A.An individual makes his own living or does not do it.
B.An individual is solely responsible for his success or failure.
C.Individuals work separately and produce their own things.
D.Individuals succeed or fail depending on their families.
第3题
A.Re数是一个量纲为1的数群
B.Re数反映了流体流动中的惯性力与黏滞力之比
C.对于管内的湍流流动,其层流内层的厚度随着Re数的增加而逐渐变薄
D.流体的流动类型可用Re数来判断,当Re≤2000时,流体的流动类型属于层流
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