当 A 类网络地址 34.0.0.0 ,使用 8 个二进制位作为子网地址时,它的子网掩码为()
A.255.0.0.0
B.255.255.0.0
C.255.255.255.0
D.255.255.255.255
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正确答案: B 答案分析:无
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