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A worker is seen at an explosion-proof electromechanical equipment enterprise in Luannan County, north China's Hebei Province, Dec. 18, 2018. (Xinhua/Yang Shiyao)
A worker is seen at an explosion-proof electromechanical equipment enterprise in Luannan County, north China's Hebei Province, Dec. 18, 2018. (Xinhua/Yang Shiyao)