The pressure value is relatively fixed, using pressure differential allows blood to flow.
这种压力值相对比较固定，利用压力差使血液向上回流。
Based on a s equation, a new expression was derived for pressure drop in fixed bed with gaseous flow.
本文在a—s方程的基础上推导出气体流经固定床时的压降表达式。
Capacitive pressure difference sensor is fixed in the center of the tube and connected with the pulse width modulation circuit so that capacitive flow transducer is made up.
把电容式差压传感器固定在管道中央，并配接脉冲调宽电路，即构成电容式流速变送器。
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