There are different factors to impact producing technical efficiency in main grain producing area;
②三种粮食作物的生产技术效率所受影响因素不同；
The main grain-producing area is the main body of China agriculture production, especially of grain producing.
粮食主产区是我国农业生产尤其是粮食生产的主体。
Yuncheng basin is the main grain and cotton producing area of Shanxi Province.
运城盆地是山西省的主要粮棉产区。
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