问题 多项选择题

以下关于空间分集的说法,正确的是()。

A.采用多个接收天线同时接收信号,并通过信号合并获得分集增益

B.各个接收天线之间的信号必须不相关,或相关性很小

C.当基站使用多个接收天线时,同常天线之间的距离要求在几十个波长以上

D.采用水平间隔分集方式比垂直间隔分集方式的性能通常要好。当天线在水平方向上空间分集时,各天线接收到的信号平均强度基本相等

E.对于空间分集,常用的合并方式是选择性合并

答案

参考答案:A, B, C, D, E

阅读理解

Jenny Bowen, an American living in Beijing, was selected as the only American to carry the 2008 Beijing Olympic torch on Chinese soil.She and seven other non-Chinese winners had been chosen from 262 applicants from 47 countries in a contest organized by Chinese computer maker Lenovo Group and the official English-language newspaper, China Daily.When Bowen ran with the Olympic torch, she was not only representing the United States, but also representing thousands of Chinese orphans (孤儿).

Bowen, a mother of two adopted (收养) Chinese daughters, is director of Half the Sky Foundation, an organization which was founded in 1998 and aims to enrich the lives of orphaned children in China.In nearly 10 years, Bowen and Half the Sky have touched the lives of over 13,000 children.Half the Sky is now present in 36 welfare institutions in 28 Chinese cities. About 4,000 children are active in the program, which provides trained staff, educational tools, medical support and care for orphans.

Bowen hoped that running with the Olympic torch would help draw attention to the children in China.She was among 19,400 runners who carried the flame along an 85,000-mile, 130-day route across five continents.Beijing organizers say it was the longest torch relay in Olympic history.

Like Bowen, the seven other non-Chinese winners, including a German engineer and a Venezuelan designer, live in China.Other countries represented were the Philippines, Colombia, India, Japan and Russia.

According to Olympic organizers, candidates (候选人) were selected based on an online vote, committee selection, their “love of Chinese culture and history” and devotion to “communicating information of a real China to their native countries”.Each runner carried the torch for 200 meters on Chinese soil.

1.Bowen hopes that being a torch runner would help ________.

A.collect educational tools, medical support, etc, for orphans

B.make Half the Sky Foundation well known

C.draw special attention to orphans in China

D.communicate information of America

2.According to the text, Jenny Bowen ________.

A.is interested in Chinese sports

B.founded the organization of Half the Sky

C.has adopted 13,000 children during 10 years

D.loves Chinese culture and history

3.Which of the following about the 2008 torch relay is WRONG?

A.The contest for its runners is organized by Lenovo Group and China Daily.

B.It has eight foreign runners, including an American, a German and a Venezuelan.

C.It will be the longest relay with the most runners in Olympic history.

D.It will be an opportunity to communicate information of a real China to the world.

4.What’s the best title for the passage?

A.Happy Life of a Great US Woman in China

B.A US Woman Carrying 2008 Olympic Torch in China

C.The Development of Half the Sky Foundation

D.The Longest Torch Relay in Olympic History

多项选择题