从主题词词频变化看我国科技政策演变

Publisher: 国家哲学社会科学学术期刊数据库

E-ISSN: 2095-915x|2|4|14-19

ISSN: 2095-915x

Source: 情报工程, Vol.2, Iss.4, 2016-01, pp. : 14-19

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Abstract