Third, the analysis of activity base cost of oil & gas enterprises.
三是油气田企业的作业成本分析；
The reading activity is class base and work on their reading skill.
阅读活动是基于他们的英语基础和阅读能力而展开的。
Activity of acid catalyst was higher than that of base catalyst.
酸催化比碱催化具有更高的反应活性。
Activity of acid catalyst was higher than that of base catalyst.
酸催化比碱催化具有更高的反应活性。
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