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2021-12-19
西汉孝文皇帝刘恒的霸陵在发掘过程中,出土了一件汉代的齿轮。该齿轮制作精细,锯齿分布均匀,极有穿越感。在手工业制造时代,生产一件跟现代齿轮极其相似的车马配件,非常罕见也充满神秘感。
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2021-07-14
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2021-04-11
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2021-03-24
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2021-02-05
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2020-10-15
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2020-10-10
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2020-09-13
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2020-04-27
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2020-03-27
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2019-12-25
几个月前,不少进出上海港的货轮都出现了GPS信号异常的情况。《麻省理工科技评论》杂志引述业内专家认为,此类异常疑为中国测试新型电子战武器造成,但也无法排除走私贩为逃避监管而发明了新技术。
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2019-11-24
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2019-11-14
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2019-11-02
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2019-10-07
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2019-09-24
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2019-05-16
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2019-05-03
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2019-02-02
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2018-02-03