General projects: fan and fan manufacturing; fan and fan sales; pump and vacuum equipment manufacturing; pump and vacuum equipment sales; gas compression machinery manufacturing; gas compression machinery sales; mechanical equipment research and development; mechanical equipment sales; mining machinery manufacturing; mining machinery sales; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; nuclear power equipment complete sets and engineering technology research and development; water pollution control; intelligent water system development; water environment pollution prevention and control services; research and development of unconventional water source utilization technology; resource recycling