All kinds of engineering construction activities (for projects that are subject to approval according to law, business activities can only be carried out after being approved by relevant departments, and specific business projects shall be subject to the approval result) General items: Machinery and equipment sales; General mechanical equipment installation services; General equipment repair; Special equipment repair; Sales of special equipment for environmental protection; Instrumentation sales; Building materials sales; Electrical equipment sales; Import and export of goods; Technology import and export; Retail of daily necessities; Sales of labor protection articles (except for the projects that must be approved according to law, independently carry out business activities according to law by business license). All kinds of engineering construction activities (for projects that are subject to approval according to law, business activities can only be carried out after being approved by relevant departments, and specific business projects shall be subject to the approval result) General items: Machinery and equipment sales; General mechanical equipment installation services; General equipment repair; Special equipment repair; Sales of special equipment for environmental protection; Instrumentation sales; Building materials sales; Electrical equipment sales; Import and export of goods; Technology import and export; Retail of daily necessities; Sales of labor protection articles (except for the projects that must be approved according to law, independently carry out business activities according to law by business license).