Others, though, question whether fossil stromatolites really are the result of bacterial action, and wonder whether they might be chemical precipitates instead.
尽管另一些人，质疑层叠岩石化石是否是细菌活动的结果，但他们也想知道那些化石是否只是化学沉淀物。
In this paper, the precipitates in if steel have been qualitatively and quantitatively analyzed by using electrolysis extraction, Xray diffraction and chemical phase separation.
本文用电解提取、X射线衍射以及化学相分离，对析出相进行了定性定量分析。
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