简述股票发行的目的。

阅读理解。

     One of the most detailed (详细的) descriptions of a UFO was given by nine-year-old Gaynor

Sunderland in July 1976. Gaynor lived in Oakenholt, a village in North Wales. On her way home from

school, she saw a silver(银色的) object shaped like a saucer (茶碟) in a field not far from her home.

     The strange craft (飞行物) was about 30 feet long and 9 feet high. It had yellow windows along the

side and on the top there was a light flashing in a kind of box. Although Gaynor was very frightened, she

did not run away. Instead, she lay quietly in the long grass and watched the door of the strange craft

open. She saw two people wearing silver suits come out of the craft. They were carrying some kind of

equipment(设备) which they used to examine the ground. They were short and had large pink eyes,

Gaynor reported.

     After about half an hour, the two people went back into the craft. At once there was a loud noise

and the UFO took off. 

     Although Gaynor told her mother what she had seen, her family decided to keep quiet about it. They

did not want people to laugh at their daughter. However, 18 months later, Gaynor told her story to

UFO experts. They hypnotized(使人进入睡眠状态) Gaynor so that they could be sure she was telling

the truth.

     Not only did she repeat her story, but also she was able to draw a picture of what she had seen!

1. Which of these descriptions of Gaynor is true?

A. She's nine, lives in a village and has never seen a UFO before.

B. She was nine, and lived in Sunderland in England in 1976.

C. She was nineteen in July 1986, and lived in North Wales as a child.

D. She was at school north of Wales and her family name was Oakenholt.

2. Which of these descriptions of the UFO is true?

A. It was round and flat, and had yellow windows along the side.

B. It was ten feet longer than its breadth, and was silver.

C. It was a saucer-shaped box about thirty feet high.

D. It was a strange silver saucer which was like a craft.

3. What did Gaynor do as soon as she saw the UFO? 

A. She told her mother.

B. She ran away.

C. She went home from school.

D. She hid in the long grass and watched it.

4. Whom did she see come out of the UFO?     

A. Some equipment.

B. Two short, pink-eyed people.

C. Animals.

D. Silver people with equipment.

5. What did Gaynor say when she was hypnotized?     

A. She had been lying about the UFO.

B. She didn't understand the UFO.

C. She told the experts about the UFO.

D. She couldn't speak but she could draw a picture of the UFO.

凸轮轴磨床备有靠模装置，用于磨削各种圆盘凸轮。（设备使用）

在《生产设备与设计—建造合同条件》形式下，一般都是由( )按照业主的要求设计和提供设备或其他工程。

A．发包方
B．承包商
C．设计单位
D．监理单位

承受相同扭矩且长度相等的直径为d₁的实心圆轴与内、外径分别为d₂、D₂ ()的空心圆轴，二者横截面上的最大切应力相等。二者质量之比(w₁/W₂)为（）。

A．A

B．B

C．C

D．D

土地利用总体规划