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常见化学元素的平均原子质量 Average atomic mass of common chemical elements
请尝试写出化学中较常见元素的平均原子质量（一般四舍五入到个位，特殊情况常视为以.5结尾的以浅黄色底标出）
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Last updated: September 14, 2025
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| First submitted | September 13, 2025 |
| Times taken | 15 |
| Average score | 85.0% | Report this quiz | Report |
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