Supermarket employees deliver daily necessities to residents under close-off management in Bayan County of Harbin, northeast China's Heilongjiang Province, Sept. 27, 2021. Local authorities have prioritized delivery services to ensure the supply of necessities for residents under close-off management. The pricing of commodities remains stable in the county.Photo:Xinhua

Photo taken on Sept. 27, 2021 shows packed flour at a supermarket in Bayan County of Harbin, northeast China's Heilongjiang Province.Photo:Xinhua

Supermarket employees prepare meat ordered online by residents under close-off management in Bayan County of Harbin, northeast China's Heilongjiang Province, Sept. 27, 2021.Photo:Xinhua

A supermarket employee prepares vegetables ordered online by residents under close-off management in Bayan County of Harbin, northeast China's Heilongjiang Province, Sept. 27, 2021. Photo:Xinhua

Supermarket employees prepare vegetables ordered online by residents under close-off management in Bayan County of Harbin, northeast China's Heilongjiang Province, Sept. 27, 2021.Photo:Xinhua

A supermarket employee prepares vegetables ordered online by residents under close-off management in Bayan County of Harbin, northeast China's Heilongjiang Province, Sept. 27, 2021.Photo:Xinhua

Daily necessities are ready to be delivered to residents under close-off management at a supermarket in Bayan County of Harbin, northeast China's Heilongjiang Province, Sept. 27, 2021.Photo:Xinhua

A supermarket employee selects vegetables ordered online by residents under close-off management in Bayan County of Harbin, northeast China's Heilongjiang Province, Sept. 27, 2021.Photo:Xinhua