fixed lead造句

First , 3 classic modules been set up under the assumption that all demands would be fulfilled with the stable supply sources . i . e fixed qty procurement module ; fixed lead time procurement module and single life cycle procurement module - - - news boy module ( all above 3 modules are without the consideration of price impact )
首先,建立了对产品的所有需求都必须满足供应源是可靠条件下的三个经典的基本模型,即研究分析了不考虑价格因素的连续订货的定量订货模型、定期订货模型,以及面向随机需求的单周期订货模型?报童模型。
It's difficult to find fixed lead in a sentence. 用fixed lead造句挺难的