Various engineering construction activities. General items: general equipment manufacturing (excluding special equipment manufacturing); communication equipment manufacturing; mechanical and electrical equipment manufacturing; mold manufacturing; safety and fire-fighting metal product manufacturing; door and window manufacturing and processing; security equipment manufacturing; civil air defense engineering protective equipment manufacturing; hardware product wholesale; auto parts retail; auto parts wholesale Development; retail of motorcycles and spare parts; wholesale of motorcycles and spare parts; sales of first-class medical devices; socioeconomic consulting services; professional design services; technical services, technology development, technical consultation, technology exchange, technology transfer, and technology promotion; professional cleaning, cleaning, and disinfection services; import and export of goods; import and export of technology.