问题 单项选择题

关于打入桩施工技术要求的说法,错误的是()。

A.水泥混凝土桩要达到100%设计强度并具有28d龄期

B.在打入桩的过程中,应始终保持锤、桩帽和桩身在同一轴线上

C.打密集群桩,一般是由前排向后排打

D.打桩时以控制桩尖设计标高为主

答案

参考答案:C

解析:水泥混凝土桩要达到100%设计强度并具有28d龄期,故A选项正确;在桩的打人过程中,应始终保持锤、桩帽和桩身在同一轴线上,故B选项正确;沉桩时,以控制桩尖设计标高为主,故选项D正确;密集群桩由中心向四边打,故选择C选项。

阅读理解

It is sometimes said that strange flying objects have been seen high up in the sky. People call these strange objects Unidentified Flying Objects (UFO). These UFOs caused a lot of interest. Some of the reports about them are difficult to believe. Some have been explained in scientific ways. Others have never been explained. Here is an account of UFOs from a report.

Dennis Burdens, who wrote an article, tells us that he once saw a UFO himself. He was having dinner one night with a friend near Tripoli, Libya, and after dinner the two men walked across a yard to his room to look at some papers. Burdens noticed that the moon looked strange that night.

“It wasn’t the moon ”, was the reply.

They watched the light and saw that it was moving. It seemed to be an object rather like a big plate. In some ways it looked like smoke with a light on it, but it wasn’t smoke because it didn’t change its shape. It was moving in a regular way. That is to say, it didn’t go suddenly faster or more slowly, and it didn’t go higher or lower. So the two men decided that there must be men in it.

After that, Burdens said that he felt eyes looking at him. He was being watched in the darkness.

When it was nearer, they noticed that the bottom parts were brighter than the top. The bottom was yellow and the top red. Then the object suddenly turned away and left Libya, moving very fast.

On a later day Burdens talked to other people about it, and he found some who had seen it. They all described it in the same way. Could they all be mistaken?

小题1: UFOs are _____.

A.flying high up in the sky

B.strange flying objects

C.difficult to believe

D.very interested小题2: A UFO was seen one night _____.

A.when they were walking across a yard to Burdens’ room

B.while they were looking at the light

C.when Burdens noticed the moon appearing strange

D.while they were having dinner小题3:The UFO moved _______.

A.regularly

B.in a changeable way

C.slowly

D.fast小题4: The UFO looked like _____ .

A.smoke

B.a large plate

C.light

D.a jumping object小题5:The UFO was seen ______ .

A.by Burdens and his friend

B.brighter in the darkness

C.by several people

D.to have a yellow bottom and a red top in the same way

单项选择题