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在计算机系统的层次结构中，用户位于第几层？

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根据信产部《移动通信工程钢塔桅结构设计规范》规定，钢塔桅结构塔脚件直径最小规格不小于（）mm。

A. 12
B. 14
C. 16
D. 18

Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 (SP2). The domain contains two domain controllers named DC1 and DC2. DC1 is located in Montreal and DC2 is located in Seattle. Each domain controller has a dedicated hard disk that contains only the Active Directory database and log files. Each night, you back up the system state on all domain controllers. On DC2, the hard disk that contains Active Directory fails. You replace the failed hard disk on DC2. You need to restore domain controller functionality on DC2. The solution must minimize replication traffic between Montreal and Seattle. What should you do on DC2? （）

A. Uninstall Active Directory and then reinstall ActiveDirectory.
B. Start by using the Last Known Good Configuration.
C. Start in Directory Services Restore Mode and restore the NTDdit file.
D. Start in Directory Services Restore Mode and restore the system state.

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“左”倾冒险主义是主观什么于客观？

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热车起动困难主要的原因是（）。

A. 供油不足
B. 火花塞有故障
C. 点火过早
D. 混合气过浓

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