The result indicates some conclusions. Series system adopting secondary pump has good ability of energy savings.

结果表明，与普通单泵的串联系统相比，采用串联泵的串联系统有很好的节能效果；

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The paper analyses the principles of adding a vertical secondary pump station, deduces a formula of energy-saving by adding a secondary pump station, and gives...

分析了二级供水站的设置原则，推导出了设置二级供水站的节能计算公式，并给出了计算示例。

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The paper analyses the principles of adding a vertical secondary pump station, deduces a formula of energy-saving by adding a secondary pump station, and gives a calculation example.

分析了二级供水站的设置原则，推导出了设置二级供水站的节能计算公式，并给出了计算示例。

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Moreover, many parents of primary or secondary school students find in-person tutoring to be inconvenient, costly (especially at the gas pump), and lacking in quality selection, especially compared to the wider range of tutors found online.

FORBES: Can Online Tutoring Reverse America's Academic Decline?