设冷、热流体的进、出口温度不变，仅改变其流动方式，则它们的对数平均温差最大应是(

阅读理解。

     The year was 1932. Amelia Earhart was flying alone from North America to England in a small single-

engined aeroplane. At midnight, several hours after she had left Newfoundland, she ran into bad weather.

To make things worse, her altimeter (高度表) failed and she didn't know how high she was flying. At night,

and in a storm, a pilot is in great difficulty without an altimeter. At times, her plane nearly plunged (冲) into

the sea.

     Just before dawn, there was further trouble. Amelia noticed flames (火焰) coming from the engine.

Would she be able to reach land? There was nothing to do except keep going and hope.

     In the end, Amelia Earhart did reach Ireland, and for the courage she had shown, she was warmly

welcomed in England and Europe. When she returned to the United States, she was honored by President

Hoover at a special dinner in the White House. From that time on, Amelia Earhart was famous.

     What was so important about her flight? Amelia Earhart was the first woman to fly the Atlantic Ocean

alone, and she had set a record of fourteen hours and fifty-six minutes.

     In the years that followed, Amelia Earhart made several flights across the United States, and on each

occasion she set a new record for flying time. Amelia Earhart made these flights to show that women had

a place in aviation (航空) and that air travel was useful.

1. Which of the following statements is NOT the difficulty which Amelia Earhart met in her flight from north

     America to England? [ ]

A. She was caught in a storm.

B. The altimeter went out of order.

C. Her engine went wrong.

D. She lost her direction.

2. When Amelia Earhart saw flames coming from the engine, what did she do? [ ]

A. She did nothing but pray for herself.

B. She changed her direction and landed in Ireland.

C. She continued flying.

D. She lost hope of reaching land.

3. According to the passage, what was Amelia Earhart's reason for making her flights? [ ]

A. To set a new record for flying time.

B. To be the first woman to fly around the world.

C. To show that aviation was not just for men.

D. To become famous in the world.

4. Which of the following would be the best title for the passage? [ ]

A. Amelia Earhart-First Across the Atlantic.

B. Amelia Earhart-Pioneer in Women's Aviation.

C. A New Record for Flying Time.

D. A Dangerous Flight from North America to England.

晓聪同学采用如图所示的方法测定硬币的直径，所使用的刻度尺的分度值是______，则硬币的直径D=______cm．

一个学生可以选不同课程，很多学生可以选同一门课程，则课程与学生这两个实体之间的联系是 ______。

A．一对一联系

B．一对二联系

C．多对多联系

D．一对多联系

请在“答题”菜单中选择相应的命令，并按照题目要求完成下面的操作。

注意：以下的文件必须保存在考生文件夹下。

某高校计算机系举办了一场“我爱我的祖国”的活动，活动结束后，由负责宣传的同学将本次活动的相关内容制作成简报，并分别抄报、抄发给相关院系部门。

请按如下要求，完成活动简报的制作：

根据“Word-简报参考样式.docx”文件，调整邀请函中内容文字的字体、字号和颜色。

调压阀组两个作用：一是调压，二是（）。