In the paper, the formula of economic friction factor for hydronic heating system with intermediate boosting pump station and different laying mode is derived theoretically.

本文从理论上推导出带中间增压泵站、有不同敷设方式的热水供热网经济比摩阻的计算公式。

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Treated oil pipes can decrease the friction damage, increase charge volume and anti scaling for normal operation and enhancing the economic effects in the mine.

经过处理后的防腐油管，能减小摩阻损失，增大排量；防止结垢，保持高排量的持续生产；减少卤井事故的发生，提高企业的经济效益。

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Entrepreneurs grow wealthy by reducing the economic friction between buyers and sellers.

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But smoother increases in marginal tax rates, as under current law, create less economic friction, and fewer deadweight losses, then those with a number of peaks and valleys.

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Communications technologies of all kinds function as an economic lubricant, reducing friction in the economy and thus accelerating economic growth.

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