energy companies: engaged in the production, distribution and supply of energy, including electricity, oil and gas.

4, media companies: involved in media, advertising and publishing, including newspapers, television, radio, magazines and so on.

5, technology companies: mainly engaged in research and development, production and sales in the field of science and technology, involving computers, electronics, software and so on.

6, health care companies: engaged in medical services, drug manufacturing, medical equipment sales.