General Projects: Refining and chemical production equipment manufacturing; Environmental protection equipment manufacturing; Environmental protection equipment sales; Equipment manufacturing (excluding equipment manufacturing requiring permits); Coal-fired flue gas desulfurization and denitrification equipment manufacturing; Coal-fired flue gas desulfurization and denitrification equipment sales; Mechanical and electrical equipment manufacturing; Electrical equipment sales; Power facility materials manufacturing; Power facility materials sales; Pump and vacuum equipment manufacturing; Pump and vacuum equipment sales; General equipment manufacturing (excluding special equipment manufacturing); Special equipment sales; Metal materials manufacturing; Mechanical equipment research and development; Electrical mechanical equipment sales; Mechanical equipment sales; General mechanical equipment installation services; Equipment repair; Metal product sales; Metal product development; Valve and plug sales; High-performance non-ferrous metal and alloy materials sales; Metal