Basic principle, experiment condition, operating process, method and steps of X-ray diffraction method to determine free silica content of respirable dust in mines are introduced in this paper.

本文介绍了应用X射线衍射仪测定矿山呼吸性粉尘中游离二氧化硅含量的基本原理、实验条件以及操作过程、方法步骤等。

youdao

Surface must be completely cleam. dry and free of dust and oil. If applieed on plastic, polish the surface with sand paper to make it rough.

接合面必须清洁， 干燥， 无灰尘或油污， 若是塑料物件， 应先用砂纸打磨其表面， 使之粗糙。

youdao

The Bag Dump Hopper provides a quick, easy and virtually dust free way of dumping and filling your process system with material received in paper bags.

该自卸漏斗能够快速，容易，清洁地倾卸和装填纸袋中的材料的处理系统。

youdao