铁氧体（ferrite）磁铁作为替代还在研究中.美国人日子好过没忧患意识,等那天发老急会快马加鞭一下子搞出来的.

来源: 5181 于 2025-10-13 14:55:52 [旧帖] [给我悄悄话] 本文已被阅读：次

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