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Accurate calculating of the effective horsepower of pumping unit is the key to calculating the pumping unit system efficiency.
正确计算抽油机井的有效功率是计算抽油机井系统效率的关键。
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For this unit, the efficiency rate is very high because the layout is very effective.
以这单位而言，由于它实用的设计，所以实用率很高。
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