问题 单项选择题

石质路堑施工的开挖方式中,( )是将膨胀剂放入炮孔内,利用产生的膨胀力缓慢地作用于孔壁,经过数小时至24h达到300~500MPa的压力,使介质裂开。

A.直接应用机械开挖
B.混合式开挖
C.钻爆开挖
D.静态破碎法

答案

参考答案:D

解析: 静态破碎法:将膨胀剂放入炮孔内,利用产生的膨胀力.缓慢的作用于孔壁,经过数小时至24h达到300~500MPa的压力,使介质裂开。

阅读理解

阅读理解。

     In 1608 an Englishman named Thomas Coryate visited Italy. He liked the country and wrote down

every interesting thing he found. But there was one thing which he found the most interesting. In his diary

Thomas wrote, "When the Italians eat meat, they use small forks. They do not eat with their hands,

because people do not always have clean hands."

     Before leaving for England, Thomas Coryate bought a few forks.

     At home Thomas had a dinner party to show the invention to his friends. When the steak (牛排) was

brought out, he took out a fork and began to eat as they did in Italy.

     Everybody looked at him in surprise. When he told his friends what the fork was, they all wanted to

take a good look at the strange thing. All his friends said that the Italians were very strange people

because the fork was not easy to use at all.

     Thomas Coryate tried to prove (证明) that his friends were wrong. He said it was not nice to eat

meat with one's fingers because they were not always clean.

     Everybody got angry at that. Did Mr. Coryate think that people in England always had dirty hands?

And weren't the ten fingers we had enough for us?

     Thomas Coryate wanted to show that it was very easy to use the fork. But the first piece of meat he

took with the fork fell to the floor. His friends began to laugh and he had to take the fork away.

     People in England began to use forks only fifty years later.

1. Why did Thomas Coryate bring forks to England?

A. He wanted to surprise his friends.

B. He believed that it was not nice to eat meat with fingers.

C. Forks were beautiful.

D. He wanted to make business selling forks.

2. Why did everybody look at Thomas when he began to eat like the Italians?

A. They believed that was bad manners.

B. Nobody ate meat with hands in England.

C. Everybody thought it was an amazing invention.

D. Nobody had seen a fork before.

3. People were _____ when Thomas said that they shouldn't eat meat with their fingers.

A. unhappy

B. sorry

C. sad

D. worried

4. The first piece of meat fell to the floor when Thomas took it with the fork because _____.

A. the fork was very difficult to use

B. the fork was bad

C. Thomas could not use it quite well

D. the steak was too hard

名词解释