题目内容

数据库完整性和安全性有什么区别。

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下面不属于板料塑性成形方法的是( )

A. 拉拔
B. 轧制
C. 冲裁
D. 挤压

---- Can I help you?---- ______.

A. Yes, please
B. please
C. Yes, you can
D. Yes, as you like

A half day's rent is charged _____ a room not vacated after 12:00 noon.

A. against
B. for
C. to
D. in

At today's exchange rate, every US dollar is equivalent _____ 8:30 yuan RMB.

A. to
B. as
C. in
D. for

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