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引风机启动前检查内容有哪些？风机启动时，让你留在就地的目的和要求是什么？

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液态碳氢化合物的动力黏度随温度的上升而（）

A. 增大
B. 不变
C. 减小
D. 急剧减小

You are the network administrator for All network servers run Windows Server 2003. A member server named TestKingA contains two volumes. You need to perform a complete backup of the data on TestKingA. You must ensure that TestKingA can be completely restored in case of hardware failure. Which two actions should you perform? （）(Each correct answer presents part of the solution. Choose two)

A. Create an Automated System Recovery (ASR) backup.
B. Create a backup of user data.
Create a Windows Server 2003 bootable floppy disk.
D. Create a DOS bootable floppy disk.
E. Copy all Windows Server 2003 boot files to the Windows Server 2003 bootable floppy disk.
F. Copy only Boot.ini to the Windows Server 2003 bootable floppy disk

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植物病程

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在帧中继中需要CRC，是因为（）

A. CRC有助于检测连接失败
B. CRC有助于防止拥塞
CRC确保传输速度
D. CRC确保帧的准确性

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