问题 问答题

简述综合布线系统的接地设计要求。

答案

参考答案:

(1)在电信间、设备间及进线间应设置楼层或局部等电位接地端子板。

(2)综合布线系统应采用共用接地的接地系统。

(3)楼层安装的各个配线柜应采用适当界面的绝缘铜导线单独布线至就近的等电位接地装置,也可以采用树精内等电位接地铜排引到建筑物共用接地装置。

(4)综合布线的电缆采用桥架或钢管敷设时,桥架或钢管应保持连续的电器连接,并应有不少于两点的良好接地。

(5)当缆线从建筑物外面进入建筑物时,电缆和光缆的金属护套或者金属件应在入口处就近与等电位接地端子板连接。

阅读理解

If the rose can be said to be a special flower, then the apple can be said to be a special fruit.It is very important in American culture.American stories speak of Johnny Appleseed, who went throughout America collecting apple seeds and planting apple trees.He had a great love for nature and went through fields and farms adding richness and beauty to the country.

One of the first sayings taught to school children is, “An apple a day keeps the doctor away.” This short saying encourages children to eat fresh fruit to keep healthy. If someone always says good words to a person, people will call him an “apple polisher”.This, however, is not a good name.If someone is very dear to us, we say that he or she is the “apple of our eye”.

Most people believe that the fruit which Eve gave to Adam was an apple, even though the Bible (圣经) never says so.The apple, therefore, is a deep part of the language and stories of America.

An apple is also delicious.Apples can be cooked in many ways, used as a dessert, and made into sweet juice.

In many parts of the country during the harvest season, a popular activity is to go into an apple garden to pick apples.Washington, D.C.and New York are both famous for their apples.

Finally, when it’s time to take a vacation to American cities, one can always visit New York, which is “the biggest apple” of all the American cities.

小题1:During these years, iphones are popular with the people all over the world. Which country is his starter--Steven Paul Jobs from?

A.America

B.England

C.Russia

D.Japan小题2:Why was Johnny Appleseed so famous?

A.He had a great love of nature.

B.He liked the American people.

C.He went throughout the country.

D.He collected apple seeds and planted apple trees.小题3:What does the underlined phrase “apple polisher” in Paragraph 2 mean?

A.Something for cutting apples.

B.A person who likes to please others.

C.A person who is dealing with fruits.

D.A machine for cleaning apples quickly.小题4:Which of the following is TRUE with apples?

A.Apples are medicine.

B.Apples are the most important food.

C.New York is famous for its big apples.

D.The Bible says Adam was given an apple.小题5:The passage is mainly about ___________.

A.apples in American culture

B.stories about the apple

C.some famous sayings of the apple

D.big cities that are famous for apples

单项选择题