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【单选题】
下面是某化学研究小组探究外界条件对化学反应速率和化学平衡的影响规律图象，其图象和实验结论表达正确的是 （ ） 注：①中的反应式为：A（g）+3B（g） 2C（g）；②中的反应式为：A（g）+B（g） 2C（g）； ③中的反应式为：A（g）+3B（g） 2C（g）；④中的反应式为：A（g）+B（g） 2C（g）A.
①是其它条件一定时，反应速率随温度变化的图象，正反应△H＜0
B.
②是其它条件一定时，化学平衡常数随温度的变化图象，正反应△H＜0
C.
③是在有无催化剂存在下建立的平衡过程图象，a是使用催化剂的曲线
D.
④是一定条件下，向含有一定量A的容器中逐渐加入B时的图象，压强p 1 ＞p 2
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