在一定条件下，对于反应mA(g)+nB(g) 
cC(g)+dD(g)，C物质的体积分数(C%)与温度、压强的关系如图所示，下列判断正确的是（ ）
| A．ΔH＜0 m+n＞c+d | B．ΔH＜0 m+n＜c+d |
| C．ΔH＞0 m+n＞c+d | D．ΔH＞0 m+n＜c+d |
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