The variation of inventory turnover ratio is the inventory turnover in days, the latter means the average days the inventory is sold out.

存货周转率的另外一个变异指标是存货周转天数，后者意味着存货在多少天里被销售出去。

youdao

This article studies the optimal policy of production-inventory model in which time cycling is limited and cost parameter varies in stepped variation, and the definite way of cost parameter.

本文研究时间周期有限，费用参数呈阶梯变化的生产-库存模型的最佳策略及参数的确定途径。

youdao