我国光通信重要突破！全球首条三波段超低损耗多芯光缆线路开通
知识 2026-06-04 00:02:44
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国光https://n.sinaimg.cn/spider20260602/789/w498h291/20260602/d2b8-b482b6662b672693d000a1b17da19b35.png