火药和指南针在郑和下西洋中的使用
Publisher: 国家哲学社会科学学术期刊数据库
E-ISSN: 1674-8646|6|13|84-84
ISSN: 1674-8646
Source: 黑龙江科学, Vol.6, Iss.13, 2015-01, pp. : 84-84
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Abstract