高中化学：离子方程式过量少量问题（上）
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| MP4 | N/A | 480P | Download |
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| MP4 | N/A | mp4a.40.2 | Download |
| MP4 | N/A | mp4a.40.5 | Download |
| MP4 | N/A | mp4a.40.2 | Download |
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基本上10个同学可能9.5个同学这个问题不会，所以直接用一个例子帮你把这一类问题全干倒！！！！
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