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指挥列车运行的命令和口头指示，只能由谁发布？

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双锥面磨擦离合器体的移动距离为1.5―2.5毫米，磨耗后最大为6毫米。

A. 正确
B. 错误

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形状和位置公差带是根据零件的（）和有关（）而规定的偏差允许范围。

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根据世界卫生组织标准，6~14岁小儿贫血的定义是血红蛋白数值低于（）g/L。

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You are the network administrator for All servers run Windows Server 2003. You are creating a backup schedule for the main file server. You need to create a schedule so that backup jobs are completed in the shortest amount of time possible. What should you do?（）

A. Schedule a normal backup every Sunday. Schedule incremental backups every Monday through Saturday.
B. Schedule a normal backup every Sunday. Schedule differential backups every Monday through Saturday.
C. Schedule a copy backup every day.
D. Schedule a normal backup every day.

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