同位素

The results show that there are some differences in the degree of 〓O enrichment for the different types of magmatic rocks, and their sequence of 〓O-enrichment is as follows: acid rocks ＞ neutral rocks ＞ basic rocks ＞ ultrabasic rocks.

结果表明，不同类型岩浆岩氧同位素分馏性质是有差异的，其〓O富集顺序在热力学平衡时为：酸性岩＞中性岩＞基性岩＞超基性岩。

The shapes, occurences, rock types, mineral components and Petrochemical components of three ultrabasic rock groups all have different characteristics and show certain regularities. K-Ar and Sin-Nd iso...

各岩群的形态、产状、岩石类型、矿物成份、化学成份各有特点，表现出一定的规律性。K－Ar及Sm－Nd同位素年龄表明，这些超基性告形成于中元古宙、海西期及印支期。

It is important to avoid the use of uranium compounds of unspecified isotopic composition.

要避免使用那种非专用的同位素成份的铀化合物。

U-Pb isotopic system of uraninite gives a mineralization age of 407 Ma ±, this is similar to the whole-rock isochron age of Rb-Sr.

通过铀铅同位素体系研究发现，矿化年龄在407Ma左右，与Rb-Sr全岩等时线年龄接近。

The distribution of uranium isotope composition is not only can be used to predict the location of uranium ore body, but also can be used to study the rolling of the roll during the process of the ore body formation.

该砂岩型铀矿床的铀同位素组成分区特征不仅是预测铀矿化定位的依据，而且也充分说明了铀富集成矿过程的滚动性。

Left ventricular function can be assessed by contrast ventriculography, radionuclide ventriculography, or echocardiography.

通过对比心室造影、同位素心室造影或超声心动图可以评价左心室。

The GEOTOP centre develops multi-disciplinary projects such as the study of uranium-thorium-radon desequilibrium in volcanology or the study of isotopic tracers at the water-sediment interface and internal process of the earth.

此中心开展了多学科的研究项目，如火山学中铀-钍-氡消除平衡的作用研究、水沉积物分界面的同位素示踪剂研究，以及地球内部作用的研究。

Their Volcanology, Geochemsitry and Petrology shore based analytical and experimental laboratories include the following equipment for geochemical analysis: thermal ionization mass spectrometers, radioactive isotope tracer and dating facilities, an electron microprobe and an X-ray fluorescence spectrometer.

他们的实验研究设备有：热电离大型分光计、放射性同位素跟踪仪、地质年龄测定器、电子微探针、x射线荧光分光计。

The levels of PBDEs in water snake, fish, prawn and Chinese mysterysnail ranged 39.6~186, 1.82~75.7, 4.60~17.1 and 7.26~17.0μg·g-1, respectively.

为调查电子垃圾回收活动对当地水生生物造成的多溴联苯醚污染，测定了广东某电子垃圾回收地附近水库中水生生物样品（水蛇、鱼类、草虾和田螺）和对照区样品中18种PBDEs含量，通过对样品氮同位素的测定，探讨了PBDEs在该地淡水食物链上的生物富集特征。

According to metamophic core complexes, syn-tectonic intrusive rock and its isotope dating data, divide Songliao basin evolution history into three stages: 1 orogenic period land-land collision; 2 post orogenic period mantle delamination, metamophic core complexes uplift and collapse extension; 3 weak extend stable depression in continent.

根据变质核杂岩、同构造侵入岩以及同位素年龄资料，将松辽盆地构造演化历史划分三个阶段：(1)造山期的陆—陆碰撞；2造山期后的地幔拆沉，变质核杂岩上拱和塌陷伸展断陷；(3)弱伸展稳定大陆内坳陷。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷