【单选题】【消耗次数：1】
8.We have very much ______ your prompt attention to our request.
①
enjoyed
②
appreciated
③
liked
④
. reduced
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相关题目
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8.______ your request for a make-up test, we have referred the matter to the school authority.
①
For the purpose of
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①
正确
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have read
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postpone
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refuse
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delay
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①
随着产量的增加而增加，并小于平均成本
②
随着产量的增加而减少，并大于平均成本
③
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边际收益是指（ ）。
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增加一单位产量所导致的总产量的增加量
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增加一单位某投入要素引起的总成本增加量
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边际产品等于要素的价格
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边际收益等于要素的价格
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④
要素的边际成本等于价格