下列工人工作时间消耗中,属于有效工作时间的是()。 A.因混凝土养护引起的停工时间

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问题:

下列工人工作时间消耗中,属于有效工作时间的是()。

A.因混凝土养护引起的停工时间

B.产品质量不合格返工的工作时间

C.准备施工工具花费的时间

D.偶然停工(停水、停电)增加的时间

考点:建设工程施工管理(二建)二建建设工程施工管理综合练习二建建设工程施工管理综合练习题库
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维护文件的高度严密性是指()。

A.公文的保密性

B.公文语言结构的严密

C.公文行文文字的严密

D.施行办法的严密

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用树型结构表示实体类型及实体间联系的数据模型称为 【2】

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阅读理解。

     British paychologists have found evidence of a link between excessive (过度的) Internet use and

depression, a research has shown.

     Leeds University researchers, writing in the Psychopathology journal, said a small part of Internet

users were classed as Internet addicts and that people in this group were more likely to be depressed

than non-addicted users.

     The article on the relationship between excessive Internet use and depression is from a

questionnaire-based study of 1,319 young people and adults.

     The respondents answered questions about how much time they spent on the Internet and what they

used it for; they also complete the Beck Depression Inventory---a series of questions designed to

measure the seriousness of depression.

     The six-page report,by the university's Institute of Psychological Science, said 18 of the people who

complete the questionnaire were Internet addict."Our research indicates that excessive Internet use is

associated with depression, but what we don't know is which comes first-are depressed people drawn

to the Internet or does the Internet cause depression?" the article's lead author Dr Catriona Morrison

said."What is clear is that, for a small part of people, excessive use of the Internet could be warning signal

for depressive tendencies."

     The age range of all respondents was between 16 and 51 years, with an average age of 21.24. The

average age of the 18 Internet addicts was 18.3 years. By comparing the levels of depression within this

group to that within a group of 18 non-addicted Internet users, researchers found the Internet addicts

had a higher chance of developing depression than non-addicts. They also discovered that addicts spent

more time visiting sexually pleasing website, online gaming sites and online communities.

     "The public speculation (推测) was further proved by this study. That's to say, over-engaging in

websites which serve to replace normal social function might be linked to psychological disorders like

depression and addiction," Morrison said."We now need to consider the wider social influence of this

relationship and clearly prove the effects of excessive Internet use on mental health."

1. Internet addicts are people who ______ according to the passage.

A. use the Internet more than enough     

B. feel depressed when using the Internet

C. seldom connect to the Internet        

D. feel depressed without the Internet

2. What is confirmed by the study according to the passage?

A. Depression leads to excessive use of Internet

B. Depression results from excessive use of Internet

C. Excessive use of internet usually accompanies depression

D. Excessive use of internet is usually earlier to depression

3. It is thought by the public that online communities______.

A. can never replace normal social function

B. are intended to replace normal social function

C. are associated with psychological disorders

D. shouldn't take the blame for psychological disorders

4. According to Dr Catriona Morrison, the public speculation________.

A. lacks scientific evidence      

B. helps clarify their study

C. finds a theoretical basis      

D. has little scientific value

题型:单项选择题

简述无线通信信道的基本特征。

题型:单项选择题

微波中继通信与()相比,微波具有通信容量大,传输质量高这两个显著特点。

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