问题
填空题
在数据库系统的三级模式体系结构中， 描述数据在数据库中的物理结构或存储方式的是 【9】 。
答案
参考答案：内模式
解析： 数据库系统的三级模式体系结构指外模式、模式和内模式：外模式是批数据的局部逻辑结构，模式是指数据的全局逻辑结构，内模式是指数据的存储结构(物理结构)。
搜题请搜索小程序“爱下问搜题”
在数据库系统的三级模式体系结构中， 描述数据在数据库中的物理结构或存储方式的是 【9】 。
参考答案：内模式
解析： 数据库系统的三级模式体系结构指外模式、模式和内模式：外模式是批数据的局部逻辑结构，模式是指数据的全局逻辑结构，内模式是指数据的存储结构(物理结构)。
Are the lives of city kids the same as those in villages? In lots of ways, they are very different. But what are the differences? Hu Peng and his four friends decided to find them out. Earlier this month, they went to live for a week at Huagui Village near Xishui. They went door to door there and asked kids there lots of questions. They wanted to learn more about village kids’ everyday lives, so they asked questions like these: Do your parents teach you how to do housework? How much money do you usually spend on dinner? What would you do if a thief comes into your houses? They also asked 150 city kids the same question. On April 12, the team gave a report to their class. They told about lots of differences between children’s lives in cities and those in villages. The biggest difference is independence. Hu’s team say that more than 60 percent of city kids can’t do much housework, but more than 80 percent of village kids can care for themselves. City kids told Hu they cared about school a lot, and they had no time to wash clothes or make their beds. Village kids said they helped their parents with a lot: they cook, clean houses and feed farm animals, Hu’s team also saw that village kids had less pocket money. Many never use computers. They play in rivers or on mountains. Some don’t really like to make new friends. Hu’s team said their trip gave them more self-confidence(自信心) because they were doing something by them-selves. But it also worried them a bit because they saw they still had a lot to learn. “When we grow up, our parents can’t take care of us,” Hu said. “We have to learn to take care of ourselves. ” 请根据短文内容完成下表信息：
|