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