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美国空军一架 A-10C 攻击机在美国肯塔基州空中国民警卫队基地，准备参加第22届“路易斯维尔航空展”。(A U.S. Air Force A-10 Thundebolt sits on the ramp at the Kentucky Air National Guard in Louisville, Ky., April 20, 2012. The Kentucky Air National Guard Base will once again serve as the launching pad for military aircraft slated to appear in this weekend's 22-annual Thunder Over Louisville air show April 21.)