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单词 atomic mass unit
释义 atomic mass unit
 Physics.
  1. Also called dalton. a unit of mass, equal to 1/12 the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles.
  2. (formerly) a unit of mass, equal to 1/16 the mass of an oxygen atom having atomic mass 16. Abbr.: amu, AMU
 [1950-55]
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