题目内容

离心泵压头的物理意义是,它的单位是。

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离心泵安装在特定管路系统中,已知泵的性能:Q=0.02m3/s,H=20m;管路性能:Q=0.02m3/s,H=16m。则调节阀门的压头损失为m,其消耗的理论功率为W。（保留一位小数）

若被输送的流体粘度增高,则离心泵的压头,流量,效率,轴功率。（填“减小”或“增大”）

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Places where many species reach the edges of their distributions is called ( )