The roots of radio-frequency identification technology stretch at least as far back as World War II, when transponders helped distinguish between Axis and Allied aircraft. 無(wú)線(xiàn)頻率識別技術(shù)的最早運用可以追溯到第二次世界大戰，那時(shí)無(wú)線(xiàn)電發(fā)射機應答器幫助人們分辨軸心國和同盟國的戰機。
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