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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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万方数据
2013-09-01
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2013-09-01
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2013-09-01
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2016-12-12
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维普“标准信息服务平台”
2018-12-29
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