您要查找的是不是：
- neutron atomic mass 中子原子质量
- A type of atom specified by its atomic number, atomic mass, and energy state, such as carbon 14. 核种由它的原子序数、原子量和能量状况具体确定的一种原子，如碳14。
- Early chemists had to use indirect means for determining the atomic mass of an element. 早先的化学家只得用间接的方法来确定某种元素的原子质量。
- A type of atom specified by its atomic number,atomic mass,and energy state,such as carbon14. 核种由它的原子序数、原子量和能量状况具体确定的一种原子，如碳14
- Any of two or more kinds of atoms having the same atomic mass but different atomic numbers. 同量异位素两种或各多种有相同原子质量但却有不同的原子序数的原子中的任一种
- A type of atom specified by its atomic number, atomic mass, and energy state, such as carbon14. 核种由它的原子序数、原子量和能量状况具体确定的一种原子,如碳14。
- Of or relating to an isotope with an atomic mass greater than the average mass of that element. 重的原子质量比该元素的平均原子质量重的同位素的或与之有关的
- Early chemists had to use indirect means for determining the atomic mass of an element . 早先的化学家只得用间接的方法来确定某种元素的原子质量。
- You can plot data for a range of elements for properties like the density or the atomic mass. 你也可以使用一定范围内元素的密度、原子质量等元素性质来构建图表。
- Since 1998 Archimedes Technology Group in San Diego has been developing a filtering method that works via atomic mass rather than chemical properties. 自1998年以来，位于加州圣地牙哥的阿基米德技术公司已经发展了一个过滤法，利用的是原子量而不是化学性质。
- Analysis results of solubilizing products indicated that the ash decreased obviously,H/C and N/C atom mass rate increased. 微生物溶煤产物的工业分析、元素分析结果表明,煤溶物的灰分明显下降,H/C、N/C原子质量比增大;
- A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens. 碳4：一种碳的天然放射性同位素，原子量为4，半衰期为5,780年，用于测定古代生物标本，地质标本或考古遗迹的标本的年代
- Precision values of atomic masses are measured in a device called a mass spectroscope. 原子质量的精确值是用一种称为质谱仪的装置来测量的。
- A proton or a neutron, especially as part of an atomic nucleus. 核子质子或中心，尤指作为原子核的一个组成部分
- Extensive research has shown that fractional atomic masses always mean mixture of isotopes. 进一步的研究揭示出：部分原子质量常是同位素的混合物。
- They have the same atomic number and hence nearly identical chemical behaviour but different atomic masses. 它们有相同的原子序数，因此化学行为几乎完全一样，但原子量不同。
- A cloud is a mass of vapor in the sky. 云是天空中的水汽团。
- A proton or a neutron has about the same mass as a hydrogen atom. 质子或中子的质量和氢原子的质量大致相同。
- The mass rally was a total fiasco. 那次群众集会彻底失败。
- The atom bomb is of catholic concern. 原子弹受到普遍的关注。
