單項選擇題在域名系統(tǒng)中，域名采用（）。

A.樹型命名機制
B.星型命名機制
C.層次型命名機制
D.網狀型命名機制


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1.單項選擇題目前在Internet上應用最為廣泛的服務是（）。

A.FTP服務
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C.Telnet服務
D.Gopher服務

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