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第三次科技革命（20世纪四五十年代-21世纪之交） 1.标志：信息技术 2.代表：电子计算机（1946年第一台） 3.最早从美国开始 4.空间技术的发展：人造地球卫星、载人宇宙飞船、航天飞机 5.地球村进入信息时代 (jan 1, 1945 – jan 1, 2000)

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jan 1, 1945
jan 1, 2000
~ 55 years
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