![](https://i.imgur.com/pQA8rJY.jpg)
[問題] 請教化學
![](https://i.imgur.com/pQA8rJY.jpg)
不懂3是哪來的耶
來自引航單冊
希望大家可以幫我節惑
謝謝!
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07/16 16:28, , 1F
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07/16 16:36, , 3F
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噓
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07/16 17:18, , 5F
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07/16 17:18, , 6F
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