1.

The change of volume per unit time is __________

A. ( frac{ V}{ z}=-V_0 )
B. ( frac{ V}{ z}=-a_v V_0 )
C. ( frac{ V}{ z}=-m_v frac{ }{ t} )
D. ( frac{ V}{ z}=-m_v dxdydz frac{ }{ t} )
Answer» E.


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