Research on static sealing by ferric nitride magnetic fluid .

氮化铁磁性流体密封研究。

A red soil containing ferric oxide ; often used as a pigment .

一种含氧化铁、用作色素和颜料的红色土壤。

Their removal is effected by aluminum and ferric salts .

用铁盐和铝盐能将其有效地除去。

The permit holder shall install chlorine gas detector near the tank vents for each ferric chloride and sodium hypochlorite storage tank , and install sulphur dioxide gas detector near the tank vents for each ferric chloride and sodium bisulphite tank .

许可证持有人须在每个氯化铁及次氯酸钠储存缸的排气管附近装设氯气探测器，以及在每个氯化铁及亚硫酸钠储存缸的排气管附近装设二氧化硫气体探测器。

This paper gives a review of the manufacturing method of inorganic high polymer coagulant polymerized ferric sulfate .

综述了无机高分子聚合铁盐类混凝剂的几种生产制备方法。