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[光纤光缆] 也谈SDH、MSTP、OTN和PTN的区别和联系(通俗易懂_值得珍藏) |
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发表于 2016-7-12 16:33:29
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doctorlhj
复杂关系简单化,难懂的道理通俗化,博主内功高深啊,佩服佩服!
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