久久久久国产精品免费A片,中文字幕乱码熟妇五十中出,国精产品一二三区传媒公司,辽宁人妻Chinese

Cold chain logistics generally refers to a systematic project in which refrigerated and frozen food products are always in a specified low-temperature environment throughout the production, storage, transportation, distribution, and various stages to the consumer end, in order to ensure food quality and reduce food loss. It was established with the progress of science and technology and the development of refrigeration technology. It is a low-temperature logistics and storage process based on refrigeration technology and using refrigeration technology as a means. The rapid development of China's agricultural cold chain logistics industry requires the country to formulate and implement scientific and effective macro policies.