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词汇 background level
释义 background level ˈbækɡraundˈlevl 短语¹⁴⁴⁹⁷²⁺²
基本英英近义反义例句例句
本底水准,背景值

Noun:
the amplitude level of the undesired background noise近义词 noise level噪声级,噪声电平,噪音水…
The background concentrations of ambient air pollutants were used as evaluation stan-dards.采用大气污染物浓度的背景值为评价标准。
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。 The results showed that the nutrients background level of degenerative mountains in Hebei province is very low and the contents of N, P almost are below the critical value.
经测定,河北省退化山场土壤养分本底值含量普遍极低,氮、磷极度缺乏,基本都处于临界值以下; cnki
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