大概在唐代中国人已经知道人工磁化和磁偏角，之后造出了可以实用的水罗盘。链接在内

来源: Shubin 于 2025-09-24 14:10:04 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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