问题
单项选择题
对于变截面轴来说，危险应力产生在（）截面上。
A.扭矩为最大的截面上
B.面积为最小的截面上
C.面积为最大的截面上
D.剪应力最大的截面上
答案
参考答案：D
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对于变截面轴来说，危险应力产生在（）截面上。
A.扭矩为最大的截面上
B.面积为最小的截面上
C.面积为最大的截面上
D.剪应力最大的截面上
参考答案：D
| 完形填空。 | ||||
| Bessic Coleman was born in the USA. Her family was 1 . She was in college for only one year. She had to 2 because she did not have enough money to finish her studies. But during that year, she learned about 3 . She read about the first flight of the Wright Brothers and the first American woman pilot, Harriet Quimby. Bessie often thought about what it would feel like to fly like a bird. 4 the age of 23, Bessic Coleman went to Chicago. There, she did some ordinary (普通的) jobs. But she wanted to do something more important. She decided to learn 5 to fly planes. She soon found 6 was almost impossible to get into a flight school. Which flight school would admit (接受) a 7 woman? Bessic learned that she would have a better chance in Europe. So she began to study 8 at a language school in Chicago. After World War I, Bessie Coleman went to France. She went to the famous 9 school in northern France.She learned to fly in a plane there. She 10 seven months of flight training and in 1921 got her international permit (许可证) to fly in France. She became the first black woman ever to have an international pilot's license (执照). | ||||
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