6 9 /10（磁介质需要） 11 12

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![image](https://img2024.cnblogs.com/blog/3image
20260118151018294-1259705683.png)
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保守力做正功 势能减小
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重点：
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posted @ 2026-01-18 22:51  ~shy~  阅读(1)  评论(0)    收藏  举报