如果发现商品有严重质量问题。数量不符或者并不是您订购的产品，请您拒签，让快递公司直接退回，我们收到商品后会及时给您更换！
If the goods are found serious quality problem. Discrepancies or not you order the products, please you refused to express company directly, we receive goods return after you change time!
讨论了在一个时期内商品的订购价格有折扣，而且该商品的需求量是离散型随机变量的订购问题，得出了使利润最大化的最佳订购量的计算方法。
In a given period the seasonal goods can be ordered at a discount price, and the demand for the goods is an issue of discrete random variable.
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