Environmental technology promotion services; research, development, and sales of environmental protection equipment, thermal equipment, pressure vessels; sales, installation, and maintenance of boiler and auxiliary machinery equipment, water treatment equipment, dust collectors, desulfurization and denitrification equipment, steam generators, energy-saving equipment, and automatic control equipment; sales of electrical equipment, control cabinets, instruments, and meters, and chemical products (excluding hazardous chemicals); design and construction of environmental protection projects and civil engineering projects