问题
单项选择题
关系数据库逻辑上是由 (223) 构成的。当查询一个数据库视图时，就是从 (224) 中导出数据。支持数据库各种操作的软件系统叫做 (225) 。
A．视图
B．程序
C．表
D．文件
答案
参考答案：C
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关系数据库逻辑上是由 (223) 构成的。当查询一个数据库视图时，就是从 (224) 中导出数据。支持数据库各种操作的软件系统叫做 (225) 。
A．视图
B．程序
C．表
D．文件
参考答案：C
| 阅读表达。 | ||||||
| Now TV programs play an important part in our daily life.We can get a lot of knowledge and a lot of fun from it.Today is Saturday.The following are some TV programs and different channels today.Now read these TV programs and try to find some information for yourself and your family members.
2. My father is a ________fan.He prefers football matches.He can watch SXTV Channel 7. 3. My mother likes watching TV plays.She wants to watch ________in the afternoon. 4. My sister is only six years old.I want to find a program for her.I think she can watch________. 5. I am a student.I like music,but I am very busy tonight.So I can watch________ this evening. |