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23. 层流和湍流的本质区别是( )。

单选题
2021-09-01 19:09
A、湍流流速大于层流流速
B、层流时Re数小于湍流时Re数
C、流道截面大时为湍流,截面小的为层流
D、层流无径向脉动,而湍流有径向脉动
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正确答案
D

试题解析

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