若网络中 IP 地址为 131.55.223.75 的主机的子网掩码为 255.255.224.0;请问该B类地址的子网有多少个?
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参考答案:
举一反三
【简答题】A.Robert survived the plane crash. B.All the passengers were killed in the plane crash. C.Robert was killed in the air crash. D.Robert is a wonder-working person.