在最后成交落槌前，拍卖师要有三次报价。用英语表示"最后一次机会"可以用以下哪几种说法表达（）。
A. calling once
B. last chance
C. calling twice
D. last calling
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被测要素为单一要素的形位公差有()、平面度、园度、();
在拍卖中，拍卖师应对参与竞买者表现出高度的职业精神与尊重。可翻译为（）
A. In conducting an auction ，the auctioneer must deal with customers in a manner exhibiting the highest standards of professionalism and respect。
B. An auctioneer must maintain absolute fidelity to client and the client's interests。
C. An auctioneer is duty bound at all times to abide by the laws and regulations governing his profession in all jurisdiction in which he conducts his practice。
D. The auctioneers shall not bid for the lots auctioned by Themselves。
伊恩面临着 a．递增的边际收益b．不变的边际收益 c．递增的边际成本d．不变的边际成本
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