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航空安全
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航空安全
通过持续的危险源识别和风险管理,将与航空器运行直接相关的航空活动引发的人员伤亡或财产损失风险降低并保持在可接受或以下的水平的一种状态。
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ancient irrigation area in Jingshui River basin
ancient irrigation area in Ningxia
ancient irrigation area in Qinhe River basin
ancient irrigation area in Xinjiang
ancient irrigation area in Zhanghe River basin
ancient jade drilling tools and techniques
ancient Japanese architecture
ancient Japanese mirror
ancient Korean architecture
Ancient Lagerstroemia in Liangshan Temple, Guangyuan City
ancient land use
ancient library
ancient lifting machine
ancient literature from Dunhuang
Ancient Longzhong in Xiangyang
ancient lotus pond garden
Ancient Lotus Pond in Baoding
Ancient Macedonia
ancient magnolia in Dajue Temple
ancient map
Ancient maps unearthed from a tomb of the Han Dynasty
ancient maps unearthed from a tomb of the Qin Dynasty
ancient mathematics
Ancient Melody of Spring Sunlight
Ancient Mesopotamian Culture
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