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http://reply.papertrans.cn/93/9228/922757/922757_19.png
dagger
发表于 2025-3-25 02:22:59
H.J.L. Witte,A.J. Van Gelderirical observations, inferred its properties, and part to his colleague Cobb, a mathematician, who suggested the mathematical form. Douglas had drawn a graph of the capital stock, total labour force and GNP for the US manufacturing industries for the period 1899–1922. He discovered that the differen