SELECT COUNT(DISTINCT Sno) FROM SC 语句用于统计学生的总人数。
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()是安装在电梯厅门的信号显示装置。当电梯迫近该层时显示电梯运行的方向。
A. 厅内按钮
B. 厅门电子广告屏
C. 厅门上下行指示
You have a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2).Server1 has a folder named D:\data. The folder is shared as Data.You need to enable users to recover files that are deleted from the Data shared folder.What should you do on Server1? ()
A. From the D volume properties, modify the Shadow Copies settings.
B. From the Sharing and Security settings of D:\data, modify the Caching settings.
C. From the %systemroot%\system32\clients\twclient\x86 folder, install twcli32.msi.
D. From the Services snap-in, modify the startup type of the Volume Shadow Copy Service (VSS).
洛克要求家庭教师是一个通儒。
A. 正确
B. 错误
用离子选择性电极标准加入法进行定量分析时,对加入的标准溶液的要求为()。
A. 浓度高,体积小
B. 浓度低,体积小
C. 体积大,浓度高
D. 体积大,浓度低