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【单选题】
流体在圆形管道中流动时,连续性方程可写为( )
A.
u 2 /u 1 =D 1 /D 2
B.
u 2 /u 1 =(D 1 /D 2 ) 2
C.
u 2 /u 1 =(D 2 /D 1 ) 2
D.
u 2 /u 1 = D 2 /D 1
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A.
At a bank.
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查看完整题目与答案