已知：2CO(g)+O2(g)=2CO2(g) 
H =-566kJ·mol－1 N2(g)+O2(g)="2NO" (g) H =+180kJ·mol－1则2CO(g)+2NO(g)=N2(g)+2CO2(g)的H是
| A．－386 kJ·mol－1 | B．＋386 kJ·mol－1 |
| C．－746 kJ·mol－1 | D．＋746 kJ·mol－1 |
已知：2CO(g)+O2(g)=2CO2(g) H =-566kJ·mol－1 N2(g)+O2(g)="2NO" (g) H =+180kJ·mol－1则2CO(g)+2NO(g)=N2(g)+2CO2(g)的H是
| A．－386 kJ·mol－1 | B．＋386 kJ·mol－1 |
| C．－746 kJ·mol－1 | D．＋746 kJ·mol－1 |
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