1·The hitch of the canned-motor pump for delivering hydrofluoric acid was analyzed. The corresponding transformation was conducted in order to guarantee the pump running long period.
分析了输送氢氟酸的液下屏蔽泵产生故障的原因，进行了相应的改造，保证了屏蔽泵的长周期稳定运行。
2·The reversed mud acid is the mud acid whose concentration and volume of hydrofluoric acid is higher than that of hydrochloric acid, its treatment mechanism is identical to the mud acid.
逆土酸系指氢氟酸浓度和用量高于盐酸浓度和用量的土酸，它处理地层的机理与土酸相同。
3·The silica xerogels were synthesized by ambient pressure drying method with hydrofluoric acid (HF) as catalyzer. The influence of catalyzer and drying method on the xerogels were analyzed.
以氢氟酸(HF)为催化剂，采用常压干燥法制备了二氧化硅干凝胶，分析了催化剂和干燥条件对干凝胶的影响。
4·The comparative tests show that the content of silicon dioxide in carbon materials determined by the melting method (MM) is more stable and accurate than the hydrofluoric acid method (MHA);
通过对比试验发现：测定炭素材料中二氧化硅的含量， 熔融法的分析结果比氢氟酸法更稳定、准确；
5·UHMWPE has a fine corrosion resistance to inoxidable acid (dilute sulfuric acid, nitric acid and large concentration hydrochloric acid, phosphorus acid, hydrofluoric acid, and salty solutions.
UHMWPE对非氧化性酸（烯硫酸、硝酸及浓度较大的盐酸、磷酸、氢氟酸、甲酸、乙酸）、氨和胺及各种碱、盐溶液都有两好的耐蚀性、两种材料都不耐强氧化性酸的腐蚀。