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單項選擇題

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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單項選擇題

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

A.a
B.h
C.r
D.s

多項選擇題

Which of the following Windows versions includes Windows Defender, by default?（）

A. Windows Vista Home Premium
B. Windows 2000 Professional
C. Windows XP Pro
D. Windows XP Pro x64
E. Windows Vista Pro

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