The study of element background value reflects the degree of departure of the microelement in road dusts from element of its source area.
积尘元素背景值的研究反映积尘微量元素偏离其来源区元素的程度。
An Afghan woman dusts vehicles expecting alms as they stop at a traffic light on a main road in Kabul June 20 2011.
一名阿富汗女子粉尘车辆，期待施舍，因为他们停止在主干道上的交通灯在喀布尔6月20日，2011。
应用推荐