curve of flow capacity-head 流量扬程曲线
The full round port area provides maximum flow capacity and minimum head loss.
完全的圆形流道截面能够提供最大的流量和最小的流压损失。
The characteristics of centrifugal pumps are sent to liquid capacity, the flow evenly, but the resulting pressure head is not high, and the pressure head as the flow changes.
离心泵的特点是，送液能力大，流量均匀，但产生的压头不高，且压头随着流量的改变而变化。
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