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单词 θ79347
释义
the world > matter > physics > atomic physics > [noun] > atomic mass > unit of (2)
mass unit1942

= atomic mass unit n. at atomic mass, n. compounds.

atomic mass unit1954

a unit used for expressing atomic masses, formerly equal to 1/16 of the average mass of an atom of oxygen, or of the precise mass of an atom of the…

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