单项选择题
A user can send e-mail， but cannot receive any e-mail. Which of the following settings should be verified in the e-mail account？（）
A.MAC address
B.TCP/IP address
C.POP Server settings
D.SMTP Server settings
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InWindows2000，whereshouldyougotojoinaworkgroupordomain？（）
A.Device Manager
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WhenmakingaserialconnectionbetweentwoWindows2000machines，whichtypeofcableisneededforpropercommunications？（）
A.RG-59 coaxial cable
B.RS-232 Null Modem cable
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WhichsystemisusedtoresolvenamesontheInternet，suchascomptia.org，toIPaddresses？（）
A.WINS（windows internet name service）
B.HOSTS
C.DNS
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