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Since the Air Force bought its first F-100, every fighter that has entered the inventory has had the ability to fly faster than the speed of sound ["The Sixth Generation Fighter,"October, p. 38]. It has been an article of faith that supersonic capability is absolutely required in any new aircraft.The Air Force has even had a few bombers with supersonic capability. Yet, as far as I know, no USAF combat aircraft has needed to employ supersonic flight in order to successfully accomplish its mission. Even when supersonic aircraft have gone head-to-head, the fight has taken place at subsonic speeds.

机译：自从空军购买了第一架F-100以来，进入库存的每架战斗机都有能力以比音速更快的速度飞行。[“第六代战斗机”，第10 38]。人们一直相信，任何新飞机都绝对需要超音速能力，甚至空军也有几架具有超音速能力的轰炸机。但是据我所知，美国空军没有战斗机需要使用超音速飞行来成功完成其任务。即使当超音速飞机正面交锋时，战斗仍以亚音速进行。

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《Air Force and space digest》 |2009年第12期|4-7|共4页
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6. Letter-Sound Knowledge: Exploring Gender Differences in Children When They Start School Regarding Knowledge of Large Letters Small Letters Sound Large Letters and Sound Small Letters [O] . Hermundur Sigmundsson, Adrian D. Eriksen, Greta Storm Ofteland, -1

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