A worker is busy at a plant of Yihai Kerry (Harbin) Oils, Grains &Foodstuffs Industries Co., Ltd. in Harbin, northeast China's Heilongjiang Province, Feb. 20, 2020. Some oils and grains enterprises in Heilongjiang have resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) recently. (Xinhua/Wang Song)

A worker is busy at a plant of Yihai Kerry (Harbin) Oils, Grains &Foodstuffs Industries Co., Ltd. in Harbin, northeast China's Heilongjiang Province, Feb. 20, 2020. Some oils and grains enterprises in Heilongjiang have resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) recently. (Xinhua/Wang Song)

A worker is busy at a plant of Yihai Kerry (Harbin) Oils, Grains &Foodstuffs Industries Co., Ltd. in Harbin, northeast China's Heilongjiang Province, Feb. 20, 2020. Some oils and grains enterprises in Heilongjiang have resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) recently. (Xinhua/Wang Song)

Workers are busy at a plant of Sany Heavy Industry in Changsha, central China's Hunan Province, Feb. 20, 2020. Sany Heavy Industry has resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) since Feb. 18. (Xinhua/Chen Zeguo)

A welding robot is seen at a plant of Sany Heavy Industry in Changsha, central China's Hunan Province, Feb. 20, 2020. Sany Heavy Industry has resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) since Feb. 18. (Xinhua/Chen Zeguo)

A worker disinfects his hands before entering the dinning hall of Sany Heavy Industry in Changsha, central China's Hunan Province, Feb. 20, 2020. Sany Heavy Industry has resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) since Feb. 18. (Xinhua/Chen Zeguo)

A worker debugs a camera at a plant of Sany Heavy Industry in Changsha, central China's Hunan Province, Feb. 20, 2020. Sany Heavy Industry has resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) since Feb. 18. (Xinhua/Chen Zeguo)

A worker debugs a robot at a plant of Sany Heavy Industry in Changsha, central China's Hunan Province, Feb. 20, 2020. Sany Heavy Industry has resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) since Feb. 18. (Xinhua/Chen Zeguo)

Workers are busy at a plant of Sany Heavy Industry in Changsha, central China's Hunan Province, Feb. 20, 2020. Sany Heavy Industry has resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) since Feb. 18. (Xinhua/Chen Zeguo)

Workers disinfect their hands before having lunch at a plant of Sany Heavy Industry in Changsha, central China's Hunan Province, Feb. 20, 2020. Sany Heavy Industry has resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) since Feb. 18. (Xinhua/Chen Zeguo)

Photo shows robots working at a plant of Sany Heavy Industry in Changsha, central China's Hunan Province, Feb. 20, 2020. Sany Heavy Industry has resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) since Feb. 18. (Xinhua/Chen Zeguo)

A worker receives body temperature check at the entrance of Sany Heavy Industry in Changsha, central China's Hunan Province, Feb. 20, 2020. Sany Heavy Industry has resumed production in an orderly manner under strict measures taken to prevent and control the novel coronavirus disease (COVID-19) since Feb. 18. (Xinhua/Chen Zeguo)