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改扩建工程，在运行区内作业，开工前应做哪些准备工作（区别新建工程）？

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如何保障生活饮用水的安全卫生？

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食品中亚硝酸盐的测定标准：GB.5009.33-2010，中国标准分类的大类字母应是（）。

C. X
D. Z

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相同强度等级的下列水泥中，三天龄期强度最高的是（）。

A. S
B. O
C. P
D. F

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You are the administrator of your company's network. You install 220 new Windows 2000 Professional computers in the Sales department. Two weeks later users report that five of the computers have stopped responding. You troubleshoot the five computers and find that the users have attached USB devices and have installed device drivers that are not supported by Windows 2000 Professional. You want to ensure that it does not happen again. You decide to configure the computer to install device drivers only for the devices that are included on the current hardware compatibility list (HCL). What should you do?（）

A. Use NTFS permission to restrict users access to the C：\WinNT\driver cache folder.
B. Use NTFS permission to restrict users access to the C：\WinNT\system32\drivers folder.
Configure Windows 2000 Professional to enable driver signing verification.
D. Configure Windows 2000 Professional to trust the Microsoft certificate authority （CA）.

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