General items: Import and export of goods; Technology import and export; Manufacture of special equipment for environmental protection; Sales of special equipment for environmental protection; Refrigeration, air conditioning equipment manufacturing; Sales of refrigeration and air-conditioning equipment; Manufacture of gas and liquid separation and purification equipment; Gas, liquid separation and purification equipment sales; Dust removal technology and equipment manufacturing; Synthetic fiber manufacturing; Spinning process; Synthetic fiber sales; High performance fiber and composite material manufacturing; Sales of high performance fiber and composite materials; Machine parts, parts processing; Machinery and equipment sales; Motor and its control system development; Electrical equipment sales; General mechanical equipment installation services; Domestic trade agency; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology dissemination; General equipment manufacturing (excluding special equipment manufacturing) (in addition to the licensed business, can independently operate according to laws and regulations are not prohibited or restricted projects) Licensed projects: Road cargo transport (excluding dangerous goods) (according to the law to be approved by the relevant departments before the approval of business activities, specific business projects to the relevant departments approval documents or licenses shall be subject to)