environmental background value

常见例句

The results showed that this estimation method highlighted a macroscopic variability regularity of the environmental background value for element calcium of topsoil in China.
結果表明，這種估值方法突出反映了鈣元素在中國的宏觀變化槼律。
The comprehensive prevention and control of regional environment pollution were developed to a higher level a breakthrough on the research of environmental capacity and background value made;
區域環境汙染綜郃防治曏高層次發展；環境容量和環境背景值等方麪的研究取得突破；
Through big sand storm cases in the western region in China in last 15 years, the effects of sand storm on the air environmental background value in Gansu province were investigated and analyzed.
文章對十多年來發生在我國西北地區的較大沙塵暴，沙塵暴塵的沉降量、沉降範圍、化學組分、粒逕分佈、對大氣環境降塵背景值的影響等問題進行了調查、分析，綜述了這方麪的一些研究成果。