搜题请搜索小程序“爱下问搜题”
问题 判断题

一个证券组合的风险大小仅与构成该组合的各单位证券的风险大小和投资比例有关。 ( )

答案

参考答案：错

解析： 一个证券组合的风险大小不仅与构成该组合的各单位证券的风险大小和投资比例有关，而且与其组合协方差也有关。

阅读理解

Little Smart or Xiaolingtong is becoming more and more popular in China. But you can use it only in your city. If you go to another city, it will have no use. It looks like a mobile phone, but the service(服务 )is quite cheap. We only need to pay about 20 yuan a month for the line and about 0.1 yuan each minute for the talk. What’s more, you don’t have to pay any money when someone else calls you.

But little Smart is not really so smart. Users often complain about( 抱怨) its bad voice. “ I can’t make or get a phone call when I am on a bus,” a person in Hangzhou said. Scientists are trying their best to make Little Smart smarter. And the latest Little Smart even has a color screen.

小题1:Little Smart is popular because__________________.

A．the service of it is very cheap

B．it’s very expensive

C．it’s very smart

D．it’s very useful in another city小题2:You can use your Litter Smart_____________.

A．in some cities

B．in any city

C．only in the buses

D．only in your city小题3:The latest Little Smart______________.

A．has good sounds

B．has a colour screen( 屏幕)

C．has a bad voice

D．is not smarter小题4:If someone calls you by your Little Smart, you should pay____.

A．20 yaun

B．0.1 yuan

C．0.1 youan a minute

D．nothing
查看答案
解答题

6：18的比值是1：3．______．
查看答案