background value

基本解釋

The investigation includes microelement background value and combination law of road dusts in element character of geochemistry.
路面積塵微量元素地球化學特征研究包括元素背景值和組合規(guī)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）模型中的背景值構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、砷污染元素呈偏態(tài)分布，故采用偏態(tài)分布中的中位數(shù)法作了鉛、砷自然背景值及含量的統(tǒng)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.
水體中NH4+-N嚴重超標，D0嚴重不足，重金屬總體上污染不突出，但含量超過上海市土壤背景值的數(shù)倍。
農(nóng)業(yè)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為:37.51mg.kg-1,范圍值為:18.81mg.kg-1～74.83mg.kg-1。
物理學
背景值
本底數(shù)值
本底值