解决不同的流量问题有各种专门设计的面积流量计。
Special designs of area meters are available to solve many different flow problems.
水利行业经常要进行流量计算，这样就会遇到曲面拟合和曲面积分的问题。
The calculation of flow is often needed in water conservancy, and surface-fitting and double integration are usually met in order to solve this problem.
水利行业经常要进行流量计算，这样就会遇到曲面拟合和曲面积分的问题。
The calculation of flow is often needed in water conservancy, and surface-fitting and double integration are usually met in order to solve this problem.
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