Glass fiber and product manufacturing; Glass fiber and product sales; High-performance fiber and composite material sales; Anti-corrosion material sales; Metal structure sales; Environmental protection special equipment sales; Environmental monitoring special instrument and meter sales; Fire-fighting technical services; Safety consulting services; Safety technical prevention system design and construction services; Computer system services; Fire-fighting equipment sales; Building materials sales; Metal material sales; Electrical equipment sales; Glass fiber reinforced plastic product manufacturing; Glass fiber reinforced plastic product sales; Environmental sanitation public facility installation services; Gas, liquid separation and purification equipment sales; Traffic and public management signage sales; Artificial board sales; Plastic product sales; Refrigeration and air conditioning equipment sales; Rubber product sales; Non-ferrous metal alloy sales; New metal functional material sales; Metal product sales; Railway transport equipment sales; Railway locomotive and vehicle accessory sales; Environmental protection consulting services; Coal-fired flue gas desulfurization and denitrification equipment sales; Water quality pollutant monitoring and detection instrument and meter sales; Machinery and equipment sales; Machinery and equipment leasing; Electronic and mechanical equipment maintenance (excluding special equipment); Machinery and equipment research and development; General mechanical equipment installation services; Goods import and export; Technology import and export; Security equipment sales. Permitted items: Construction engineering construction; Residential interior decoration.