网桥是在以下哪个层上实现不同网络的互联设备A.数据链路层 B.网络层 C.对话层 D

题型:单项选择题

问题:

网桥是在以下哪个层上实现不同网络的互联设备

A.数据链路层

B.网络层

C.对话层

D.物理层

考点:计算机等级考试网络技术计算机三级(网络技术)11
题型:单项选择题

中国古代以干支纪年,天干是“甲、乙、丙、丁、戊、己、庚、辛、壬、癸”,地支是“子、丑、寅、卯、辰、已、午、未、申、酉、戌、亥”。甲午战争发生于1894年,八国联军侵华的1900年应是()

A.己亥年

B.庚子年

C.辛丑年

D.壬寅年

题型:单项选择题

股票市场的首要功能是( )。

A.优化资源配置

B.转换机制

C.筹集资金

D.分散风险

题型:单项选择题

阅读理解。

                                                             A Giant Leap for China

     A few days ago, he was just Colonel(上校) Yang; few people knew his name or recognized his face. But

last Thursday, when he came back to the earth after a 21-hour trip to space, Yang Liwei's smile was seen

across the world above the magic words:"China's first spaceman".

     The 38-year-old astronaut was sent into space at 9 a.m. Last Wednesday by China's Shenzhou Ⅴ

spacecraft, which orbited the earth 14 times. He landed safely at 6:23 a.m. The next day, making China the

third country successfully send a person into space, after the former Soviet Union and the US.

     Yang was satisfied with his job."I have seen many landing scenes before on video, and I think ours was

one of the most successful," He said on a special plane to Beijing after landing. Born into an ordinary family in

Liaoning Province, he became a pilot in the Chinese Air Force in 1987,spending 1350 hours in the air. He joined

the Chinese space programme 11 years later.

     While in space, Yang recorded everything he saw as well as showing China's national flag and the United

Nations' flag to the people watching on TV at home. He also ate a meal of diced chicken and fried rice, before

taking a 3-hour nap. The whole project went according to plan, but space exploration is not as easy as it seems.

     Anyone who saw the destruction of the US space shuttle Columbia in February this year will know that

Yang took a great risk.

     He experienced extremely high temperatures, while the gravitation (重力) on take-off and landing were

strong enough to force tears from his eyes.

     He has spent five years training to become a spaceman.

      "I eat all of my meals at the space programme's dinning room and have never been able to take my son to

kindergarten," he said."I've never met his teachers."

     But becoming China's first spaceman has made all the effort worthwhile. "When I boarded the spacecraft

for the first time,I couldn't help feeling excited," he said."I decided that I had to fly it."

     To Chinese people, Yang is now a hero. One visitor to a Xinhua news agency online forum(网上论坛)said,

"Yang's trip is a giant leap forward for China."

     Officials say the next Shenzhou will be launched by 2005.China also plans to develop spacewalking and a

space lab.

1. What is the main idea of the story?

A. China's first manned flight.

B. A hero with great courage.

C. The first Chinese man in space.

D. How Yang Liwei became China's first spaceman.

2. How long did each of Yang's orbits take on average?

A. 1 hour.       

B. 1.5 hours.

C. 6 hours.      

D. The story didn't mention it.

3. Why did the writer mention the gravitation forces on take-off and landing?

A. Because it was the most dangerous part of the space flight

B. Because it was a very special experience.

C. To stress how much training he had to do to prepare for the flight.

D. To show that Yang is brave. 

4. Why did the writer use "giant leap" in the title?

A. Because the space flight marked China's great progress in the field of space exploration.

B. Because Neil Armstrong said it was a"giant leap" for mankind when he first set foot on the moon.

C. Because the space flight was a huge success.

D. Both A and B.

5.This passage is most likely to appear in________.

A. newspaper       

B. textbook

C. science magazines       

D. biographies(传记)

题型:单项选择题

散水的宽度一般为,当屋面为自由落水时,应比屋檐挑出宽度大()、()。

题型:单项选择题

编制家系图时,其基本设计应为

A.含三代或三代以上

B.在家系图上应标明家庭中出现的各种压力事件和发生时间

C.子女应按年龄大小依次从左向右排列

D.夫妻应男在左,女在右,并标明婚姻状况

E.包括以上全部内容

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