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国内大型石油企业的一个特点是大部分核心生产经营业务重组上市,还有许多支持性业务如石油服务、工程建设、基础研究等主要业务由于各种条件限制保留在上市股份公司之外,而这些业务本身都是大型石油企业发展必
A characteristic of the large domestic oil companies is that most of their core business operations are reorganized and listed. There are many supporting businesses such as petroleum services, engineering construction and basic research that are kept outside listed public companies due to various conditions, and these Business itself is the development of large oil companies must