单项选择题
A.Satellite B.Cable C.DSL D.Dial-up
Which of the following commands changes a file characte...
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
Which of the following attributes is set when a file is...
单项选择题Which of the following attributes is set when a file is ready to be backed up?（）
A.a B.h C.r D.s
Which of the following Windows versions includes Window...
多项选择题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
