因“变”而“变”,“变”中有“定”——闭合电路中△U/△I的变化规律探讨

Publisher: 国家哲学社会科学学术期刊数据库

E-ISSN: 1002-042x|volume|6|67-68

ISSN: 1002-042x

Source: 物理教师, Vol.volume, Iss.6, 2017-01, pp. : 67-68

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Abstract