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题目： 单选题烟气在加热炉回热装置中流动，拟用空气介质进行实验。已知空气黏度
，烟气运动黏度
，烟气流速
，如若实际与模型长度的比尺λL=5，则模型空气的流速应为：（）
A3.75m/s
B0.15m/s
C2.4m/s
D60m/s
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