已知某地测风在Z=20 m高度处的风速v1为23 m/s,地表粗糙度指数取0.1,则在Zn=10 m高度的风速为______ m/s。______
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The critical Reynolds number of a rough-walled pipe is about _______.
A. 3x106
B. 3x105
C. 2 000
D. 1 500
An energy interaction is heat transfer if its driving force is a _______ difference.
A. density
B. pressure
C. volume
D. temperature
The rate of heat conduction through a plane layer is inversely proportional to _______ .
A. temperature difference
B. heat transfer area
C. thermal conductivity
D. the thickness of the layer
In _______ , it is due to the combination of vibrations of the molecules in a lattice and the energy transport by free electrons.
A. liquids
B. solids
C. gases
D. fluids