运动粘度的量纲为______ ,动力粘度的量纲为______ 。
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The kinematic viscosity of saturated steam is ______ at 200 ℃. And the dynamic viscosity of heavy oil is ______ at 333.15 K.
Fluid steady flow only has the relationship with space coordinates and is independent of ______ .
There is a function N=f(n1, n2, n3…nk). According to Pi theorem, this function can be transformed into a function with ( ) dimensionless parameters.
A. k
B. k-1
C. k-2
D. k-3
The common units of pressure include ( ).
A. SI unit
B. Manometric unit
C. Atmospheric pressure (atm)
D. Hydraulic unit