pressure-drop coefficient

例句：

1. 1.The pressure drop coefficient is a critical parameter in the design of oil pipelines.
   压力下降系数是石油管道设计中的关键参数。
2. 2. The efficiency of the pressure drop coefficient is directly related to the size of the pipe.
   压力下降系数的效率与管道的大小直接相关。
3. 3. The pressure drop coefficient can be used to calculate the flow rate of a fluid through a pipe.
   压力下降系数可以用来计算流体通过管道的流量。