因此，经济批量模型假设的前提条件并不完全成立，经济订货批量的计算公式也就需要改进。

Therefore, suppose the presupposition of economic batch quantity model not to be completely established, its calculating formula shall be needed to be modified.

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在计算订货计划的同时，针对不同的情况提出了经济定货批量算法和档次算法。

While calculating and ordering and planning, propose economy order goods batch algorithm and grade algorithm.

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