[单选] 发生调幅分解的热力学判据是( )
A: d2G/dx2<;0
B: d2G/dx2>;0
C: dG/dx>;0
D: dG/dx<;0
A: d2G/dx2<;0
B: d2G/dx2>;0
C: dG/dx>;0
D: dG/dx<;0
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