单项选择题
A.RJ-11B.RJ-45C.RJ-23D.RJ-46
A.IEEE802.3B.IEEE802.11C.IEEE802.8D.IEEE802.12
A.32B.48C.64D.128
A.10.0.0.0-10.255.255.255B.172.16.0.0-172.31.255.255C.192.168.0.0-192.168.255.255D.202.34.0.0-235.168.255.255
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