产业集群是一把“双刃剑”，对技术创新既具有外部经济效应，又具有外部不经济效应。
The industry merger is "a two-edged sword" which has both outside economical effect and outside non-economical effect on the technology innovation.
介绍了经济的外部效应的涵义，针对石油企业在生产开发过程中所表现的外部经济性和不经济性进行了剖析。
Meaning of external economic effects is described. External economic advantages and disadvantages of oil companies exhibited in the course of production development! Are analyzed.
介绍了经济的外部效应的涵义，针对石油企业在生产开发过程中所表现的外部经济性和不经济性进行了剖析。
Meaning of external economic effects is described. External economic advantages and disadvantages of oil companies exhibited in the course of production development! Are analyzed.
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