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问题 选择题

为了解中国古代和谐社会的典范，小龙在学校图书馆借了一本《贞观政要》，他是为了探究下列哪一位皇帝的政绩？[ ]

A．汉武帝

B．唐太宗

C．唐玄宗

D．宋太祖

答案

答案：B

名词解释

管状侵蚀
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单项选择题

An analyst does research about monopolistic competition. Which of the following statements is most accurate Long-run economic profit under monopolistic competition is zero because:（）

A. entry into and exit from the market are possible with fairly low costs.

B. each firm produces a differentiated product.

C. two or more firms have the incentive to collude.
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