20. At the solid-liquid-vapor triple point of a pure substance, what is the slope, dp/dT
of phase transition?
(A) solid-vapor line ＞ liquid-vapor line
(B) solid-vapor line = liquid-vapor line
(C) solid-vapor line ＜ liquid-vapor line
(D) solid-vapor line = liquid-vapor line = 0
(E) all of the above is incorrect
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