| 1. | It is necessary to enrich the fuel by increasing the percentage concentration of uranium-235 .
必须提高铀235浓度的百分比，使燃料浓集。 |
| 2. | The lognormal distribution is widely used in geology to characterize sediment size variations and geochemical element concentrations .
在地质学中，对数正态分布已被广泛用以表示沉积粒度变化特征和地球化学元素浓集情况。 |
| 3. | Biological concentration factor
生物浓集因素 |
| 4. | Effeets of different water disinfection ways on mutagenicities of organic extracts from tap water
不同消毒方法对自来水中有机浓集物致突变性影响 |
| 5. | Study on the determination of trace cu by ddtc chelating resin preconcentration and thin layer resin phase spectrophotometry
螯合树脂预浓集薄层树脂相吸光光度法测定痕量铜的研究 |
| 6. | Studies show that there exist marked difference between accumulative mechanism of nutritive elements and that of toxic elements
而且，植物普遍存在抗元素浓集的“生理生物化学障” ，它主要存在于根部。 |
| 7. | Synthesis of dithiotricyanic acid immobilized silica gel and its application to the faas determination of gold after on - line preconcentration and separation
二巯基取代三聚氰酸键合硅胶的合成及其在金的在线预浓集分离火焰原子吸收光谱分析中的应用 |
| 8. | A study of regional geochemical characteristics of four main genetic types of copper deposits in west qinling mountain area shows that there exist very few concentration areas of copper or other elements in 72 copper deposits or occurrences
摘要对西秦岭地区4种主要成因类型铜矿的区域地球化学研究证明，在72个铜矿床或矿（化）点上很少显示铜或其他元素的浓集区。 |
| 9. | The developments and applications in flow injection vapor generation atomic absorption spectrometry ( fi - vgaas ) in recent years were reviewed , involving on line separation and preconcentration , on line digestion and prereduction , on - line speciation analysis and typical applications of these techniques
摘要综述了近年来流动注射蒸气发生原子吸收光谱分析( fi - vgaas )技术的进展及应用，主要包括在线分离和预浓集、在线消化、在线预还原、在线形态分析技术。 |
