This text attempts to regard silica as shell materials, regard nanometer iron and carbonyl iron particle as core materials to prepare a kind of new-type absorbent.

本文以二氧化硅为壳层材料，以纳米铁以及羰基铁粒子为核层材料，制备一种新型的吸收剂粒子。

youdao

This text is supported by public buildings on the senior level in the city; regard the tops of the public buildings on the senior level as the research object.

本文以处于城市中的高层公共建筑为依托，以高层公共建筑的顶部为研究对象。

youdao