负责库存成本的审核、计算和更新，执行库存的估价和差异分析。
Check, calculate and update item cost of inventory, responsible also for inventory valuation and variance analysis.
如果不计算大批量购买打给的折扣，总成本就是库存和采购费用的总和。
In the absence of any quantity discounts total cost is a function of the cost of holding stock and the cost of purchasing.
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