一种元素中原子的平均重量,通常相对碳2的重量来表示,碳2的重量定为十二个原子量单位。
The average mass of an atom of an element, usually expressed relative to the mass of carbon 2, which is assigned 2 atomic mass units.
一种元素中原子的平均重量,通常相对碳12的重量来表示,碳12的重量定为十二个原子量单位。
The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which is assigned 12 atomic mass units.
应用推荐