Food additive production; Mobile pressure vessel/gas cylinder filling; Special equipment inspection and testing; Hazardous chemical operation; Road dangerous goods transportation; Construction engineering design; Inspection and testing services; Special equipment installation, modification, and repair; Construction engineering construction. General items: Basic chemical raw material manufacturing (excluding hazardous chemicals and other licensed chemical manufacturing); Fire protection technical services; Electrical instrument sales; Special equipment sales; Industrial automatic control system device manufacturing; Industrial automatic control system device sales; Special equipment leasing; Material handling equipment manufacturing; Auto parts and accessories manufacturing; General equipment repair; Professional cleaning, washing, and disinfection services; Specialized chemical product sales (excluding hazardous chemicals); General cargo warehousing services (excluding hazardous chemicals and other items requiring licensing approval); Road freight transportation for vehicles with a total mass of 4.5 tons and below (excluding online freight and dangerous goods); Labor services (excluding labor dispatch); Loading and unloading; Non-residential real estate leasing.