Photo taken on Jan. 30, 2015 shows an unmanned police helicopter flying in the air in a joint emergency drill for highway traffic accident for the first time in Weifang City, east China's Shandong Province. (Xinhua/Sun Shubao)
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Photo taken on Jan. 30, 2015 shows an unmanned police helicopter flying in the air in a joint emergency drill for highway traffic accident for the first time in Weifang City, east China's Shandong Province. (Xinhua/Sun Shubao) |