The following article takes the former as its topic to explore the economic convergence effect and outward radiation function of Chenddu metropolitan circle.
前一个标志正是本文研究的主题，旨在探讨成都都市圈的经济集聚效应及其对外辐射的外向型功能。
SHAONET, the first WDM all optical network testbed in China, is a metropolitan self-healing ring. A novel OADM having protection function is adopted.
SHAONET是国内自主开发的第一个WDM全光试验网平台，它采用了一种新型保护结构的OADM，具有很强的自愈功能。
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