挖孔灌注桩适用于什么情况?和钻孔灌注桩相比有什么优点?

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问题:

挖孔灌注桩适用于什么情况?和钻孔灌注桩相比有什么优点?

考点:岩土工程基础知识第十七章土力学与基础工程第十七章土力学与基础工程题库
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计算x2﹣(x﹣5)(x+1)的结果,正确的是[ ]

A.4x+5

B.x2﹣4x+5

C.﹣4x﹣5

D.x2﹣4x+5

题型:问答题 简答题

不符合硅沉着病(矽肺)病变的为()

A.矽结节中央部常发生坏死和钙化

B.胸膜纤维化

C.晚期形成纤维性矽结节

D.早期形成细胞性矽结节

E.肺门淋巴结矽结节形成最早

题型:问答题 简答题

阅读理解。

     If there is no difference in general intelligence (智力) between boys and girls, what can explain

girls' poor performance in science and mathematics?

     It seems to be that their treatment at school is a direct cause. Mathematics and science are seen

as subjects mainly for boys, and therefore, as girls become teenagers, they are less likely to take them.

Interestingly, both boys and girls often regard the subjects for boys as more difficult. Yet it has been

suggested that girls do not take mathematics courses, not because they are difficult, but for social

reasons. Girls do not want to be in open competition with boys because they are afraid to appear less

feminine (女性的) and attractive. However, if we examine the performance of boys and girls who have

taken mathematics courses, there are still more high-achieving boys than there are girls. This difference

appears to be world-wide. Biological explanations have been offered for this, but there are other

explanations too. Perhaps the difference which comes out during the teenage years has its roots in much

earlier experiences. From their first days in kindergarten, boys are enoouraged to work on their own and

to complete tasks. Facts show that outstanding (杰出的) mathematicians and scientists have not had

teachers who supplied answers.

     Besides, there can be little doubt that teachers of mathematics and science expect their boy students

to do better at these subjects than their girl students. They even appear to encourage the difference

between boys and girls. They spend more time with the boy students, giving them more time to answer

questions and working harder to get correct answers from them. They are more likely to call on boys

for answers and to allow them to take the lead in classroom discussion. They also praise boys more

frequently. All of this seems to encourage boys to work harder in science and mathematics and to give

them confidence (信心) that they are able to succeed.

     Such a way of teaching is not likely to encourage girls to take many mathematics and science courses,

nor is it likely to support girls who do. When it comes to these subjects it seems certain that school widens

the difference between boys and girls.

1. Girls are likely to think that _____.

A. science courses are for both boys and girls

B. science courses make them more popular

C. science courses make them successful

D. science courses are difficult for them

2. The text mainly discusses _____ reasons for the difference between boys and girls in scientific

achievements.

A. biological

B. historical

C. social

D. personal

3. What are boys usually encouraged to do at school?

A. To get help with their homework.

B. To play the leading role in class.

C. To work with girl students in class.

D. To learn to take care of others .

4. What does the passage say about great mathematicians?

A. Their teachers did not supply answers to them.

B. They started learning mathematics at an earlier age.

C. They showed mathematical abilities in their teenage years.

D. Their success resulted from their strong interest in mathematics.

5. The author would probably agree that _____.

A. boys and girls learn in the same way

B. boys and girls are equal in general intelligence

C. girls are more confident in themselves than before

D. girls should take fewer science courses than boys

题型:问答题 简答题

苏合香丸的功用是

A.清热开窍,镇惊安神
B.清热化痰,开窍定惊
C.清热开窍,化浊解毒
D.芳香开窍,行气温中
E.化痰开窍,辟秽解毒

题型:问答题 简答题

以下哪款车未采用缸内直喷技术的发动机()。

A.新雅阁

B.新帕萨特

C.新天籁

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