The experiments have shown that the technology of oxidation degradation with nitric acid and sulfoxidation with sodium sulphite to produce water-reducer of cement with decomposed coal is available.
大量实验证明以风化煤为原料采用硝酸氧化降解后再磺化的方法生产混凝土减水剂的工艺是合理的。
2
Rising Artist Bristol Board is a fine quality, acid-free sulphite Bristol for a variety of USES. It's available in two finishes - Vellum and Plate.
这是一个优良品质，无酸，亚硫酸盐板纸，多用途。两种面，滑面和仿羊皮纸面。
3
Sulphite pulp: Acid pulp made from wood chips cooked under pressure in a solution of bisulphite of lime.