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- Pb background value 铅背景值
- The Pb accumulation concentration in the ring set was less than the background value in soil. 年轮序列中Pb的积累浓度低于土壤背景值;
- Cobalt background value is distributed in an apparent and regular order vertically and horizontally. 由于成土母质母岩的不同，土壤中的钴背景值有明显的差异；
- The sources, background value, environmental geochemistry features of fluorine, and its biological effects on animals, plants and human beings were reviewed. 阐述了环境中氟污染的来源、本底值和氟的主要环境地球化学特征及氟对植物、动物和人机体的生物效应。
- The investigation includes microelement background value and combination law of road dusts in element character of geochemistry. 路面积尘微量元素地球化学特征研究包括元素背景值和组合规律研究。
- The Middle Cambrian Tianpeng Formation has high background value of metallogenetic element, which is the advantageous ore source horizon. 田蓬组地层成矿元素高背景值,为有利之矿源层。
- According to the strata about the trace elements in coal of China,the different background value of trace elements in different parts of China were d rew out. 由于分析样品分布不均和采用的测试方法各不相同,本文的数据还不能准确地代表中国煤中微量元素的平均丰度值。
- As a gray exponential model with distortions, the precision of GM(1,1) depends on the conformation of background value and the selection of original condition. 摘要GM(1,1)模型是有偏差的灰指数模型，其精度取决于背景值的构造形式和初始条件的选取。
- Examples show that the new formula to calculate background valu e of non-equidistance series makes GM(1,1) model have a very high fitting and f orecasting precision. 实例说明，重构的背景值计算公式用于非等间距序列有很高的拟合和预测精度。
- Rocks formed by underground water genetic type of geomorphology, the characteristics of meteorology are the main factors controlling the background value of environment of iodine clement and the content of iodine in water. 影响地下水形成的岩石、地貌成因形态类型、气象等,是制约碘元素的环境背景值及其水中碘含量的主要因素。
- On basis of a great number of the analysis da-ta of soil samples, the distribution trend of background value and the main effecting factor of Ti, Zr. Hf. Ta in different soil types and regions were discussed in this paper. 在大量土壤样品分析数据的基础上;讨论了钛、锆、铪和钽在不同土类和地区的环境背景值的分布趋势和主要影响因素.
- The paper investigates the background value of agricultural non-point source pollution source in Chuxiong city, and analyzes the present pollution situations, and points out some countermeasures. 开展了楚雄市农业面源污染背景调查,分析了污染现状,并提出了对策。
- The study shows that the contents of thallium in pyrite cinders are obviously higher than the Clark value and soil background values. 结果显示硫铁矿焙烧灰渣中铊含量远高于克拉克值和土壤背景值;
- The Background Values and Distribution of As and Cr in Main Grains in shaanxi Area. 陕西地区主要粮食作物中砷、铬元素背景值及其分布
- The geochemical field of the Hefei Basin belongs to that of low background values, low moisture and inhomogeneity. 合肥盆地地球化学空间场属低背景、低湿度和非均匀场范畴。
- Soil cobalt background values are high in middle and northwest part of Yunnan province. 土壤钴背景值在澳中和澳西北局部地区较高。
- In the Campania region, baseline and background values are often coincident, where the samples represent catchment basins away from urban or industrial areas. 在坎帕尼亚地区，样品代表的是远离市区或者工业区的汇水盆地，所以基线值和背景值经常是吻合的。
- A little crack detracts from the value of the vase. 小小的裂痕减损那个花瓶的价值。
- Under low background values, the residual rates of volatile phenol and benzo (a) pyrene in A. chinensis are 13.54% and 6.87%, respectively. 在低背景值情况下，挥发酚和苯并[a]花在羊草中的残留率分别达到13.;54%25和6
- Abstract: With relatively high total gold background values,the strata of the greenstone belt in western Shandong are source beds of gold deposit. 摘 要： 山东鲁西地区绿岩带地层总体金背景值较高，是金矿形成的矿源层。
