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问题 单项选择题

解热镇痛药退热的机制是（）

A.抑制中枢前列腺素（PG）的合成

B.抑制外周PG的合成

C.抑制中枢PG的降解

D.抑制外周PG的降解

E.增加中枢PG的释放

答案

参考答案：A

单项选择题

样本大小字码表中的大写字母表示：（）。

A.样本大小

B.批量大小

C.样本大小字码

D.检查水平
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单项选择题

Which of the following is least likely to be considered a necessary condition for a monopolist to realize profits from price discrimination（）

A. A product for which the demand curve is downward sloping.

B. At least two groups of customers, each with a different price elasticity of demand.

C. Two different costs of production.
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