在有随机热噪声的信道上计算数据传输率时使用______。A.奈奎斯特定理 B.香农定

题型:单项选择题

问题:

在有随机热噪声的信道上计算数据传输率时使用______。

A.奈奎斯特定理

B.香农定理

C.两个都可以

D.两个都不可以

考点:计算机等级考试网络技术三级网络技术笔试
题型:单项选择题

氯乙烯能引起()

A.皮肤癌

B.间皮瘤

C.膀胱癌

D.白血病

E.肝血管肉瘤

题型:单项选择题

初产妇,23岁。孕42周,规律宫缩6小时,宫颈口开大4cm,胎膜破裂,羊水黄绿色,胎心率102次/分。首选的治疗措施是()。

A.静滴缩宫素加强宫缩

B.立即剖宫产

C.等待自然分娩

D.米索前列醇加强宫缩

E.静滴硫酸镁抑制宫缩

题型:单项选择题

C

In today's Internet age, online games can be a change from the pressure of school and work. However, they can also cause problems and unhealthy addictions. This is most clearly seen in the example of South Korea. This country has the world's highest percentage of high-speed Internet services. It has also a high number of game players who are addicted to online games.

In 2004, a young man died after playing online games almost nonstop for 86 hours. A 12-year-old boy stole $16,000 from his father to continue online games which he could not get away from. Such problems are spreading to other parts of Asia as well. In 2005, it was reported that about 80 percent of China's 13.8 million online game players were under 25.

And many of these were said to be addicted. Such numbers point toward a growing problem among Chinese youth.

Dr. Sue-Huei Chen, a psychologist (心理学家), discovered some signs of at-risk people. Such people often go online to escape from their problems. And they usually have no friendship or good social skills. They feel the need to spend more and more time online, so they may be absent from school or family. And they become upset if anyone tries to limit their online game playing.

64. The passage is mainly about _________     

A. online game addiction              B. problems caused by online games

C. computer problems in Asia         D. problems caused by young people

65. In the passage, the writer tells us a fact that_________      

A. South Korea has a large number of Internet schools

B. More and more young men are stealing money for online games

C. China's online game players are all under the age of 25

D. Online game addiction is a very common problem in South Korea

66. After reading the passage,, we know that in China_________        

A. many young people are playing online games for fun

B. many young people are getting addicted to online games

C. only those under 25 like to play online games for long periods

D. 80 percent of the Chinese depend on online games to get relaxed

67. According to the passage, ____________are more likely to become addicted to online games.

A. people under great pressure from school and work

B. people well-known in the field of computer games

C. people with unsolved problems and few friends

D. people who'd like to take a risk in computer games

题型:单项选择题

企业负债的减少可能会引起( )。

A.所有者权益减少

B.资产增加

C.资产减少

D.收入减少

题型:单项选择题

某双代号网络计划中(以"d"为单位),工作A的最早开始时间为6,工作持续时间为4;工作B的最迟完成时间为22,工作持续时间为10;工作C的最迟完成时间为20,工作持续时间为5。已知工作A只有B、C两项紧后工作,工作A的总时差为()d。

A.2

B.3

C.5

D.6

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