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.
结果表明，这种估值方法突出反映了钙元素在中国的宏观变化规律。
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;
区域环境污染综合防治向高层次发展；环境容量和环境背景值等方面的研究取得突破；
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.
文章对十多年来发生在我国西北地区的较大沙尘暴，沙尘暴尘的沉降量、沉降范围、化学组分、粒径分布、对大气环境降尘背景值的影响等问题进行了调查、分析，综述了这方面的一些研究成果。