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【单选题】
（ ）, businesses offer services for which they charge a fee that is based on the number of size of transactions they process.A.
In the fee-for-transaction revenue model
B.
In the web catalog revenue model
C.
In the traditional catalog-based retail revenue&39; model
D.
In the advertising-supported revenue model
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举一反三
【单选题】患者,近几日眼内有异物感,分泌物增多,并伴有畏光、流泪,诊断为沙眼,应选用下列何种磺胺类药
A.
磺胺嘧啶银
B.
磺胺甲噁唑
C.
磺胺醋酰钠
D.
磺胺米隆
E.
磺胺嘧啶
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