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美国内华达州，红旗 13-2 联合空战演习，从内利斯空军基地起飞的路易斯安那州巴克斯代尔空军基地第20轰炸机中队的 B-52H“同温层堡垒”轰炸机在演习空域飞行。其8台涡喷发动机单台推力17000磅。(A B-52H Stratofortress assigned to the 20th Bomb Squadron, Barksdale Air Force Base, La., flies during a Red Flag exercise at Nellis Air Force Base, Nev., Jan. 31, 2013. The B-52 has eight turbojet engines, each capable of producing 17,000 pounds of thrust, with a top speed of 650 miles per hour. Now entering its sixth decade of service, it continues to be an integral element of the Air Force bomber fleet.)

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