Licensed business items: Construction labor subcontracting; Construction project construction; Import and export of goods; Technology import and export; Import and export agent( Licensed business items are operated with licenses) General business items: Steel rolling processing; Metal product sales; Sales of high-quality special steel materials; Sales of metal parts for construction; Sales of agricultural, forestry, animal husbandry and fishery machinery parts; Agricultural machinery sales; Installation of specialized machinery for agriculture, forestry, animal husbandry, sideline production and fishery、 repair; Manufacturing of specialized machinery for agriculture, forestry, animal husbandry, sideline production and fishery; Agricultural film sales; Insulation material sales; Hardware product manufacturing; Hardware wholesale; Advertising; Blockchain technology-related software and services; Corporate member points management service; Business agency services; Internet of Things Technology Services; Internet of Things technology research and development; Industrial Internet Data Services; IoT application services; Software Development; Software Sales; Technical Services、 Technology Development、 Technical Consulting、 Technical Exchange、 Technology Transfer、 Technology Promotion; Bidding agency services; New energy prime mover equipment manufacturing; New energy vehicle sales; New energy prime mover equipment sales;Earthwork construction; Engineering Management Services; Internet sales( Except for the sale of goods that require a license); Non-ferrous metal alloy sales; Metal material sales; Sales of coal and its products; Building materials sales; Hardware product retail; Machinery and equipment sales; Sales of Class I medical devices; Sales of agricultural and sideline products; Wholesale of edible agricultural products; Edible agricultural product retail; Aquatic Products Wholesale; Aquatic product retail; cosmetics retail; Sales of needlework textiles; Daily necessities sales; Sales of arts and crafts and ceremonial supplies( Except ivory and its products); Sporting goods and equipment retail; Home appliance sales; Jewelry Retail; Retail of kitchenware, sanitary ware and daily necessities; Sales of sanitary products and disposable medical supplies; Disinfectant sales( No hazardous chemicals); Retail of protective equipment for medical staff; Rubber product sales;Chemical product sales( Does not contain permitted chemical products); Sales of special labor protection products; Sales of labor protection products; Electronics sales; Communications equipment sales; Graphic design and production; Digital Advertising Design、 acting; Translation services; Consulting and planning services; Industrial Design Services; Professional design services; Marketing Planning; Corporate image planning; Organize cultural and artistic exchange activities; Project planning and public relations services;5G Communication technology services; Information technology consulting services; Digital Technology Services; Artificial intelligence application software development; Software outsourcing services; Artificial intelligence basic software development; Digital cultural and creative software development; Network and information security software development( General business items within the business scope are independently carried out in accordance with the law, Through the National Enterprise Credit Information Publicity System( Hainan) Public disclosure to the public)