问题 多项选择题

关于刚性基础,下列说法正确的是( )。

A.所用材料抗压强度低

B.所用材料抗拉强度高

C.所用材料抗剪强度低

D.构造上通过限制基础的高宽比来满足刚性角的要求

E.混凝土基础为刚性基础

答案

参考答案:C,D,E

解析:刚性基础所用的材料如砖、石、混凝土等,它们的抗压强度较高,但抗拉及抗剪强度偏低。用此类材料建造的基础,应保证其基底只受压,不受拉。由于受地耐力的影响,基底应比基顶墙(柱)宽些。根据材料受力的特点,不同材料构成的基础,其传递压力的角度也不相同。刚性基础中压力分角。称为刚性角。在设计中,应尽力使基础大放脚与基础材料的刚性角相一致,以确保基础底面不产生拉应力,最大限度地节约基础材料。受刚性角限制的基础称为刚性基础。构造上通过限制刚性基础宽高比来满足刚性角的要求。

阅读理解

Sometimes life gets a little dull. What used to be fun and different becomes boring. That is the time to look for something new. It is the time for a big idea to get your mind off everyday life. So why not search for extraterrestrial (地球外的) intelligence? Or even better, why not get your computer to do it for you?

Over two million people have joined the Search for Extraterrestrial Intelligence(SETI)project. Based in California, the SETI project analyzes information taken from a giant radio telescope based in South America. Its task is to look for signals from outer space that might prove that life exists on other planets.

Processing this information is far too big a job for one computer. So the SETI project workers divide the work among volunteers who visit their website. Each computer gets some information to work out from the SETI network through the Internet. This process is often known as “meta-computing”.

It is a wonderful thought. You are sleeping, eating a meal or going out with friends. All this time, your computer is searching the stars for signs that might show something is out there trying to get in touch. Volunteers are proud of being involved in the SETI project. It shows that they understand the potential (潜能) of computing. They know that it is more than just a way of working or playing games.

Meta-computing may also be creating intelligence as well as looking for it. This idea is based on the theory that human intelligence is created by the way in which different parts of the brain communicate with each other. As the saying goes, “The whole is more than the sum of its parts.” People who join the SETI project sometimes wonder whether their computer will become part of a huge network that has learned to think for itself.

小题1:According to the writer, meta-computing may be creating intelligence    .

A.because human beings are intelligent

B.because a computer works as the brain does

C.because of a network of many computers

D.because of the number of computers小题2: Which of the following shows the order in which the SETI network works?

A.Radio telescope→SETI website→Volunteers’ computer→SETI base

B.Radio telescope→SETI base→SETI website→Volunteers’ computer

C.SETI base→SETI website→Volunteers’ computers→Radio telescope

D.SETI base→Radio telescope→SETI website→Volunteers’ computers小题3: The underlined word “it” in the last paragraph refers to _____ .

A.extra-terrestrial intelligence

B.human intelligence

C.the SETI project

D.meta-computing小题4:The passage mainly tells us about _____.      

A.a new way to work on the computer

B.a new way to work and play games

C.a new way to search for life outside the earth

D.a new way to make computers learn to think for itself

单项选择题