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【单选题】
Your network consists of a single Active Directory domain. All servers run Windows Server 2003 ServicePack 2 (SP2). All client computers run Windows XP Professional Service Pack 3 (SP3).Three client computers are public kiosks. All kiosks are configured to automatically log on as a domain user named KioskUser. KioskUser has a roaming profile.Users frequently change the desktop backgrounds on the kiosks.You need to prevent changes to the desktop backgrounds from persisting when the kiosks restart.What should you do? （）A.
In the roaming user profile, rename the ntuser.dat file to ntuser.man.
B.
In the roaming user profile, remove all permissions on the Desktop folder and assign KioskUser the Read permission for the Desktop folder.
C.
On each kiosk, rename the ntuser.ini file to ntuser.man.
D.
On each kiosk, remove all permissions on the Documents and Settings folder and assign KioskUser the Read permission for the Documents and Settings folder.
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【简答题】从文献中得知,A、B两种练习方法对提高学生跳远成绩的有效率分别为35%和65%。现要验证该实验,每组最少需要多少名学生才能判定两种练习方法的差异有显著性?tα=1.96
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