题目内容：
A.20B.21
C.22
D.23
参考答案：
选择题：Whichofthefollowingisthedefaultportfortelnet?()
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Which of the following cables is normally associated with a DB－15 connector?()
Which of the following cables is normally associated with a DB－15 connector?()
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Giventhefollowingroutingtableentries,whichofthefollowingwillthenext－hopaddressbeforapacketdestinedfortheaddress192.168.1.203?()
Giventhefollowingroutingtableentries,whichofthefollowingwillthenext－hopaddressbeforapacketdestinedfortheaddress192.168.1.203?()
办理机场控制区通行证人员,必须符合哪些要求?
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