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  <title id="title">单线、双线、多线与BGP接入结构对比图</title>
  <desc id="desc">展示IDC网络接入中单线、双线、多线和BGP的接入结构差异。</desc>
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    <text x="270" y="615" text-anchor="middle" font-size="20">一种运营商</text>

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