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Workers monitor the situation of production in a control room of cold rolling mill at HBIS Group Serbia in Smederevo, Serbia, Feb. 21, 2017. (Xinhua/Wang Huijuan)
Workers monitor the situation of production in a control room of cold rolling mill at HBIS Group Serbia in Smederevo, Serbia, Feb. 21, 2017. (Xinhua/Wang Huijuan)