The main function of the safety stock is securing against the demand variation during the replenishment lead time.
的安全库存的主要职能是对安全的需求变化，在补充的准备时间。
Supervise and update material unit price, supplier information and minimum stock, lead time of each model for PMC and other documents in purchasing department.
管理并更新材料单价、供应商信息、最小库存、每种材料的采购时间和采购部的其它文件；
This part studies two problems: transportation model of delivery stock cost and inventory model for unconfirmed lead time.
在此基础上重点研究了两个问题，即考虑在途库存成本的运输模型以及需求与前导时间不确定的存储模型。
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