在完全竞争市场上，一个厂商对某种生产要素的需求曲线（）。

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【多选题】【消耗次数：1】

① 本质上与消费者对商品的需求是相同的

② 因边际收益递减规律而向右下方倾斜

③ 因厂商所生产的产品价格提高而向右下方倾斜

④ 随着要素价格提高而向后弯曲

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