通过对两级库存水平之间及它们与客户随机需求变量之间的关系分析，我们得到了最优的订货策略和最优的运输频率。
By analyzing the relations of two? Echelon inventory level and customer random demand at stores this paper gets optimum order policies.
另外在两级过滤装置之间增设增压泵，实现熔体的供应稳定。
In addition, a booster pump is arranged between the two stages of filter devices, thus achieving stable supply of fusant.
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