简述通信系统综合布线中,电源线布线规则。

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问题:

简述通信系统综合布线中,电源线布线规则。

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阅读短文,选择正确答案。

News 1

       Yuan Longping, the father of hybrid rice (杂交水稻), won the World Food Prize on Monday. Yuan

developed the world first popular and widely known hybrid rice. Hybrid rice plants can make more rice than

common ones.

News 2

       Liu Xiang won China's first gold medal in the world championships (锦标赛) in 12.95 seconds. 

       "Everybody wants to win a world title. I was nervous before the race. But I dealt with it, so I'm very

happy," Liu said with a smile after the race.

       Some reporters noticed that at the start, Liu Xiang was crying. He said that is his way of letting off

pressure. "My start wasn't good, maybe because I was nervous or because I was a bit slow," he said. 

       Liu will run next at the Shanghai Grand Prix (大奖赛) meeting at the end of September. He is confident

after winning the gold medal. "I want people to know how fast I am," he said. "This is number one speed.

There's nothing I can't do."

News 3 

       Have you ever got angry at books that are full of mistakes? Don't worry, things will get better soon. Last

week, China started checking textbooks, dictionaries and children's books all over the country. The government

said the results of the check would come out at the end of June.

News 4

       Last Wednesday Medvedev (梅德韦杰夫) took over from Vladimir Putin (普京). At the age of 42, he

becomes the youngest president of modern Russia.

       Medvedev was born to a family of teachers. He read a lot from a young age. After university, the

soft-spoken young man went on to teach law at university and became very popular with his students.

       In 2005, Medvedev became the first deputy prime minister (第一副 * * ). But he was as friendly as before.

"He has not changed. He invited me to his home," said Vera Smirnova, Medvedev's first teacher. "In Russia, only

two politicians (政治家) have invited their first teachers to their homes, Medvedev and Putin."

1. Yuan Longping won the World Food Prize because he _______. [ ]

A. is the father of his children

B. likes to eat hybrid rice

C. developed hybrid rice

D. spent a long time to research hybrid rice

2. Why was Liu Xiang crying at the start? [ ]

A. It's his way to reduce pressure.

B. He was nervous.

C. He was a bit slow.

D. He was excited.

3. Checking textbooks, dictionaries and children's books will ________. [ ]

A. make sure the books are not too expensive

B. make the children unhappy

C. make sure there are few mistakes in them

D. make the government lots of money

4. According to News 4, Medvedev is now ________. [ ]

A. a lawyer

B. a teacher

C. the first deputy prime minister

D. the youngest president of modern Russia

5. What Medvedev's first teacher said shows ________. [ ]

A. Medvedev is as friendly as before

B. Medvedev and Putin were her students

C. Medvedev has changed

D. Medvedev and Putin invited her to their homes

题型:问答题 简答题

f(x),g(x)是定义在R上的函数,h(x)=f(x)+g(x),则“f(x),g(x)均为偶函数”是“h(x)为偶函数”的(  )

A.充要条件

B.充分而不必要的条件

C.必要而不充分的条件

D.既不充分也不必要的条件

题型:问答题 简答题

下列何者不是生命的现象[ ]

A.葵花向太阳

B.飞蛾扑火

C.腐肉生蛆

D.刀不磨要生锈

题型:问答题 简答题

任何含碳物质,只要测定其剩下的放射性()含量,就可推断出它的年龄。

A、碳-12

B、碳-13

C、碳-14

题型:问答题 简答题

开车时加热炉引燃料油循环目的是()。

A、脱水

B、尽早点火

C、平衡塔底液面

D、稳定燃料油压力

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