题目内容
设有关系Students(学号，姓名，年龄，性别，系名，家庭住址)，其中，属性“系名”是关系DEPT的主键，用户要求访问“家庭住址”的某个成分，如邮编、省、市、街道以及门牌号。关系Students的主键和外键分别是(59)。“家庭住址”是一个(60)属性。
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A(72)consists of the symbols, characters, and usage rules that permit people to communicate with computer.
在Excel中，通过冻结或者拆分窗格可以在滚动工作表时始终保持部分数据可见。下图中(3)，当鼠标指针在上述位置变为(4)后，将该框拖至所需的位置即可。
设有关系Students(学号，姓名，年龄，性别，系名，家庭住址)，如果要查询姓“李”的且家庭住址包含“科技路”的学生学号、姓名以及所在系，则对应的SELECT语句如下：
SELECT学号，姓名，系名
FROM Students
WHERE(61)AND(62)；
听力原文：M: We are having a debate on advertising tomorrow and I have to take part.
W: That's interesting. I should like to hear what young people think about advertising.
M: Well, we wouldn't know what there is to buy if we didn't have advertising.
W: Yes, that's true — up to a point. Advertisements provide information we need. If someone has produced a new article, naturally the seller wants to tell us about it.
M: Yeah, and advertisements tell us which product is the best.
W: Do they？ I don't think so. Every manufacturer says that their product is the best, or at least tries to give us that impression. Only one can be the best, so the others are misleading us, aren't they？
M: Well, in away, I suppose, but we don't have to believe them, do we？
W: Are you saying that advertisements aren't effective？ I don't think that intelligent business people would spend millions of dollars on advertising if nobody believed advertisements, do you？
M: Perhaps not, but after all, it is their money that they are spending.
W: Is it？ Maybe not. The cost of advertising is added to the price of the goods. You and I and all the other people who buy these goods pay for the advertising!
M: OK, I suppose we get something for our money — some information.
W: Yes, but don't forget it is often misleading information, and sometimes harmful.
What is the main subject of the debate？
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