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磁铁是如何制造的？20多年的疑惑终于被解开了
2026-04-14
网络整理
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Key Point:磁铁，在我们小时候就记忆很深，它是个神奇的东西。下课了在教室里玩的磁铁大战，两个磁力战士各拿一块磁铁，中线两侧同时放好，等裁判一声令下双方同时放手，越界的磁铁算输会被拿走
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2026-04-14
网络整理佚名1190
