General business projects: (Excluding projects requiring special approval under national laws and regulations; special approval is required after obtaining approval documents or administrative license certificates issued by relevant departments. The specific operating project period is subject to the approval documents and administrative license certificates issued by the relevant departments): mechanical and electrical equipment, agricultural and animal husbandry machinery, agricultural and sideline product processing machinery, forestry and fruit industry machinery, light industry machinery, energy-saving and environmental protection machinery, electrical and automation equipment, engineering design, trial production, sales and after-sales service of non-ferrous metal alloys, molding machinery, steel casting machinery, special metallurgical equipment, metallurgical equipment Utensils Manufacture of other special equipment for non-metal processing; metal surface treatment and heat treatment processing; technology promotion, other technological services; import and export business; sales of instruments, electrical components, hardware exchanges, raw and auxiliary materials for casting, mechanical product parts and various types of mechanical and electrical products; housing leasing.