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to phrases
agric. [原子]质量数
chem. 〔原子〕质量数
earth.sc. 质量〔数〕; 原子 质量数
phys. 核子数; 质量数
mass number: 8 phrases in 6 subjects
Agriculture1
Chemistry1
Oil / petroleum1
Oil processing plants1
Polymers1
Technology3