问题 单项选择题

箱体零件孔与孔之间、孔与平面之间以及平面与平面之间都有较高的尺寸精度和相互位置精度要求。而这些要求的保证,与()的选择有很大关系。

A.粗基准

B.精基准

C.加工基准

D.定位基准

答案

参考答案:B

阅读理解

阅读理解。

     Sick men and women were sitting on their chairs in the doctor's waiting room. They all looked sad

except Tom. He was playing with some cards. Just then the doctor came to say he was ready for the

next one. Tom jumped up and entered the doctor's room in a hurry.

     Before Tom could say a word, the doctor made him lie down on the bed."Now let me listen to your

heart." Tom tired to speak, but the doctor told him not to say anything. "I'll take your temperature." Tom

tried to sit up, but the doctor stopped him. After a while, the doctor said, "Well, you don't have a fever

(发烧), boy. In fact, there's nothing wrong with you.""I'm quite well, doctor." Tom said."I just came here

to get some medicine for my grandma."

1. In the doctor's waiting room Tom _______.

A. looked sad

B. was playing with some cards

C. was talking with others

D. was very happy

2. Before the doctor listened to Tom's heart, he _______.

A. asked Tom how old he was

B. asked Tom to sit down

C. made Tom lie down on the bed

D. talked with Tom for a few minutes.

3. The doctor thought _______.

A. Tom had a fever

B. there's something wrong with Tom

C. there's something wrong with Tom's heart

D. nothing is wrong with Tom

4. Tom came to the doctor's room because he _______.

A. was ill

B. wanted to see the doctor

C. wanted to get some medicine for his grandma

D. had a fever

5. Which is right?

A. Tom played with some cards in the doctor's room.

B. The doctor told Tom to enter his room quickly.

C. The doctor looked over Tom's grandma.

D. Tom's grandma needed some medicine.

选择题