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Terms for subject Economy containing 系石 | all forms
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国家石油评价系统National Appraisal System for Petroleum
美国石油雇主与雇员关系咨询委员会Petroleum Employers Advisory Council on Employee Relations
简化的石油天然气会计系统simplified oil and gas accounting system
美国石油工程院系长协会Association of Heads of U. S. Petroleum Engineering Schools

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