题目内容

在卧式列管换热器中,用常压饱和蒸汽对空气进行加热(冷凝液在饱和温度下排出),饱和蒸汽应走(),蒸汽流动方向()。

A. 管程从上到下
B. 壳程从下到上
C. 管程从下到上
D. 壳程从上到下

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You have a computer with a USB keyboard that is running Windows 2000 Professional. You install a USB scanner on this system. The system asks for the driver and you install them. After you restart your computer, you notice that the keyboard doesn’t work anymore. What should you do in order to make both, the keyboard and the scanner work? ()

A. Update the scanner drivers using certified drivers
B. Enable the USB port in the computers BIOS
C. USB keyboards DO NOT exist
D. Enable the USB hub controller
E. Reinstall the USB device driver and disable the USB error detectio

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