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【单选题】
What is the most efficient summarization that R1 can use to advertise its networks to R2（）。
A.
172.1.0.0/22
B.
172.1.0.0/21
C.
172.1.4.0/22
D.
172.1.4.0/24 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24
E.
172.1.4.0/25 172.1.4.128/25 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24
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查看完整题目与答案
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B.
信度和效度完全是可靠的
C.
即使单独使用效果也很好
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该方法操作简便且较为完善
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