Once we have that bulk composition?
一旦我们有大部分组成？
Once we have that [bulk composition?
一旦我们有[大部分组成?。
Systematic changes seen as marked gradients in petroleum bulk composition, component concentrations and molecular indicators have been observed in biodegraded oil columns.
在生物降解油柱中观测到了石油总体组成、饱和烃和芳烃系列化合物随深度呈连续而系统的梯度变化。
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