I.CO(g)+H2O(g)⇌CO2(g)+H2(g) ΔH1=-41.0kJ·mol-1
II.CO(g)+2H2(g)⇌CH3OH(g) ΔH2=-90.0kJ·mol-1
III.CO2(g)+3H2(g)⇌CH3OH(g)+H2O(g) ΔH3