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containing
unified scale
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in specified order only
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unit of
unified scale
统一标度原子质量单位
规定碳同位素 C12 的质量为 12.000amu，由而使 1 amu = 1.6600 x 10-24克; 系 IUPAP 和IUPAC 于1960年前后共同拟订
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