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【单选题】
网络系统分层设计的另一个好处是可以方便地分配与规划带宽，有利于均衡负荷，提高网络效率。经验数据是：层次之间的上联带宽与下联带宽之比一般控制在( )。A.
1:10
B.
1:20
C.
1:30
D.
1:40
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皮皮学刷刷变学霸
举一反三
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