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简述米尔格罗姆和罗伯茨模型。

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学校可以自行发布招生简单和广告。（）

A. 正确
B. 错误

在一个大型TETRA网络中，SwMI通常由（）组成。

A. 众多的基站
B. 固定传输链路、交换设备和数据库
C. 操作维护中心、网关
D. 以上都是

可以使用小型固定压力容器罐体从事道路危险货物运输。

A. 正确
B. 错误

You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named DB1 in the instance. When you are absent, a user will use a login named Mary to log in and maintain the database snapshots. The user has to delete the database snapshots for DB1, so you have to give the appropriate permissions to the user. So which database permission should you give the user?（）

A. DELETE
B. CONTROL
C. DROP DATABASE
D. ALTER ANY DATASPACE