Special equipment manufacturing; special equipment design; special equipment installation, modification, and repair; special equipment inspection and testing; construction engineering design; construction engineering construction; specialized construction operations; construction engineering quality inspection; building demolition operations (excluding blasting operations); road cargo transportation (excluding dangerous goods). General items: special equipment sales; technology import and export; goods import and export; mechanical parts and components processing; mechanical parts and components sales; metal structure manufacturing; metal structure sales; productive scrap metal recycling; renewable resource recycling (excluding productive scrap metal); loading, unloading, and handling; non-residential real estate leasing; mechanical equipment research and development; mechanical equipment sales; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; conference and exhibition services; earthwork construction; landscaping construction; engineering management services; motor and its control system research and development; electrical signal equipment device manufacturing; electrical signal equipment device sales; mechanical and electrical equipment manufacturing; electrical equipment repair; canopy sales; internet sales (excluding products requiring sales permits); smart home consumer equipment sales; material handling equipment sales; general mechanical equipment installation services; software development; domestic cargo transportation agency; land international cargo transportation agency; maritime international cargo transportation agency; air international cargo transportation agency; road cargo transportation for ordinary freight vehicles with a total mass of 4.5 tons or less (excluding network freight and dangerous goods).