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动态储备包括若干方面的动态要素，例如：储备粮总规模、库存形态(储备粮实物库存与现金库存的组合)、品种结构或时空布局等。
Dynamic reserve includes several changing factors, such as general scale of grain reserve, stock pattern (combination of physical stock and cash stock), variety structure and space-time layout.
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