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【单选题】
●设有4条路由：172.18.129.0/24、172.18.130.0/24、172.18.132.0/24和172.18.133.0/24，如果进行路由汇聚，能覆盖这4条路由的地址是(31) 。 ( 31)A.
172.18.128.0/21
B.
172.18.128.0/22
C.
172.18.130.0/22
D.
172.18.132.0/23
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