题目内容
身份验证是SQL Server系统标识用户或进程的过程，客户自身必须通过服务器的身份验证后才可以请求其他资源。授权是授予通过身份验证的用户或进程以访问或修改资源的指定权限的过程。
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SQL Server 2008中的主体对安全对象的权限层次分4层。
complete the sentences with NO MORE THAN THREE words from para.3-6.When the secondary __________ spins to 90 degrees from north, the signal is 90 degrees out of _______________ of the master signal.
The VOR display in the aircraft cockpi shows the _______________ and can be used as a _____________ for navigation.
The line of pistion transmitted by the VOR ground sation and displayed in the cockpit is called a ______________.
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