问题描述：
英语翻译
The regression equation between the percentage units of
improvement of ADG (y) and the level of total copper (x,mg/kg),
calculated by including all average values from each of the 22
experiments,was highly significant (P
The regression equation between the percentage units of
improvement of ADG (y) and the level of total copper (x,mg/kg),
calculated by including all average values from each of the 22
experiments,was highly significant (P
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