甲烷化反应器氮气升温要求升至()以上。A.150℃ B.200℃ C.250℃ D.

题型:单项选择题

问题:

甲烷化反应器氮气升温要求升至()以上。

A.150℃

B.200℃

C.250℃

D.300℃

考点:乙烯装置操作工乙烯反应器系统乙烯反应器系统题库
题型:单项选择题

在有水的金属容器内作业时,照明灯的电压应为( )安全电压,并设防护罩。

A.12V

B.24V

C.36V

D.9V

题型:单项选择题

(二) 菜 地区进行网民上网方式调查,结果显示,当地网民规模约有400万,其中有6%的网民主要使用普通拨号上网,有65%的网民主要使用ADSL上网,24%的 网民主要通过LAN上网,3%的网民主要使用手机3G卡上网,另外还有2%的网民主要通过无线局域网(WLAN)上网。

该地区主要通过有线宽带接入方式上网的网民规模约为( )万。

A.96

B.260

C.356

D.380

题型:单项选择题

Ⅲ. 阅读(共两节,满分40分)
第一节:阅读理解(共15小题;每小题2分,满分30分)
阅读下面短文,掌握其大意,然后从41—55各题所给的四个选项(A、B、C、D)中,选出最佳选项,并在答题卡上将该项涂黑。
(A)
We're all connected. You can send an e-mail message to a friend, and your friend can pass it on to one of his or her friends, and that friend can do the same, continuing the chain. Eventually, your message could reach just about anyone in the world, and it might take only five to seven e-mails for the message to get there.
Scientists recently tested that idea in a study involving 24,000 people. Participants had to try to get a message forwarded to one of 18 randomly chosen people. Each participant started by sending one e-mail to someone they knew. Recipients could then forward the e-mail once to someone they knew, and so on.
Targets, who were randomly assigned by researchers from Columbia University in New York, lived in 13 countries. They included an Australian police officer, a Norwegian veterinarian, and a college professor.
Out of 24,000 chains, only 384 reached their goal. The rest petered out, usually because one of the recipients was either too busy to forward the message or thought it was junk mail.
The links that reached their goal made it in an average of 4.05 e-mails. Based on the lengths of the failed chains, the researchers estimated that two strangers could generally make contact in five to seven e-mails.
The most successful chains relied on casual acquaintances rather than close friends. That's because your close friends know each other whereas your acquaintances tend to know people you don't know. The phenomenon, known as the strength of weak ties, explains why people tend to get jobs through people they know casually but aren't that close to.
So, start networking and instant messaging now. As they say in show business: It's all about who you know.
41. If you want to get into touch with a stranger in the world, how many e-mails might it take for the message to reach him/her?
A. 5 to 7
B. 18
C. 13
D. 384
42. Which of the following is Not true about the test?
A. 24,000 people took part in the study and sent e-mails to people they knew.
B. The 18 targets were chosen by chance.
C. About 98.4% of the mails didn’t reach their goal because some people were too busy or they mistook the message for junk mail.
D. The targets come from 13 countries, such as Australia, Norway and New York.
43. What does the word “estimate” mean in the passage?
A. make sure
B. suppose
C. think over
D. imagine
44. Why do people tend to get jobs more easily through casual acquaintances than close friends?
A. Because close friends don’t talk with each other so much.
B. Because casual acquaintances can help you know more people and make more friends.
C. Because close friends don’t spend so much time gathering together.
D. Because casual acquaintances are kinder and more willing to help others.
45. In which part of a newspaper will readers read this passage?
A. Culture
B. Entertainment
C. Information and Technology
D. Health
题型:单项选择题

有关表皮囊肿,下列表述哪项不正确()

A.多因外伤后皮肤碎片植入而产生

B.囊为单个或多个,基底可以移动,但与皮肤常有粘连

C.囊内充满角质物及毛发

D.手术切除时,宜包括表皮和囊肿周围的皮下组织,可疑恶变时切除范围应扩大

E.其囊壁为皮肤复层鳞状上皮细胞的组织结构,无真皮组织层

题型:单项选择题

下列选中属于蒸的火候种类的是()。

A、小火慢蒸

B、中火慢蒸

C、中等大火慢蒸

D、中等小火慢蒸

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