问答题

简答题翻译：The most common means measuring rate of flow of a fluid is based on the principle that if there is a contraction or constriction (a section of reduced diamater) in a pipe,the pressure of a fluid flowing down-stream from the contraction will be lower than that up-stream from the contraction.

【参考答案】

测量一种流量的最普通方法是根据这样一个原理：即为一个管子中有一个收缩截面(一个直径减少的截面)或缩颈，液体由此颈向下游流动的压力，会小于上游的压力。

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