根据不可压缩流体的连续方程,流管横截面变大,平均流速必然____。

lk2025-03-14  4

题目:根据不可压缩流体的连续方程,流管横截面变大,平均流速必然____。

A. 变大

B. 不变

C. 变小

D. 不一定

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