中文说明：2_光传送网和分组传送网的网络规划设计
English Description：
2_ Network planning and design of optical transport network and packet transport network
2_ Network planning and design of optical transport network and packet transport network
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中文说明：2_光传送网和分组传送网的网络规划设计
English Description：
2_ Network planning and design of optical transport network and packet transport network2_光传送网和分组传送网的网络规划设计.caj