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目前国内大部分电力专网都已建有SDH光环网，它具有自愈环功能，当一端光纤线路中断了还可以从另外一端将数据传输过去。但并不是每一个SDH设备都处于环网里，就好比一些省市地域广阔，电力通信线路比较长，某一些变电站形成自愈环比较困难，不但投资大，需要的光缆资源多，…
2024-5-1 2:25:08[未知IP0801]网友
欧洲杯 球场开放时间冬季['//yjzscl.com/post/1287.html', '//lovecookware.com/ob9136.html', '//wlytf.com/df9966.html', '//borehome.com/dq7834.html', '//spbzp.com/dq5770.html']
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2024-5-1 1:23:02[未知IP0801]网友
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2024-5-1 1:02:55[未知IP0801]网友
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2024-4-30 23:50:34[未知IP0801]网友
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