A:2O3(g)=3O2(g) ΔH<0
B:(NH4)2CO3(s)=NH4HCO3(s) + NH3(g) ΔH>0
C:2CO(g)=2C(s) + O2(g) ΔH>0
D:3Fe(s)+2O2(g)=Fe3O4(s) ΔH<0
关于力学单位制下列说法中正确的是( )
I was tired out, so I stopped the car a short rest.