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【单选题】
B类IP地址以（ ）开头，网络地址为（ ）位，主机地址为（ ）位
A.
110 ， 21 ， 8
B.
100 ， 21 ， 8
C.
10 ， 14 ， 16
D.
01 ， 14 ， 16
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