问题 问答题 简答题

怎样防止井塌?

答案

参考答案:

预防井塌的措施有:

使用低失水、高矿化度和适当粘度的防塌泥浆;在钻进破碎性地层时,要适当增大泥浆的密度;起钻时要连续灌泥浆,避免钻头泥包,防止因抽吸作用而引起井塌。

阅读理解

阅读理解。

     An Indian farmer took his old elephant to the market. When he arrived, he saw a stranger walking

around the animal. The stranger watched it carefully and did not say anything. The man was afraid that

the stranger and found that the elephant didn't cost so much, so he took the stranger a side and said, "If

someone comes to buy the elephant, say nothing till I sell it, and I will give you fifty rupees (卢比)."The

stranger looked at the farmer and didn't say anything.

     A few minutes later, a rich man came, he bought the poor elephant and took it away. The farmer gave

the stranger fifty rupees, and asked him how he found out the defect (缺陷) in the left leg of the elephant.

The stranger said he found nothing. He just want to know which was the head and which was the tail, for

he had never seen an elephant before.

1. Why did the farmer want to sell the elephant?

A. Because the elephant didn't have its left leg.

B. Because there was something wrong with its head.

C. Because he wanted to be a business.

D. Because of the defect in the left leg of the elephant.

2. Why did the stranger watch the elephant carefully?

A. Because he couldn't find its leg.

B. Because he had never seen an elephant before.

C. Because he wanted to find out the defect.

D. Because he wanted to buy it.

3. How much did the stranger thought the elephant cost?

A. Fifty rupees.

B. Not very much.

C. Less than fifty rupees.

D. He had no idea about it.

4. What did the Indian farmer ask the stranger to do?

A. Not to stand there.

B. To go away.

C. To stop watching the elephant.

D. To say nothing until he sold the elephant.

5. Who is cleverer, the Indian farmer or the stranger?

A. The Indian farmer.

B. The stranger.

C. Both of them.

D. Neither of them.

单项选择题 A1/A2型题