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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 12:16:59[未知IP0801]网友
7.4欧洲杯比赛结果['//soundbridgehr.com/post/32.html', '//lettai.com/jyty/5158.html', '//xjmtaq.com/dq1645.html', '//xcgyyqgwh.com/dq6090.html', '//hxay.cn/dq8784.html']
2024-5-1 12:06:23[未知IP0801]网友
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2024-5-1 11:45:13[未知IP0801]网友
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2024-5-1 11:13:49[未知IP0801]网友
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2024-5-1 10:53:42[未知IP0801]网友
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2024-5-1 10:43:28[未知IP0801]网友
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2024-5-1 10:12:25[未知IP0801]网友
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2024-5-1 9:41:00[未知IP0801]网友
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2024-5-1 9:21:36[未知IP0801]网友
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2024-5-1 9:11:01[未知IP0801]网友
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