西西人体大胆牲交pp6777_日中文字幕精品在线_最近2018免费中文字幕1页_白嫩的sex少妇hd高清_无卡无码高清中文字幕_2019最新福利天堂视频92视频_日韩精品熟妇人妻_俄罗斯videodesxo极品_果冻传媒精选麻豆九二_AV日产影片在线播放

Unmanned aircraft, abbreviated as "UAV" and "UAV" in English, is an unmanned aircraft operated by radio remote control equipment and self-contained program control device, or operated completely or intermittently by on-board computer[ 1] Compared with manned aircraft, UAVs are often more suitable for tasks that are too "stupid, dirty or dangerous". According to the application field, UAV can be divided into military and civil. In military terms, UAVs are divided into reconnaissance aircraft and target aircraft. For civil use, UAV + industrial application is the real demand of UAV; At present, the application in the fields of aerial photography, agriculture, plant protection, micro selfie, express transportation, disaster rescue, observation of wild animals, monitoring of infectious diseases, surveying and mapping, news reporting, power inspection, disaster relief, film and television shooting, manufacturing romance and so on has greatly expanded the use of UAV itself. Developed countries are also actively expanding the industrial application and development of UAV technology. In September 2018, the 62nd meeting of the Harmonized System Committee (HSC) of the World Customs Organization decided to classify UAVs as "flying cameras".