Because there are water exists, ammonia and oil acid oxide role will generate precipitation.
因为有水分存在时，氨与油的酸性氧化物作用会生成沉淀。
2
Ammonia and nitrite were not detected at the start, and no precipitation of fluoride salts was observed during these bioassays.
氨和亚硝酸盐含量均未检出在开始时，并没有降水氟盐的观察期间，这些生物测定。
3
Fibrous cobalt complex, a precursor of fibrous cobalt powders, can be prepared by coordination precipitation, using ammonia, oxalate and cobalt chloride as the raw materials.