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问题 问答题 简答题

竞争市场有效率吗？为什么？

答案

参考答案：是的，因为它使需求曲线以下和供给曲线以上的面积或总剩余最大化。

写作题
我们要有一个灿烂的未来。今天就要不懈的努力，紧张而忙碌的学习生活使我们更加充实，根据下表提示以My Day为题，写一篇60个词左右的短文，可适当发挥，至少用英语表达3个时间。
6:30 a.m.
get up
6:45 a.m.
breakfast
7:00 a.m.
go to school
7:30 a.m.
read English
5:50 p.m.
go home
6:15 p.m.
have dinner
7:20 p.m.
do homework
10:30 p.m.
go to bed（睡觉）
                                                      
                                                                                           
                                                                                           
                                                                                           
                                                                                           
                                                                                           
                                                                                           
                                                                                           
                                                                                           
                                                                                           
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单项选择题

通信故障泛指通道（）的故障，在WDM侧和SDH侧均存在通信故障。

A.中断。

B.存在误码。

C.告警。

D.中断或存在误码。
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