问题 单项选择题

工程基坑开挖采用井点回灌技术的主要目的是()。

A.避免坑底土体回弹 

B.避免坑底出现管涌 

C.减少排水设施,降低施工成本 

D.防止降水井点对井点周围建(构)筑物、地下管线的影响 

答案

参考答案:D

解析:基坑开挖,为保证挖掘部位地基土稳定,常用井点排水等方法降低地下水位。在降水的同时,由于挖掘部位地下水位的降低,导致其周围地区地下水住随之下降,使土层中因失水而产生压密,因而经常会引起邻近建(构)筑物、管线的不均匀沉降或开裂。为了防止这一情况的发生,通常采用设置井点回灌的方法。考点 建筑工程土方工程施工技术

改错题

第二节短文改错(共10小题;每小题1.5分,满分15分)

此题要求改正所给短文中的错误。对标有题号的每一行做出判断;如无错误,在该行右边横线上画一个勾( √ );如有错误(每行只有一个错误),则按下列情况改正:

此行多一个词:把多余的词用斜线(\ )划掉,在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处加一个漏词符号( ∧ ),在该行右边横线上写出该加的词。

Once there lived a boy was very fond of                         76________

reading. But he was so poor to buy any                          77________

books. So he had to borrow them from a rich man                78________

lived far away. The boy always tried                            79________

hard to finish read the books and returned                       80________

them to the owner within the giving time. So                    81________

the rich man was ready lending him any of the                    82________

books he wanted them. In this way he read a lot                   83________

and late became a well-known writer of his time.                  84________

However, the rich man’s son who didn’t like to study

remained a man with a little knowledge.                          85________

单项选择题