Technology development, technical services, technical consulting; provision of services for oil and gas extraction; enterprise management services; economic and trade consulting; import and export of goods; technology import and export; import and export agents; sales of petroleum equipment and accessories, machinery and equipment, computer software and hardware, fuel oil No. 7, lubricants, asphalt, metal ores, non-metallic ores, feed and daily necessities; sales of food and chemical products. (Enterprises independently select business projects and carry out business activities in accordance with the law; sell food, chemical products, and projects subject to approval according to law, carry out business activities in accordance with the approved content after approval by the relevant departments; they are not allowed to engage in business activities prohibited or restricted by the city's industrial policy.)