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    ASTM 工程标准和数字图书馆数据库

    2021-09-16
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    DII

    2013-09-01
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    incoPat专利数据库

    2020-12-08
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    国外科技报告资源库

    2013-09-01
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    国家标准全文公开系统

    2013-09-01
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    国家科技报告服务系统

    2016-12-12
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    维普“标准信息服务平台”

    2018-12-29
  • This Week（ 2022.05.16-05.22）Closing music：

    Song name

    Rachmaninoff Vocalise, Op.34, No.14

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