Firstly , we lucubrated the problems on the economic running quality of the coal industry qualitatively.

首先对我国煤炭产业经济运行现状及其所存在问题深入地加以定性分析.

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This invention can ensure safe, stable and economic running of the power system.

本发明能有效的保证电力系统电压的安全-稳定-经济三者协调优化的运行.

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Street economic running smoothly.

街道经济运行平稳.

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