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接触网作业人员进行隔离开关、负荷开关倒闸时，必须有（）的命令。

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发动机冷车机油压力正常，温度正常后，机油压力低的原因是（）。

A. 机油泵泵油量
B. 缺少机油
C. 机油黏温性不好
D. 管道漏

You are a network administrator for ExamSheet.net’s Windows 2000 network. Your computer has Windows 2000 Professional installed. Your office has a power utage while you are running the Windows 2000 disk defragmenter. When you restart your computer， you receive the following error message： "Bad or missing operating system". You want your computer to start properly. You want to do this with least amount of administrative effort. What should you do？（）

A. Reinstall the operating system
B. Start the computer by using the Windows 2000 Professional CD-RO
C. Use the Recovery Console to repair the Master Boot Record.
D. Use the Emergency Repair Disk to repair the Master Boot Record.

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定期保养是叉车在使用一定时间后所进行的工作，分为一级保养和（）保养。

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对于一个正常品来说，它的替代品价格上涨时，它的需求曲线回向右上方移动。

A. 正确
B. 错误

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