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问题 选择题

平行四边形ABCD的周长32，5AB=3BC，则对角线AC的取值范围为（　　）

A．6＜AC＜10

B．6＜AC＜16

C．10＜AC＜16

D．4＜AC＜16

答案

∵平行四边形ABCD的周长32，5AB=3BC，

∴2（AB+BC）=2（

3
5
BC+BC）=32，

∴BC=10，

∴AB=6，

∴BC-AB＜AC＜BC+AB，即4＜AC＜16．

故选D．

单项选择题

债券远期市场对话报价窗口，所有计算项以下面哪项为基准计算？（）

A、净价

B、收益率

C、交易金额

D、净价或收益率中先输入的项
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单项选择题

In a CFA study seminar, the following comments were made: Comment 1: "In the short run, an increase in demand in a perfectly competitive industry will result in negative economic profit for some firms in the industry. " Comment 2: "In the long run, a permanent increase in demand in a perfectly competitive industry will result in zero economic profit for the firms in the industry. " Which of the following best describes the accuracy of these commentsComment 1 Comment 2（）①A. Correct Correct ②B. Correct Incorrect ③C. IncorrectCorrect

A. ①

B. ②

C. ③
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