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单词 atomic mass unit
释义 atomic mass unit
[ǝ`täm·ik `mas `yü·nǝt]
PHYSICS
An arbitrarily defined unit in terms of which the masses of individual atoms are expressed; the standard is the unit of mass equal to one-twelfth the mass of the carbon atom, having as nucleus the isotope with mass number 12. Abbreviated amu. Also known as dalton.
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