彩色电视机电源电路采用光耦合器件的目的为了实现冷热底板的隔离。

题型:判断题

问题:

彩色电视机电源电路采用光耦合器件的目的为了实现冷热底板的隔离。

考点:高职试题对口专业考试河南省2010年对口升学考试电子专业真题
题型:判断题

阅读理解。

    We are all busy talking about and using the Internet, but how many of us know the history of the Internet?

    Many people are surprised when they find that the Internet was set up (建立) in the 1960s. At that time,

computers were large and expensive. Computer network (网络) didn't work well. If one computer in the

network broke down, then the whole network stopped. So a new network system (系统) had to be set up.

It should be good enough to be used by many different computers. If part of the network was not working,

information could be sent through another part. In this way computer network system would keep on working

all the time.

    At first the Internet was only used by the government (政府), but in the early 1970s, universities, hospitals

and banks were allowed to use it, too. However, computers were still very expensive and the Internet was

difficult to use. By the start of 1990s, computers became cheaper and easier to use. Scientists had also

developed software that made"surfing" the Internet easier.

    Today it is easy to get on-line and it is said that millions of people use the Internet every day. Sending e-mails

is more and more popular among young people. The Internet has now become one of the most important parts

of people's life.

1. How long has the Internet been used?[ ]

A. For about 10 years.

B. For about 20 years.

C. For about 40 years.

D. For about 60 years.

2. What would happen when one computer in the network broke down after the new network system was

    set up? [ ]

A. The other computers would wait.

B. The other computers would still work.

C. Some of the others still worked.

D. The other computers wouldn't work.

3. What is true about computers in the 1990s? [ ]

A. They became cheaper and easier to use.

B. They became larger and larger.

C. People couldn't buy them anywhere.

D. People could get information only from them.

4. What can we infer (推断) from the last sentence? [ ]

A. People will die without the Internet.    

B. All people should set up (建立) their own network.

C. People live easily without the Internet.      

D. People will more and more depend on (依赖) the Internet.

5. Which is the best title (题目) for this passage? [ ]

A. The History of the Internet

B. Computers and Information

C. Computers and the Government

D. The History of Computers

题型:判断题

2型糖尿病患者最常见的死亡原因是

A.感染

B.低血糖

C.糖尿病肾病

D.酮症酸中毒

E.心脑血管意外

题型:判断题

煤气中毒是二氧化碳中毒,如不及时抢救,可导致人员死亡。()

题型:判断题

如图所示,一名消防队员在模拟演习训练中,沿着长为12m的竖立在地面上的钢管住下滑。已知这名消防队员的质量为60kg,他从钢管顶端由静止开始先匀加速再匀减速下滑,滑到地面时速度恰好为零。如果他加速时的加速度大小是减速时的2倍,下滑的总时间为3s,那么该消防队员加速与减速过程的时间之比为________________________,加速与减速过程中所受摩擦力大小之比为_______________________。

题型:判断题

了解服务目标是否达成主要通过()获得。

A.针对服务目标的专项测评

B.针对服务质量的专项测评

C.日常的服务监测情况

D.日常的服务测量情况

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