1.
Seventy of the 350 naturally occurring isotopes are radioactive.
自然界有350种天然同位素，其中70种有放射性。
2.
The isotope ratio is directly used for comparing oils or gases.
同位素比率直接用于比较各种石油或天然气。
3.
The Kinetic Modeling of Gaseous Components and Gaseous δ~(13)C: Approaches for Revelation of Gases Accumulation Process;
天然气组分及碳同位素动力学研究与地质应用
4.
Study of Carbon Isotopes Fractionation during the Process of Nature Gas Generation;
天然气生成过程中的碳同位素分馏作用研究
5.
Measurement of Lithium Isotope in Natural Samples Using MC-ICP-MS;
运用MC-ICP-MS测定天然样品的锂同位素组成
6.
a radioactive isotope of an element; produced either naturally or artificially.
天然存在或人工合成的某种元素的放射性同位素。
7.
naturally occurring isotope
自然界存在的同位素
8.
Carbon Isotope Fractional Distillation of Natural Gas and Its Application in Xujiaweizi Area;
天然气碳同位素分馏作用及其在徐家围子地区的应用
9.
JUDGEMENT OF THE RECHARGE SOURCE IN JINCHUAN MINE BY USING THE NATURAL ENVIRONMENTAL ISOTOPIC METHOD
天然环境同位素技术判定金川矿区井巷排水补给来源
10.
Carbon isotope kinetics analysis of natural gas methane for deep zone gas field in Xujiaweizi area
徐家围子深层气田天然气甲烷碳同位素动力学分析
11.
APPLICATION OF STABLE ISOTOPES TO THE GEOCHEMICAL EXPLORATIONS FOR GAS HYDRATE IN THE BLAKE RIDGE SEA AREA
稳定同位素在天然气水合物地球化学勘查中的应用简介——以“布莱克海隆”海区为例
12.
Simultaneous Measurement of Primary and Secondary Kinetic Deuterium Isotope Effects by Natural Abundance ~2H NMR Ⅰ. Inter-as well as Intramolecular Competition using Internal Reference
天然氘核磁共振测定一级和二级动力学氘同位素效应 Ⅰ.内标的分子内与分子间竞争法
13.
Compositions of S and Sr isotopes for celestine are similar to those for general sea waters.
天青石中硫、锶同位素值和海水硫、锶同位素值相近。
14.
Study of Metal Elements Simultaneous of the natural plant by ICPAES
ICP-AES法同时测定天然植物中金属元素的研究
15.
Sulfur Isotope of the Dahebian Barite Deposit,Tianzhu,Guizhou Province
贵州天柱大河边重晶石矿床硫同位素研究
16.
Study on Application of Natural Resource Complex Chemistry--Complex Separation of Puertin;
天然产物配位化学应用研究——葛根素配位色谱分离
17.
Q9.Natural vitamins are better supplements for the diet than synthetic vitamins.
9.天然维生素同合成维生素相比，是更好的补养品。
18.
Determination of Different Species of Aluminum in Natural Waters bya.c.oscillopolarography using Solochrome Violet RS
酸性媒染紫—示波计时电位法测定天然水不同形态铝