单项选择题

Which of the following commands changes a file characteristic so that it cannot be seen with astandard directory query? （）

A. attrib file.txt +h
B. attrib file.txt +r
C. ren file.txt
D. attrib file.txt +s

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Which of the following attributes is set when a file is ready to be backed up?（）

A.a
B.h
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Which of the following Windows versions includes Windows Defender, by default?（）

A. Windows Vista Home Premium
B. Windows 2000 Professional
C. Windows XP Pro
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A technician is trying to install a previous-generation expansion card into their new laptop.However, the card refuses to fit into the expansion slot. Which of the following is MOST likely the reason?（）

A. The card needs to have the compatibility jumpers set before it can be installed into the system.
B. The card is a PCI Express card and the laptop supports pcmica.
C. The expansion slot needs to be enabled in the blos first.
D. The card is a PCMCIA card and the laptop supports PCI Express cards.