问题
单项选择题
SQL的DROP INDEX语句的作用是( )。
A．删除索引
B．建立索引
C．修改索引
D．更新索引
答案
参考答案：D
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SQL的DROP INDEX语句的作用是( )。
A．删除索引
B．建立索引
C．修改索引
D．更新索引
参考答案：D
| 阅读下面短文，掌握其大意，并根据要求完成下列各题。 | |||||||||||||||
| The Music Club The School Music Club needs two people. Read about the four people. How many things can each student do?
| |||||||||||||||
| 1. Ma Lili can play the _______ and the piano,but she can't sing _______ dance. | |||||||||||||||
| A. violin; and B. violin; or C. trumpet; and D. trumpet; or | |||||||||||||||
| 2. Jenny can do _______ things. | |||||||||||||||
| A. one B. two C. three D. four | |||||||||||||||
| 3. Nick can play the _______ and sing, but cant dance. | |||||||||||||||
| A. chess B. trumpet C. guitar D. violin | |||||||||||||||
| 4. Alan can do _______ things. | |||||||||||||||
| A. three B. four C. five D. six | |||||||||||||||
| 5. _______ can join music club. Because they can do more things than the others. | |||||||||||||||
| A. Ma Lili and Nick B. Ma Lili and Jenny C. Jenny and Alan D. Alan and Nick |