表层沉积 meaning in English

overlying deposit
superficial deposit
surface deposit
surficial deposit

Characterization of fresh bc and asphaltenes show that fresh bc structurally rigid and physically condensed . and different to graphite , bc contains a little aliphatic groups and oxygen - containing groups
但现代碳黑又不同于石墨，它还具有一些含氧官能团、脂珠江三角洲地区土壤和表层沉积有机质的非均质性研究肪碳等结构。
The results showed that both of water enverionment and biotic enverionment were good , and surface sediment enverionment was polluted in middle level besides that of some stations were seriously polluted , in which c ( subscript d ) plaied a main role in pollution
结果表明，水质环境和生物环境处于良好水平；表层沉积环境处于污染水平，有的站达到严重污染水平，其中重金属锡的贡献率最大。