相同强度等级的下列水泥中,三天龄期强度最高的是()。
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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).
根据幼儿期发育特点,谈谈小儿常见营养素缺乏病的原因及预防措施。
创建数据库时若没有指定其文件组,则该数据库不属于任何数据库文件组。
A. 正确
B. 错误
为平衡列车在曲线运行时产生的(),需要在曲线段将外轨抬高,使午体内倾。
A. 向心力
B. 离心力
C. 向心速度
D. 离心速度