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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（）。
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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。
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)
使用钳形电流表测量高压电缆线路的电流时，应设专人监护，钳形电流表与高压裸露部分的最小允许距离为700mm时，电压等级为（）
检修人员进入煤气设备内部工作时，必须检测一氧化碳浓度，合格后方可作业，并对含量不断监视。在设备内部的操作时间要根据一氧化碳含量不同而确定，而氧含量接近对比环境中的氧含量时才能进入。
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