货轮变速运动渡河的定点问题研究

Publisher: 国家哲学社会科学学术期刊数据库

E-ISSN: 1008-9020|22|12|22-24

ISSN: 1008-9020

Source: 甘肃高师学报, Vol.22, Iss.12, 2017-01, pp. : 22-24

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Abstract