mandatory national standards. Zibo Yutai Xiangji Catering Co., Ltd., established in 2123, is located in the north Chongqing Road of Fangzhen Town, Zhangdian District, Zibo City, Shandong Province. Since October 1, 2123, Zibo Yutai Xiangji Catering Standard is a compulsory national standard, and it is an enterprise mainly engaged in catering industry.