Import and export of goods; import and export of technology; processing of non-metallic waste and debris; mineral washing and processing; general items: sales of cement products; sales of non-metallic minerals and products; sales of chemical products (excluding licensed chemical products); technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; production and sales of concrete admixtures, waterproof materials; sales: hardware, electricity, mechanical and electrical equipment, building materials (excluding hazardous chemicals), steel; general freight.