问题
问答题 简答题
什么是螺旋桨的几何螺距？什么是螺旋桨的实际螺距？
答案
参考答案：
螺旋桨延桨叶角旋转一周所移动的距离叫几何螺距。螺旋桨旋转一周飞机所前进的距离叫实际螺距。
搜题请搜索小程序“爱下问搜题”
什么是螺旋桨的几何螺距？什么是螺旋桨的实际螺距？
参考答案：
螺旋桨延桨叶角旋转一周所移动的距离叫几何螺距。螺旋桨旋转一周飞机所前进的距离叫实际螺距。
| 完形填空。 | ||||
| I came to study in the US last fall. My life had been 1 since I arrived at Andover. Although I had several outside-class activities, I hadn't taken any official leadership position. This 2 changed when I received an e-mail from Ms Griffith, my cluster (一组, 一群) dean (主任), 3 that a new female DC Rep was needed. DC Rep 4 Discipline Committee Representative. 5 boarding school (寄宿学校) students break serious rules, like using 6 , getting drunk or cheating in their studies. The punishments given to such students are 7 by a DC Rep, a house adviser, two student representatives, the cluster president and the cluster dean. I was interested in becoming a DC Rep for my cluster, Pine Knoll, 8 so were other students. We had to hold an election and Ms Griffith asked us to write 9 to be sent to everyone in Pine Knoll. I thought hard about what to write. I didn't want to make any 10 , because they are difficult to keep. So I started my speech by explaining 11 I wanted to become a DC Rep. "I want to serve Pine Knoll and also learn how American boarding schools carry out discipline," I wrote 12 . I made three 13 that said, "Vote For Teresa" and put them on every exit of my dorm (宿舍) so that people would 14 my name when they went to vote. Although I tried hard, I didn't win the election. I was 15 , but my positive (乐观的) nature did not allow me to 16 for very long. I actually 17 when my friends tried to 18 me, "Teresa, I am sorry." "Don't be sorry for me. I'm very happy to have taken part in the election," I said. It is true that the process is much more important than the 19 . I am surprised and happy to 20 my hidden courage. | ||||
|