问题 单项选择题

某幼儿园教学楼为3层混合结构,基础采用M5水泥砂浆砌筑,主体结构采用M5水泥石灰混合砂浆砌筑 2层有一外阳台,采用悬挑梁加端头梁结构。悬挑梁外挑长度为2.4m,阳台栏板高度为1.1 m。为了增加幼儿活动空间,幼儿园在阳台增铺花岗石地面,厚度为100mm,将阳台改为幼儿室外活动场地。另外有一广告公司与幼儿园协商后,在阳台端头梁栏板上加挂了一个灯箱广告牌,但经设计院验算,悬挑梁受力已接近设计荷载,要求将广告牌立即拆除。

按荷载随时间的变异分类,在阳台上增铺花岗石地面,导致荷载增加,对端头梁来说是增加()。

A.永久荷载

B.可变荷载

C.间接荷载

D.偶然荷载

答案

参考答案:B

阅读理解

阅读理解。

     Modern inventions have speeded up people's lives amazingly. Motor-cars cover a hundred miles in

little more than an hour, aircraft cross the world inside a day, while computers operate at lightning speed.

Indeed, this love of speed seems never-ending. Every year motor-cars are produced which go even faster

and each new computer boasts (吹嘘) of saving precious seconds in handling tasks.

     All this saves time, but at a price. When we lose or gain half a day in speeding across the world in an

airplane, our bodies tell us so. We get the uncomfortable feeling known as jet-lag; our bodies feel that they

have been left behind in another time zone. Again, spending too long at computer results in painful wrists

and fingers. Mobile phones also have their dangers, according to some scientists; too much use may

transmit

harmful radiation into our brains, a consequence we do not like to think about.

     However, what do we do with the time we have saved? Certainly not relax, or so it seems. We are so

accustomed to constant activity that we find it difficult to sit and do nothing, or even just one thing at a time.

Perhaps the days are long gone when we might listen quietly to a story on the radio, letting imagination take

us into another world.

     There was a time when some people's lives were devoted simply to the cultivation of the land or the care

of cattle. No multi-tasking there; their lives went on at a much gentler pace, and in a familiar pattern. There is

much that we might envy about a way of life like this. Yet before we do so, we must think of the hard tasks

our ancestors faced: they farmed with bare hands, often lived close to hunger, and had to fashion tools from

wood and stone. Modern machinery has freed people from that primitive existence.

1. The new products become more and more time-saving because _____.

A. the manufacturers boast a lot

B. time is limited

C. the prices are increasingly high

D. our love of speed seems never-ending

2. What does "the days" in Paragraph 3 refer to?

A. Simple life in the past.

B. Imaginary life.

C. Times of inventions.

D. Time for constant activity.

3. What is the author's attitude towards the modern technology?

A. Critical.

B. Optimistic.

C. Objective.

D. Negative.

4. What does the passage mainly discuss?

A. The present and past times.

B. Modern technology and its influence.

C. Imaginations and inventions.

D. Machinery and human beings.

单项选择题