①CO2(g)+2H2O(l) === CH3OH(g)+ O2(g) ΔH1=+764.5 kJ·mol-1
②CO(g)+ O2(g)===CO2(g) ΔH2=-283.0 kJ·mol-1
③H2(g)+ O2(g)===H2O(l) ΔH3=-285.8 kJ·mol-1
下列有关说法正确的是( )
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