Licensed Projects: Construction project construction, Installation, modification and repair of special equipment( Projects that require approval according to law, Business activities can only be carried out within the validity period of the license after approval by relevant departments,The specific business items and license period are subject to the approval documents or licenses of relevant departments.) General Projects: Construction machinery manufacturing, Machinery and equipment rental, Machinery and equipment sales, Auto parts and accessories manufacturing,Agricultural machinery manufacturing, Agricultural machinery services, General equipment manufacturing( Excluding special equipment manufacturing), Construction machinery sales, Construction machinery and equipment rental, Manufacturing of special equipment for environmental protection, Sales of special equipment for environmental protection, Casting machinery manufacturing, Casting machinery sales, Mechanical parts、 Parts processing, Mechanical parts、 Parts Sales, Mining machinery manufacturing, Mining machinery sales, General parts manufacturing, Metal material sales,Metal material manufacturing, Bearing sales, Steel rolling processing, Metal structure sales, Sales of steel bars for construction, Manufacturing of metal wire ropes and their products, Sales of metal wire ropes and their products, Rubber product sales, Sales of engineering plastics and synthetic resins, General mechanical equipment installation services, Wastewater treatment and recycling, Internet sales( Except for the sale of goods that require a license)( Except for projects that require approval according to law, Carry out business activities independently in accordance with the law with a business license)