问题
单项选择题
关系型数据库规范化是为了解决关系型数据库中( )而引入的。
A．减少数据操作的复杂性
B．插入、删除和数据冗余
C．保证数据的完整性
D．提高数据的安全性
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
关系型数据库规范化是为了解决关系型数据库中( )而引入的。
A．减少数据操作的复杂性
B．插入、删除和数据冗余
C．保证数据的完整性
D．提高数据的安全性
参考答案：B
阅读下面短文，将文后的个句子还原到文中适当的位置。 In a class in Japan, a robot teacher Saya called out the names of the students, smiled at them and told them off. 小题1:_________ So the students liked her very much. But the scientists say she is not going to take the place of human teachers. 小题2:__________ They are surprise, fear, dislike, anger, happiness and sadness. She can also say simple phrases such as “Thank you” and “Sorry”. “小题3:__________ Robots that look like humans have an important influence(影响) on children and older people,” said Kobayashi, the maker of Saya. 小题4:___________ After being invented, she was tested in a classroom with many fifth and sixth grade students. “She still can’t do much more than call out names and shout ‘Be quiet’, but the children had great fun,” Kobayashi said. “They were very happy when Saya called out their names. We invented Saya to help people, but we cannot have too high hope for her. 小题5:__________ She is just a tool(工具).”
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