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【单选题】
SEM(搜索引擎推广)是指卖家通过对商品相关关键词出具一定的竞价价格,获得靠前搜索排名的商品推广方式。其中向搜索引擎提供如何计算付费:A.
按单次点击付费，并设置付费总额。
B.
按单次展现付费，并设置付费总额。
C.
按时间付费，并设置付费总额。
D.
仅设置付费总额。
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