Which one is the correct expression of the density?
选项:
A:
Mass*Volume
B:
Mass/Volume
C:
Volume/Mass
Mass*Volume
Mass/Volume
Volume/Mass
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it has three level(Manual/QP/OPM)
B:it has two volume(Volume I/Volume II)
C:none of above is correct
D:When T=Tc, if P=pc, there are two imaginary roots and one real root, and the real root is the molar volume of gas
B:When T < Tc, the equation may have one or three real roots
C:When T=Tc, if p ≠ pc, there is only one real root and two imaginary roots
D:When T > Tc, a real root is the molar volume of the gas
A process doubling the temperature at constant pressure.
B、An adiabatic free expansion doubling the volume.
C、A process doubling the pressure at constant volume.
D、An adiabatic expansion doubling the volume.
E、A process doubling the volume at constant temperature.
School education
B:Textbook
C:History
D:Mass media
time
B:speed
C:sequence
D:order