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Photo taken on March 21, 2016 shows the national crude oil reserve base at the Nangang Industrial Zone in Tianjin, north China. China launched trading of crude oil futures contracts at the Shanghai International Energy Exchange on Monday in its steady move of opening up the financial sector. It was the first futures contracts listed on China's mainland to overseas investors, putting domestic and foreign investors on an equal footing. (Xinhua/Yue Yuewei)