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17 Television Day: Computers TV Commentary: ... the astronauts are returning to earth at exactly 5.24. Splash-down will be in the Pacific, 427 miles west of Hawaii. You have often heard announcements like this on television. Scientists can tell us ex

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Unit 14 Information Systems Today 227 今天的信息系统信息技术对于人类的生活是重要的和不可或缺的。信息的传送、记录或存储和处理是信息的三种基本步骤。科技不断发展，对信息技术的掌握可以使人类的进化更加迅速 Information technology is important and indispen

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