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什么叫灵敏度？

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简述超焦距与光圈口径的关系。

Cer-tech .com has a server that runs Windows Server 2008. A Web Server （IIS） server role is installed onthe server. The server hosts a website that is configured to use only Windows Authentication. The companyhas a security group named EG1 which contains 50 user accounts. You need to prevent this group fromaccessing the website while allowing all other to access the website. Which website feature should youconfigure to achieve this task？（）

A. Group Access Policy
B. Authorization Rules
C. IIS group permissions
D. SSL certificates
E. None of the above

各单位信息中心应设立网络运行管理专责工程师岗位，具体负责网络的日常运行与维护管理。

A. 正确
B. 错误

首次提出把新医药和健康养生业作为大数据产业姊妹篇来抓的领导人是（）

A. 赵克志
B. 陈敏尔
C. 陈明鸣
D. 何力