問(wèn)答題

【簡(jiǎn)答題】翻譯：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.

答案：測(cè)量一種流量的最普通方法是根據(jù)這樣一個(gè)原理：即為一個(gè)管子中有一個(gè)收縮截面(一個(gè)直徑減少的截面)或縮頸，液體由此頸向下游流...

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