单项选择题
Which of the following switches in Windows can be used to ping a host until stopped?（）
A.-l
B.-a
C.-t
D.-f
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A.127.0.0.1
B.172.31.146.1
C.192.168.1.1
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Which of the following is a graphical enhancement in Windows Vista?（）
A.UAC
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A support technician wants to help a user, in a different city, navigate a new software program. Which of the following will allow the user and technician to view and control the Windows XP PC desktop simultaneously?（）
A. Terminal Services
B. Remote Assistance
C. Routing and Remote Access Service
D. Remote Desktop
