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酚二磺酸光度法测定水中硝酸盐氮，制备硝酸盐氮标准使用液时，应同时制备两份，为什么？

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什么叫灵敏度？

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