便利收益模型（Convenience Yield Model）是以套利为基础的商品期货定价方法。该模型通过当前的商品现货价格和合适的便利收益来对商品期货合约进行定价。
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Coal resources; Mining rights; Convenience yield; Two-factor model.
煤炭资源；采矿权；便利收益；双因素模型。
The utility model has the advantages of simple structure double purposes in one machine, agility and convenience, and the utility model reduce the pollution of cake materials and enhance oil yield.
该压饼机结构简单，一机两用灵活方便，减少了对饼料的污染，提高了出油率。
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