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；

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The productive capacity is usually expressed in terms of an activity base, such as machine hours, direct labor cost, or direct labor hours.

标准生产能力通常表达为机器工时、直接人工成本、直接人工工时等指标。

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As an important natural resources and social factor of production, land has been considered as the foundation and activity base of human life since ancient times.

土地自古以来就是人类的衣食之源，同时它作为重要的自然资源和社会生产要素，也是人类生产和生活不可或缺的活动基地。

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Those who rely on past relationships between the monetary base and economic activity have taken the rapid growth in the base as portending very rapid inflation.

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But Nato's International Security Assistance Force (Isaf) said there were no reports of militant activity in or around the base at the time of the crash.

BBC: Seven killed in US cargo plane crash at Afghan base

Although this figure was lower than the 54 that had been forecast one has to bear in mind that a level greater than 50 signals growth or an expanding base of economic activity.

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