Sales of screen materials, metal products, hardware and electrical appliances (excluding electric bicycles), glass products, plastic products, rubber products, steel materials, mechanical equipment, building materials. Goods import and export: Technology development, technology transfer, technical services, technical consultation; Software development; Economic and trade consulting; Conference services. (The enterprise may, in accordance with the law, independently choose its business projects and carry out activities: Projects that require approval must be approved by relevant departments and be carried out in accordance with the approved contents; Activities that are prohibited or restricted by the industrial policy of this area shall not be conducted. )