当混合比例超过20%以上时，消防泵则选择该泵时，试压泵需要对水力特性进行更新。
When when mixed proportion exceeds more than 20%, choose this pump, need entering even more to the water conservancy characteristic.
用水力实验方法研究了明渠水流中园形污水射流近区扩散与混合的特性。
The characteristics of wastewater round jet into open channel flow and its mixing and diffusing in the near-field were investigated by means of a laboratory experiment.
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