I.CO2(g)+3H2(g)⇌CH3OH(g)+H2O(g) ΔH1=-49kJ·mol-1
II.CO2(g)+H2(g)⇌CO(g)+H2O(g) ΔH2=+41kJ·mol-1
III.CO(g)+2H2(g)⇌CH3OH(g) ΔH3
回答下列问题: