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马车轻快地奔驰在乡间大路上，将一个个飘着炊烟的村落甩在身后。再听说清南村的村民竟然嚎哭说再不让孩子读书入仕，永平帝这才动容。　　一个微妙的转折发生在银河帝国建国后的12020年。哈里·谢顿，这个刚满32岁的年轻数学家，开创了“心理史学”，这门学科能用数学公式准确推演全人类的未来——“预言”从此成为一门可以信任的科学，人类由此可以看见未来...Aviation units mainly carry out tactical training, combined with combat missions, focusing on combat technology and tactical application training to improve their ability to carry out missions under complex conditions. Every year, tactical, technical, theoretical and physical assessment is organized, and flight grade assessment is carried out, and pilots of Grade I, II and III are respectively assigned. The purpose of aviation unit training is to enable each pilot to master the combat technology of advanced aircraft and be able to undertake combat missions.In the event binding, all event processing is finally put on one object.BOT is the abbreviation of Build-Operate-Transfer, which is usually literally translated as "Build-Operate-Transfer". BOT is essentially a way to invest, build and operate infrastructure. On the premise of reaching an agreement between the government and private institutions, the government issues a concession to private institutions to allow them to raise funds to build a certain infrastructure and manage and operate the facility and its corresponding products and services within a certain period of time. The Government may limit the quantity and price of public goods or services provided by the Agency, but ensure that private capital has the opportunity to make profits. The risks in the whole process are shared by the Government and private institutions. When the concession period ends, the private organization will transfer the facility to the government department as agreed, and the facility will be operated and managed by the government designated department. Therefore, the word BOT is paraphrased as "infrastructure concession.