题目内容

进入煤气设施内工作时，CO含量不超过（）时，入内连续工作时间不应超过（）。

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三相异步电动，电源频率f=50HZ，转差率为0.5，磁极对数为4，则其转速为（）m/s。

A. 375
B. 400
C. 470
D. 500

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测定生物大分子的相对分子重量应用最广泛的方法是（）。

A. 差速离心法
B. 沉降速率法
C. 沉降平衡法
D. 速率区带离心法
E. 沉降平衡法

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初步整平仪器是通过调节三个脚螺旋使圆水准器气泡（），从而使仪器的竖轴大致铅垂，视准轴粗略水平。

A. 偏左
B. 居中
C. 偏右
D. 偏上

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You are the network administrator for The network consists of a single Active Directory domain named that contains two domain controllers. The domain controllers run Windows Server 2003 and Certificate Services. Each domain controller has a single mirrored had disk that contains a single NTFS volume. You are responsible for backing up all servers. TestKing requirements state that backups must be performed only between the hours of 1:00 A.M. and 6:00 A.M. All servers share a single backup device. Because a large amount of data must be backed up, you need to complete the required backups as quickly as possible in order to complete the backups within the allotted time. You need to back up Active Directory and Certificate Services on the two domain controllers. The backup must include only the minimum amount of data necessary. Which action or actions should you perform? （）(Choose all that apply)

A. Perform a backup of the System State by using the Backup utility.
B. Perform a shadow copy backup of the C:\Windows\Ntds folder by using the Backup utility.
C. Perform a shadow copy backup of the C:\Windows\Sysvol folder by using the Backup utility.
D. Perform a shadow copy of the C:\Windows\System32\Certsrv folder by using the Backup utility

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