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问题 单项选择题

数据维护中，下列操作不属于整理数据的是( )

A．重建数据库的索引文件
B．对逻辑删除的数据进行物理删除
C．删除临时文件
D．恢复需使用数据

答案

参考答案：D

完形填空

Peter likes playing in a river .But there ___1__ a river near his new house .He is not very ____2___. One day ,he asks his mother ,“___3___ a river near here ?”“No, there isn’t ___4___,”his mother says ,“but our new house has a garden .”“I don’t like it,”says Peter .

One morning his mother says ,“There is a beautiful park near here ,Peter ,and there are two pools（水池）in it .We’ll go there this afternoon .”Peter is very happy .

After lunch, Peter and his mother ___5___the park, and he plays in one of the pools .He has a very good time.

小题1:  

A．isn’t

B．is

C．aren’t

D．are小题2:  

A．cheap

B．busy

C．happy

D．cold小题3:  

A．There is

B．Are there

C．There are

D．Is there小题4:  

A．some

B．one

C．two

D．no小题5:  

A．go to

B．comes to

C．go

D．come
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单项选择题

下面单位表示应力单位的是（）。

A.N/m

B.N/m3

C.N/mm2
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