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jim5362

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Everysteptowardsyourdreamtodayisastepawayfromyourregrettomorrow!
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pitlord999

½ð³æ (СÓÐÃûÆø)

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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
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lixiaod001

½ð³æ (ÕýʽдÊÖ)

The quality of carbon-12 atoms of 1 / 12 as standard, others simply asked to compare the quality of atomic values is derived from the relative atomic mass of this atom,"

Translated into spoken language, especially the 1 / 12 how to use spoken language to express?
3Â¥2009-10-15 12:03:57
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