选取海伦市1999～2001年数据进行计算，取平均值代表近年来该地区玉米生产潜力。
Data from 1999 to 2001 were adopted to calculate the potential maize productivity and get the average as the final result.
选取海伦市1999～2001年数据进行计算，取平均值代表近年来该地区玉米生产潜力。
Data from 1999 to 2001 were adopted to calculate the potential maize productivity and get the average as the final result.
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