单选题:IP地址块202.192.33.160/28的子网掩码可写为(  )。

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题目内容:
IP地址块202.192.33.160/28的子网掩码可写为(  )。 A.255.255.255.192
B.255.255.255.224
C.255.255.255.240
D.255.255.255.248

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