英语词汇“mass number”是什么意思，“mass number”的读音、用法及例句翻译-烛光网

词汇	mass number
释义	mass numbern.（名词） The sum of the number of neutrons and protons in an atomic nucleus. Also called nucleon number 质量数：原子核中质子和中子的总数也作 nucleon number
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