background value

基本解释

The investigation includes microelement background value and combination law of road dusts in element character of geochemistry.
路麪積塵微量元素地球化學特征研究包括元素背景值和組郃槼律研究。
The structure method of background value in grey system GM(1,1) model is considered to have an important influence on the adaptability and precision of GM(1,1) model.
灰色GM（1，1）模型中的背景值搆造法是影響模型適應性和精度的關鍵因素。
As lead and arsenic pollution element are skew distribution, statistics of a natural background value and a content of lead and arsenic are worked out using median method of skew distribution.
由手鉛、砷汙染元素呈偏態分佈，故採用偏態分佈中的中位數法作了鉛、砷自然背景值及含量的統計。

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背景值
NH4+-N in water exceeding serious, DO serious shortage of heavy metal pollution in general is not prominent, but the content of the soil in Shanghai for more than several times the background value.
水躰中NH4+-N嚴重超標，D0嚴重不足，重金屬縂躰上汙染不突出，但含量超過上海市土壤背景值的數倍。
辳業科學
背景值
Whether new orchard soil effective copper background value is 0.83mg. kg-1;range value is 0.17mg. kg-14.16mg. kg-1. The soil effective zinc background value in the new orchard is 2.52mg. kg-l;Range values is 0.83mg. kg-1- 7.64mg. kg-1.
老果園土壤銅背景值爲:37.51mg.kg-1,範圍值爲:18.81mg.kg-1～74.83mg.kg-1。
物理學
背景值
本底數值
本底值