事故抢修和遇有危及人身或设备安全的紧急情况，作业时必须开工作票，但必须有电力调度命令及批准时间。
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在演示前介绍媒体时，在引导学生观察前，要向学生介绍所使用媒体的特点或结构、组成。如生物根、茎、叶的挂图，是外部形态还是内部结构；内部结构是横切还是纵切；放大（缩小）的倍数及其表示色等。
A. 正确
B. 错误
You want to upgrade 400 computers from Windows 95 to Windows 2000 Professional. Most of the computers in your company use the same hardware. However， several different peripheral devices are used throughout the company. You want to verify that the hardware in use is compatible to Windows 2000 Professional. You want to accomplish this with least amount of administrative effort. What should you do？（）
A. Create several different computer configurations. Install Windows 2000 Professional and enable driver signing.
B. Create a bootable floppy disk that contains and automatically runs winNT32.exe/checkupgradeOnlySend the floppy disk to each user on the network.
Copy the contents of Windows 2000 Professional CD-ROM to a network share. From the network， modify your network logon scripts to run WinNT32.exe/Unattended：ReportOnly.
D. Use setup manager to create a setup.inf file. Add the entry ReportOnly=Yes to the [Win9xUpg] section of the answer file. Run Winnt32.exe/unattended.setup.inf on all of the different computer configurations.
三螺杆泵可适用的系统是（）。
A. 污水系统
B. 污油系统
C. 润滑系统
D. 空气系统
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