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【单选题】
一个中等规模的计算机网络使用一个带有“/21”为后缀的IP地址，在所有的网段中，下面哪个可以当子网掩码（）A.
255.255.254.0
B.
255.255.252.0
C.
255.255.248.0
D.
255.255.240.0
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