a displacement method of chromatography for analysis of group composition of light crude oil and condensate was introduced in the paper.
本文详细介绍顶替色谱法进行轻质原油及凝析油的烃族组分分析。
the june light crude contract gained 44 cents to $48.98 a barrel in electronic trading, while the june contract for brent crude rose 52 cents to $48.86.