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  3. Computer data bases and electronic mail systems have been around since the late 1970s

Computer data bases and electronic mail systems have been around since the late 1970s

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问题 Computer data bases and electronic mail systems have been around since the late 1970s
选项
答案20世纪70年代末，计算机数据基础和电子邮递系统已广泛使用。
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