(190225) -- BEIJING, Feb. 25, 2019 (Xinhua) -- A technician checks the content of sulfur dioxide in food during an activity in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, March 15, 2017, the International Consumer Rights Day. China has unveiled a guideline to enhance the accountability system of local governments to strengthen supervision over food safety. Food safety will be included in the performance assessment of the Party and government leading officials, according to the guideline released by the Central Committee of the Communist Party of China (CPC) and the S - Stock Image