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pitlord999
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jim5362(½ð±Ò+6,VIP+0): 10-15 12:05
jim5362(½ð±Ò+6,VIP+0): 10-15 12:05
| Use one twelfth of the molecular weight of carbon 12 atom as a standard, and divide other atoms' molecular weithts by this standard to obtain their relative molecular weight. |
2Â¥2009-10-15 11:03:16
lixiaod001
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3Â¥2009-10-15 12:03:57














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