1·Chromium oxides and hydroxides.
铬的氧化物及氢氧化物。
2·This method does not produce or require the handling of corrosive quaternary ammonium hydroxides.
这一方法不产生或不要求处理腐蚀性的季铵氢氧化物。
3·The technogenic sedimentation refers to the precipitation of gypsum, calcite, fluorite, as well as hydroxides, oxides and salts of some heavy metallic elements from polluted groundwater.
后者是指从被污染地下水中沉淀析出石膏、方解石、萤石以及某些重金属元素的氢氧化物、氧化物、酸式盐和碱式盐的过程。
4·The test demonstrates that alkali carbonates, alkali hydroxides and a combination of sodium carbonate with ferriferrous oxide all exhibit approximate catalytic activity.
试验证明：碱金属碳酸盐，碱金属氢氧化物和碳酸钠同四氧化三铁的复合剂，都表现出相接近的催化活性。
5·Iron and aluminum hydroxides are present in soils in both crystalline and amorphous forms.
土壤中出现有结晶和非结晶形式的铁和铝的氢氧化物。