问题
填空题
在刚做好的门框架上，工人师傅为了避免门框变形，在矩形的框架上斜钉一根木条，这是利用______原理．
答案
在刚做好的门框架上，工人师傅为了避免门框变形，在矩形的框架上斜钉一根木条，故这种做法根据的是三角形的稳定性．
故答案为：三角形的稳定性．
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在刚做好的门框架上，工人师傅为了避免门框变形，在矩形的框架上斜钉一根木条，这是利用______原理．
在刚做好的门框架上，工人师傅为了避免门框变形，在矩形的框架上斜钉一根木条，故这种做法根据的是三角形的稳定性．
故答案为：三角形的稳定性．
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| Food is everywhere in our lives. There are advertisements for food 1 on TV and in magazines. It's not surprising that many people eat three big 2 a day, and then they have lots of snacks 3 . Doctors say that people 4 eat like pigs. They should eat like birds! It's good for you to have four or five small meals a day. You should eat small amounts of food by taking small bites while eating. It can be 5 for you to eat two or three big meals a day, but these food habits are very 6 to change. Some people never change their eating habits. Other people are 7 to change. When they go to a restaurant, they 8 boiled (煮熟的) fish or chicken, and vegetables. They don't eat a rare steak (牛排) and sour cream. Doctors say that boiled food are good for people. They are better than fried foods. Sometimes, people don't have 9 time to think about food. At lunchtime many people run into a fast-food restaurant for lunch and eat a hamburger and French fries. While they are eating, they drink a soft drink. They can eat up a whole meal in 10 20 minutes. This is good for their daily timetable. But it is not very good for their digestive system or their weight! | ||||
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