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Chinese Science and Technology Minister Wan Gang, also vice-chairperson of National Committee of the Chinese People's Political Consultative Conference (CPPCC) and chairman of National Committee of China Association for Science and Technology (CAST), addresses the opening ceremony of the 18th annual meeting of the CAST in Xi'an, capital city of northwest China's Shaanxi Province, Sept. 24, 2016. (Xinhua/Li Yibo)
