单项选择题
A.系统软件 B.应用软件 C.都不是
A.先开主机再开外设 B.先开外设再开主机 C.一起开
A.NetBios B.TCP/IP C.X.25 D.ADSL
A.Reply from 172.20.1.3: bytes=32 time=31ms TTL=61 B.Reply from 172.20.1.3:TTL expired in transit C.Request timed out D.Destination Host Unreachable
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