实验得出，雷诺数Re与流速v，特征长度，流体密度，动力黏度等因素有关。试用π定理整理Re的无量纲表达式。
参考答案：
— What do you think of your end-of-term examinations next week?
— I wish that I ______ better than the last school year.[ ]
A. do
B. had done
C. could do
D. would have been
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，流体密度
，动力黏度
等因素有关。试用π定理整理Re的无量纲表达式。
，流体密度，动力黏度等因素有关。试用π定理整理Re的无量纲表达式。