题目内容

水在半径为R,长为L的管道中做层流,管中心流速为v,下面那种情况下可以让水不再做层流?()

A. 减小管道半径为原来的一半
B. 长度微弱增加
C. 将水换成甘油
D. 水流速度明显增加

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