采用平衡振荡法研究了精异丙甲草胺在粘壤土、粘土及砂壤土中的吸附和解吸附行为。
The adsorption and desorption behaviors of S-metolachlor in three different soils were investigated using the batch equilibration method.
讨论金属与型壳界面作用对精铸件表面粗糙度和粘砂缺陷的影响。
The effect of metalceramic shell interface reactions on surfaceroughness and the defects of burn on sand in investment casting are discussed in this paper.
答：先把原矿石进行多级精选，然后再进行制砂，分级，磁选，最后再进行精提纯。
Answer: the first raw ore to multistage selected, and then made sand, grade, magnetic separation, finally carried out again pure purification.
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