When using a common sampling tube, a formula for approximate calculation of the flow in the sampling tube is needed to meet the request of equi-speed sampling.
在使用普通型采样管时，为了满足采样现场的要求，应有一个与之相适应的等速采样流量近似计算公式。
When using a common sampling tube, a formula for approximate calculation of the flow in the sampling tube is needed to meet the request of equi-speed sampling.
在使用普通型采样管时，为了满足采样现场的要求，应有一个与之相适应的等速采样流量近似计算公式。
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