Precision metal casting and mold manufacturing; manufacturing and repair of various pumps and supporting motors; three-wheel motorcycle parts manufacturing; wholesale, retail, purchase and sales of various materials and businesses; computer equipment maintenance, daily necessities repair, loading and unloading, freshwater aquaculture; electrical cabinets, transformer manufacturing, sales, repair and service; import and export of goods (unless otherwise provided by laws and administrative regulations); R&D, design, repair and service of motors and pumps; R&D, design, manufacturing of oil drilling equipment and gathering and transportation equipment. Repairs and services; road transportation of goods; contracting of technical service construction projects such as oil field water injection, dilution, repair, etc.; manufacturing of centrifugal water injection pumps (can be operated with permission from the special equipment safety supervision department); recycling of renewable resources; leasing of machinery and equipment; leasing of non-residential real estate; manufacturing of metal tools; sales of metal materials; sales of non-ferrous metal alloys; non-ferrous metal rolling processing (the above business scope involves industry licenses with licenses and must be operated within the validity period. If the state has special regulations, it shall be handled in accordance with the regulations)