The mass fraction of group composition was worked out accurately.

计算出族组成的质量分数。

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The mass fraction of the product was 99.1% as determined by high performance liquid chromatograph.

产物经过高效液相色谱归一法测定，质量分数为99 1%。

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With the increase of the mass fraction of inorganic salts, mixed surfactant micelles increases, the shear viscosity changes.

随着无机盐质量分数的增大，混合表面活性剂胶束增大，剪切粘度发生改变。

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He told CNN that there needed to be greater investment in random searches by agents with explosive trace detection equipment and greater deployment of CCTV cameras, saying the extra investment needed in mass transit security amounted to a fraction of the economic cost of a successful attack.

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