Exactly. 燒水可以理解是機械封閉，沒有動能外部輸入，但不是封閉，因為有熱能傳入

來源: 老鍵於 2023-11-24 10:19:20 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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