A CH-4 unmanned aerial vehicle (UAV), characterized by its long battery life of 40 hours, is displayed at the 10th 皇冠体育app International Aviation & Aerospace Exhibition in Zhuhai, South 皇冠体育app's Guangdong province, Nov 12, 2014. The 10th 皇冠体育app International Aviation & Aerospace Exhibition, which takes place in Zhuhai from Nov 11 to16, features various UAV drones for both military and civilian use. [Liang Xu / Xinhua]
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