已知： C(s)+1／2 O₂(g_)=CO(g)；△H₁=" -110.35" kJ／mol
CO(g)+1／2 O₂(g)=CO₂(g)；△H₂=" -282.57" kJ／mol
则：C(s)+O₂(g)=CO₂(g)；△H₃=

A．+172.22 kJ／mol	B．-172.22 kJ／mol
C．+392.92 kJ／mol	D．-392.92 kJ／mol