production trunk line
... Replace Production Automation Line 更新制造流水线 production trunk line 输油干线 Production Expansion Line 生产扩展线 ...
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俄东部输油干线 russian eastern oil transmission trunk pipeline
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阐述了一种新型多功能交流变频调速控制系统，用于保持油田输油管主干线油压恒定。
A novel AC variable frequency converting control system with multiple functions is introduced. The system is suitable for maintaining constant oil pressure in main line of oil pipelines.
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