问题 问答题 简答题

简述XY—4型钻机的结构特点。

答案

参考答案:(1)立轴转速高,调速范围广。

(2)钻机重量轻,解体性能好,最大部件重量218kg,便于搬迁维修。

(3)结构简单,布局合理,操纵灵活。

(4)机架牢固,重心低,高速运转平稳。

(5)立轴行程长,利于提高钻进效率。

选择题
阅读理解

On April 1st, Mike decided to fool(愚弄) his friends.

At lunch time he said to Tom, “I think we’re going to have a test this afternoon.” “Test?” said Tom, “Really?”

“Yes, it’s quite true,” said Mike. “When I was passing by Mr. Green’s room, he was talking with another teacher about the test. Tell John, Rose and Joan about it.”

Later Tom told them about the test. Soon almost all the students knew about it. “How foolish they are!” he thought.

When class began, Mr. Green said, “Class, we’re going to have a test today.” Mike was surprised. The test was too hard for him. After class, all his classmates thanked him very much. But he could only smile. “How foolish I was !”he thought.

It really was April Fools’ Day for Mike.

小题1:Mike decided to fool his friends because ________ .

A.they were talking about the test

B.they began to prepare (准备) their lessons

C.it was April Fools’ Day

D.they were foolish小题2:________ his classmates believe (相信) him before class.

A.Almost all

B.None of

C.Only a few

D.Some of小题3:Mike didn’t prepare his lessons because _______

A.he didn’t like to

B.it was his holiday

C.he thought the test was easy for him

D.he believed there wasn’t going to be a test小题4:Mike was surprised to see ________ .

A.the test was too hard for him

B.the teacher really gave them a test

C.Tom didn’t believe him

D.his classmates were so foolish小题5:Which of the following is wrong?

A.Mike thought he himself was foolish.

B.All his classmates thanked him.

C.Mr. Green was talking with another teacher about the test.

D.Nearly everyone knew the test before long(不久).