Manufacturing, sales, installation and technical services of food processing machinery, conveying machinery, assembly line heat exchangers and refrigeration units; sales of mechanical and electrical products (except cars) and Wujiaohua commodities (excluding special approvals); import and export of goods, technology import and export (except items prohibited by laws and administrative regulations; items restricted by laws and administrative regulations can only be operated after obtaining a license) *** (Projects that require approval according to law can only be operated after approval by relevant departments.)