气体和液体统称为流体.如何分析流体产生的压力和压强?如何分析流体的运动学和动力学特征?如何计算流速(或流量)以及对流体做的功?如何分析流体内能的变化?这些问题经常困扰着广大考生.现举例分析. Gases and liquids are collectively referred to as fluids. How do you analyze the pressures and pressures produced by fluids? How do you analyze the kinematic and dynamic characteristics of fluids? How do you calculate the flow rate (or flow rate) and the work done to a fluid? How do you analyze the changes in fluid internal energy? These Problems often plague the majority of candidates.