根据不同流型讨论了等面积圆环法确定断面平均流速时所产生的误差。
The error caused by the ring method of equivalent area to measure the mean velocity of the circular pipe is studied by the different now pattern.
流速-面积法流量测验中，测深测速垂线的定位是流量测验的前提。
In discharge measurement by the velocity-area method, determining positions of velocity and depth-measuring verticals is a prerequisite condition to this measurement.
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