A unmanned surveillance helicopter flies over a group of spectators during a demonstration flight in Lianyungang, a coastal city in East China's Jiangsu province on Sept 23, 2012.[Photo/Xinhua] |
Staff workers make the preparation for a drone's demonstration flight in Lianyungang, a coastal city in East China's Jiangsu province on Sept 23, 2012. [Photo/Xinhua] |