A worker works at a factory of a plastic products company in Ning'an City, northeast China's Heilongjiang Province, May 21, 2020. Up to now, all the enterprises above designated size in the city have resumed production.Photo:Xinhua

Workers work at a factory of a furniture company in Ning'an City, northeast China's Heilongjiang Province, May 21, 2020. Up to now, all the enterprises above designated size in the city have resumed production.Photo:Xinhua

A worker works at a factory of a plastic products company in Ning'an City, northeast China's Heilongjiang Province, May 21, 2020. Up to now, all the enterprises above designated size in the city have resumed production.Photo:Xinhua

A worker works at a factory of a plastic products company in Ning'an City, northeast China's Heilongjiang Province, May 21, 2020. Up to now, all the enterprises above designated size in the city have resumed production. Photo:Xinhua

Workers work at a factory of a plastic products company in Ning'an City, northeast China's Heilongjiang Province, May 21, 2020. Up to now, all the enterprises above designated size in the city have resumed production.Photo:Xinhua

A worker works at a factory of a plastic products company in Ning'an City, northeast China's Heilongjiang Province, May 21, 2020. Up to now, all the enterprises above designated size in the city have resumed production.Photo:Xinhua