问题 单项选择题

一轴心受压砖柱,截面尺寸为370mm×490mm,两端为不动铰支座,H0=H=3.5m。材料强度等级为砖MU10,砂浆采用混合砂浆,砖砌体自重19kN/m3。若柱顶截面上作用由恒载和活载产生的轴向力设计值为200kN,施工质量控制等级为B级。

柱底截面所承受的轴力设计值与( )项值接近。

A.237.84kN
B.276kN
C.214.47kN
D.200kN

答案

参考答案:C

解析: N=200+1.2×(0.37×0.49×3.5×19)=214.47kN

单项选择题
阅读理解

阅读理解

     When we offer our best wishes to others, more often than not, we say: "May you be happy every

day". But it's easier said than done to stay happy all the time. There are always things that stand in its

way.

     The first, perhaps the biggest is genetics. Some scientists say that some people are naturally happier

than others. Besides, major life events as well as social and economic factors can also stand in the way

of happiness, such as losing your job or a family member. Then, there is health affecting your happiness.

So, is it possible that people can find lasting happiness with so many factors preventing them?

     Positive psychologists(心理学家)believe it's possible for people to stay happy for long periods,

although it cannot be lasting. Martin Seligman at University of Pennsylvania argues that daytoday

happiness comes from two things: pleasures and satisfactions. Pleasures are rich experiences that simply

make us feel good things like eating cake or drinking wine. While pleasures can be quite satisfying, the

enjoyment we get from them is shortlived.

     Satisfactions are activities that we like to do and we give all we have to them. They are often

challenging, and we have to draw_on personal skills and strengths to perform them. For some people,

satisfactions come with work. Doctors, for example, often become so concentrated in an operation that

hours pass without them noticing the time. For others, it may be hobbies like gardening, playing tennis or

stamp collecting. These satisfactory activities affect the mood in a way that appears to be lasting.

     Too often, people choose pleasures over satisfactions because they are easier and the effects are

more immediate. Though pleasures may work for a while, there are bad effects. Pleasurable activities

become less enjoyable if overused. Always choosing pleasures over satisfactions can also prevent people

from developing their personal strengths, which, if they're not put to work, will die.

1. How many aspects are mentioned that affect one's staying happy?

A. Two. 

B. Three.

C. Four.  

D. Five.

2. Compared with pleasures, satisfactions ________.

A. have immediate effect and work quickly

B. are more meaningful and last longer

C. are more easily ignored by people

D. depend mostly on one's genetics

3. The underlined phrase "draw on" means ________.

A. learn  

B. find  

C. improve  

D. use

4. What is the best title for the passage?

A. How to Be a Happier Person?

B. It's Impossible to Stay Happy Long.

C. Pleasures Are Different From Satisfactions.

D. The Factors That Affect Our Happiness.