It is great important to study an inventory model for deteriorating items with variable positivelead time where items deteriorated at a constant rate.
在研究易腐库存模型时，讨论提前时间对易腐物品库存模型的影响是有重大意义的。
3
They also agreed that there were still too many problems in the experiments which could lead to positive results, and they drew up a list demanding new standards for future research.