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X.25建议将数据网的通信功能划分为( )个相互独立的层次。
分类: 通信专业业务
发布时间: 2023-11-19 11:55
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X.25建议将数据网的通信功能划分为( )个相互独立的层次。
A.A、1
B.B、2
C.C、3
D.D、4
正确答案是C
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